Press fittings for metal plastic pipes types, labeling, purpose example of installation work

The proper insulation and heating techniques are essential to maintaining a warm and energy-efficient home. The plumbing system in your home that distributes hot water is one component that is frequently disregarded in this process. Because of their flexibility and longevity, metal plastic pipes are frequently utilized for this kind of application. However, how can one make sure that these pipes are installed effectively and safely? Press fittings become relevant in this situation.

Press fittings are creative solutions that simplify and improve the dependability of installing metal and plastic pipes. These fittings are made to join pipes securely without the mess and welding involved in soldering or welding. Instead, they ensure a leak-proof connection by using a hydraulic press to create a tight seal between the pipe and fitting.

Press fittings come in a variety of varieties, each intended for use with particular pipe diameters and functions. Every component of your pipe system has a fitting, from elbows and tees to straight couplings. Furthermore, press fittings are available in a variety of materials, such as brass, stainless steel, and copper, so you can select the one that best suits your requirements.

It’s crucial to comprehend press fitting labeling to make sure you choose the appropriate fittings for your project. Typically, labels provide details about the fitting’s material, size, and suitability for various pipe kinds. You can guarantee a seamless installation procedure and steer clear of compatibility problems by closely reading and interpreting these labels.

Let us now examine an illustration of the practical application of press fittings in an installation project. Consider that you need to install a new heating system in your home as part of renovations. You selected metal plastic pipes because of their affordability and robustness. Press fittings allow you to connect pipes fast and safely without the need for specialized equipment or knowledge.

Press Fitting Type	Labeling
Straight Coupling	PP-R
Reducing Coupling	PP-R
Elbow Fitting	PP-R
Tee Fitting	PP-R
Ball Valve	PP-R

How to connect polypropylene pipes with metal-plastic pipes

How to join metal-plastic pipeswith polypropylene pipes

It is not possible to directly connect plastic with metal-plastic pipes; in my experience, the fittings and connectors used to transition from plastic to metal-plastic pipe do not match.

Some fasten with solder, some with screws, and some with clamps:

As a result, the thread will be used to connect them. For instance, an external fitting on a polypropylene pipe can be soldered, and an internal thread of the proper diameter can be found on a metal-plastic pipe clamp.

In the event that turning the pipe is not an option, the transition must be made using an American-style flat connection or coupling nut.

However, the connection’s purpose is to reach the thread, which will link various types of pipes!

The idea behind the connection is this: you need to locate two fittings, one for a polypropylene pipe and the other for a metal-plastic pipe. The crucial thing is that both fittings have the same threads; the only distinction is that one fitting needs to have an internal connection type called "mom," and the other should have an external connection type called "dad."

With the exception that it will be difficult to disconnect the pipes at this point because they will be standing firm in this situation. Installing a compression fitting is essential to stop this from happening because it not only evens out the pipe’s physical variations but also allows for a fast disconnect if needed.

Fittings are used to join pipes; these connections are known as PXushkami. This product is made of plastic and has a thread on the end that can be either internal (for "mom") or external (for "dad").

In addition to straight PRX, there are also angled PRKhushki and tees with threaded outlets.

These metal-plastic pipe connections have threads that are screwed on.

I typically combine, so to speak, hemp and fom tape (also known as tape fum) when wrapping on the threads. There is greater dependability in the connection.

There is an alternative connection option called "American." "American" is nearly identical to the PRX, but it is a collapsible connection, which is sometimes necessary (the last joint, or the requirement to remove the entire assembly on a regular basis).

Metal pipe fittings for metapol are used to connect pipes.

Fittings are such products that have threads on the external or internal side.

These "tzatzeka" come in a vast assortment; they are angled, straight, curved, and have multiple pipes connected to them. They also come in various diameters:

How are metal-plastic pipes and polypropylene pipes connected?

A polypropylene pipe fitting with the same thread as the metapol fitting, either internal or external, is also required. These two distinct fitting types for various pipes are linked to one another.

Features of the connection of sewer pipes

The connection of a cast iron pipe with a plastic pipe during the installation of a sewerage system is frequently required. This connection differs structurally from that of steel and plastic pipes. Certain connections require specific accessories.

Transition collar made of plastic and cast iron

Choosing and buying components is usually not difficult. Simultaneously, if an appropriate sealant is not available, the issue can be resolved using homemade materials. One way to obtain the necessary size seal is by cutting microporous rubber, such as that found in an old car mat. Using a blunt, wide screwdriver, a long, narrow strip is inserted into the space between the components that need to be joined and sealed. Excessive force is avoided when sealing to prevent damage to the plastic. Further sealing of the joint may be necessary if a leak is found during a system test fill.

It is not appropriate to use cement mortar or chasing to seal the connection.

• When chasing plastic plastic plastic pipe deforms, the joint will not be tight, there is a high probability of leakage.
• Cement mortar will not last long. Due to the large difference between the coefficients of thermal expansion of materials, the joint will loosen every time hot water is drained. In the near future, the cemented joint of plastic and cast-iron sections of the pipeline will get cracks and will cease to be airtight.

Although connecting plastic pipes to copper pipes is incredibly uncommon, fittings specifically designed for these connections are available for purchase. They have two smooth couplings: one to connect to the plastic pipe and the other to solder the copper pipe.

Joining metal to metal-plastic

As numerous real-world examples demonstrate, it is occasionally necessary to combine components made of two distinct materials or substances in order to replace or renovate a plumbing part.

In these situations, it’s critical to take your time and follow a precise plan of action for each step. It is permitted to follow a number of helpful suggestions.

The most common tool used for this kind of work is a crimping fitting, which joins pipes. To accomplish this, you must adhere precisely to the directions and guidelines given in the carefully crafted instructions:

1. First, screw the fitting onto the metal pipe using a socket wrench. It is recommended to clean it from dirt, dust and rust beforehand. After that, the part is treated with soap and paint in order to protect it from leakage.
2. While the paint is drying it is possible to start working with metal plastic. It is necessary to carry out calibration, but before that put on a press washer.
3. The end of the metal-plastic pipe should be attached to the cone, which is fixed on the metal object.
4. At the end, the nut must be screwed on tightly.

Fittings and their varieties

Depending on the type of connector, there are different ways to connect metal and plastic pipes.

Fitting comes in a variety of forms, the most widely used being:

Compression connector (Fig. 2)

Utilizing compression fittings for connection is affordable, straightforward, and reusable. The connected elements can only be placed in locations that are easily accessible, which results in a significant time wastage during the work process. Additionally, the connection points require periodic checks.

The following order is followed during the connection process:

• Alignment of the product is carried out with the calculation of 10cm before and after the cut.
• The required length is cut at right angles.
• Pipes from the end are cleaned with a reamer, the calibrator removes the entry chamfers of 1 mm.
• The nut, then the split ring is put on the product.
• The fitting is moistened.
• The product is put on the socket, it must fit to the fitting. The union nut is screwed on to the end. The wrench fixes the nut, but in no case it is impossible to overdo it, so that the thread is not torn off.

Press-fitting connector (Fig. 3)

A very dependable kind of connection that can be installed beneath the floor and in concrete walls with confidence. The element is not replaceable and can only be disassembled with a portion of the product, which is a drawback. Additionally, specialized tools are required. It is not a task that is simple enough to complete with your hands and no prior experience.

The following order is followed during the connection process:

• The length of the pipe is cut off.
• The internal chamfer is removed with a calibrator.
• The external chamfer is removed with a chamfer remover.
• The calibrator helps to check the diameter from the inside.
• The sleeve is removed from the fitting to check the fitting ring and its gasket.
• The sleeve is inserted back into its place after checking.
• The pipe should be inserted into the fitting up to the stop, it should be visible through the opening of the sleeve.
• The sleeve is inserted into the fitting connector, the connection is passed through to the stop.

3 Press-fitting connectors, rice

Push-fitting connector (Fig. 4)

There are several benefits to this kind of connection for plumbing structures:

• self-installation is possible, as no serious construction tools are needed;
• installation is carried out in a short time;
• The construction can be hidden in a concrete wall or under the floor.

The drawbacks consist of:

• high cost of the element;
• At least three hours the joint of the part should be held (the sealant during this time takes the desired shape on the radius of the pipe).

The following order is followed when completing the connection process:

• The pipes are cut to the required length.
• Using a calibrator, it is used to chamfer the ends, creating a perfect hole.
• Push fitting is put on the prepared product, inserting it as far as it will go.
• Another product is inserted from the opposite side of the fitting (connector).
• The two products are secured with a push-fitting.

Connection of polypropylene and metal-plastic pipes with metal pipes how to do it

Dorokhov, Nikolay How can pipes made of different materials be connected to one another, such as metal-plastic or polypropylene pipes to metal pipes? Metal pipes are gradually disappearing from use. They have been replaced by sturdy and dependable metal plastic and polypropylene products. Nonetheless, connecting polypropylene or metal-plastic pipes to metal pipes might be required during the building, upgrading, or maintenance of current water pipelines. How can pipes composed of various materials be connected?

In which cases it is necessary to connect to metal pipes?

During construction projects, situations involving the joint of pipes made of different materials occur frequently. The most common situations consist of:

• connection of plastic pipes to metal parts of the equipment;
• execution of different sections of communications by different organizations without coordination in the choice of one type of material;
• replacing only the rotten part of the pipe with another, more modern material;
• repair work within one apartment with the replacement of pipes and their connection to the old system of neighbors.

Changing out a section of the water pipe

What types of connections are there?

There are only two ways to connect pipes made of different materials:

• threaded – using a variety of fittings, used for joining pipes of medium or small diameter rather than large diameter;

• flanged – this type of connection is collapsible, used for large-diameter pipes, made with flanges.

Take note! Prior to connecting the pipes, the surfaces of both of these methods must be meticulously prepared. The longevity of the entire system and the tightness of the connection itself are dependent upon it.

Threaded connection with fittings

Fittings are adapters with an internal or external thread on one side for attaching to a metal element. Depending on the material, a socket on the second side can be used to connect to metal, plastic, or polypropylene by soldering or crimping. The system installation is not overly difficult:

1. The socket on the metal pipe at the connection point is unscrewed and the thread is cleaned. Or a piece is cut off neatly and evenly and threaded using a special tool.
2. To seal the joint along the threads, a bit of sanitary tape or hemp is wrapped around the thread, and all this is lubricated with silicone compound.

Linkage with fixtures

Using the threaded portion of the fitting, screw it onto the metal pipe. Carefully, and with a tiny tightening, this is done. It is preferable to tighten the fitting further after testing the system and ensuring that the joint is tight. Place the plastic pipe in the fitting on the opposite side. If it’s polypropylene, weld it together using a specialized machine. A metal-plastic pipe’s connection is tightened when using it. A unique tool called a "press"—a pair of pliers—is used to join a metal-plastic pipe using a press fitting.

A fitting must be screwed onto a metal pipe manually, without the use of tools or a lot of force. Fittings are a fairly delicate product; if they are forcefully screwed on, they may break.

Flanged pipe connection

Flanges are frequently used to join plastic and metal pipes. Prior to beginning work, the elements that are required are chosen based on their size and type in relation to the pipe diameter. The end product is a collapsible structure that can be disconnected to allow access to any location if needed. Before beginning any work, flanges are thoroughly examined for burrs, which can harm plastic pipe, and are removed as needed.

Similar to the threaded connection, this one’s technology is likewise not very complex:

• The pipe in the place of the intended joint is neatly and evenly cut;
• The flange is put on the pipe, then a rubber gasket is installed;

Pipe flange connection

• the flange is carefully slid over this gasket;
• The flanges of one and the other pipe are fastened together with bolts, which must be screwed without excessive effort, evenly and without displacement of the part.

These two approaches to joining pipes made of various materials are trustworthy and long-lasting. There is not much complexity to the installation procedure. All that is required to complete the task correctly is to pay close attention to each step, adhere to the directions, and act cautiously.

Replacing a section of pipe: video

Basic rules of installation

• When laying outdoor piping, it is important to fix the pipes on the base. But, how to fix metal-plastic pipes to the wall? Special plastic clips should be used for this purpose.

Advice: Make sure the fastening is flexible. Since metal-plastic pipes expand with heat, it is possible for them to collapse if they are fixed rigidly.

• Do not squeeze the pipes when making fastenings.
• When performing concealed wiring, it is mandatory to perform a pressure test at the maximum working pressure after the installation is completed. In addition, experts recommend testing at twice the working pressure.
• It is not recommended to use connections with compression fittings when making wiring that is buried in a concrete screed. When using this type of connection, you can hide the wiring with removable boxes or boxes equipped with hatches at the joints.
• It is possible to carry out the installation of pipes at a temperature of at least 10 degrees Celsius of heat. If the pipes were stored at sub-zero temperatures, they should be allowed to rest in the heat for at least a day.

Methods of bending pipes

Apart from the connection, it’s crucial to follow the right technology when bending metal-plastic components.

There are four methods in all:

1. By hand. In this case, special care should be taken so that a defect does not form at the bend point, which will lead to obstruction of the pipeline.
2. By means of a spring. This tool is sold in construction stores. The spring is inserted inside, after which the bending is done.
3. Using a hair dryer. Under the influence of hot air metal plastic is easier to bend. But it must be handled with care, otherwise there is a risk of melting the material.
4. Using a special pipe bender. This is a professional tool that will help to correctly and effortlessly bend a part of any size.

Features of the use of press jaws

Press jaws are a very useful tool, but there are situations where using one is extremely inconvenient. Experts in the restoration and installation industry advise using a press gun instead of pliers when working with grooves installed in false walls or beneath suspended ceilings. Accidents are totally avoided, and one hand can be used to operate the process.

With the help of the press gun, a handy modern tool, you can crimp pipe material in tight spaces and at the most awkward locations. But given how much it costs, purchasing it for a one-time home assignment is not reasonable.

Furthermore, the apparatus has the ability to be turned around the pipes’ joint axis, enabling accurate, dependable, and smooth pressing.

Ways of making connections

Sewerage

In this instance, joining polyethylene to metal pipe is a fairly straightforward process. Special factory-made gaskets, corrugations, or cuffs are always available in retail stores, and a wide variety of sizes are available.

However, you should not use chasing or cement to seal the transition from metal to polypropylene pipe (see "Methods for connecting polypropylene pipe to metal pipe: advantages and disadvantages of approaches"). The soft polymer pipe will eventually distort if you use coining, making it impossible to make a tight connection.

The issue is a little different when it comes to cement mortar. Due to the high temperature instability of plastics, the putty will eventually deform as a result of the pipes’ inevitable expansion during operation. Similar outcomes are obtained: no perfect connection.

If you are unable to locate an appropriate sealant, you can use microporous rubber—the kind used, for instance, on car mats. To seal the connection, all that needs to be done is cut off a piece of the material and use a blunt-ended screwdriver. But keep in mind that plastic is brittle.

Water supply and heating system

There are two possible methods to join an iron pipe to a plastic pipe, depending on the cross-section of the pipes:

• If you have at your disposal pipes with a cross-section of up to 40 mm, then the transition from steel pipe to polypropylene can be made with the help of a threaded connection on a section of metal. It is easy enough to purchase the appropriate fittings, equipped with a coupling for the polymer pipe on one side, and on the other side – threads. To get a tight threaded joint, you can use linen with olive oil or paint.
• If we are talking about dissimilar pipes with large diameters, then the optimal connection will be the connection of metal pipe with plastic pipe without threads, that is, flange connection. The reason for this approach is the fact that it is impossible to screw a 60 cm thread using hand tools. Numerous adapters are available on the market that can be used to connect metal pipe to plastic pipe without threads.

It is important to remember that installing pipelines that combine pipes with different cross-sections and multiple materials is frequently required. The most practical and widely accepted method in these situations will be the threadless connection of metal and plastic pipes.

Features of the manual pipe press

Hand pliers that are hydraulic or mechanical can be used to crimp metal-plastic products. The crimping head of the first kind of tool is attached to two handles via a gear mechanism. The fitting sleeve is squeezed when they compress because the force is transferred to the head.

There are numerous attachment options available for manual pliers.

The operator’s job is made easier by the adjustable handle length of these press jaws for metal-plastic pipes. The mechanical tool needs physical labor but is less expensive and has a simpler structure.

One of the handles of hydraulic press pliers for metal-plastic pipes has a hydraulic cylinder. The crimping head is mechanically attached to its output rod. A piston is forced into the hydraulic cylinder when the handles are brought together, creating pressure that is then transferred to the head. While less effort is needed while working, this raises the tool’s cost and necessitates ongoing maintenance.

Step-by-step joining instructions

How to connect pvc pipe with metal pipe

Attach metal and plastic pipes in the order listed below:

• Choose the method of connection;
• Measure the inner and outer diameter of the connected products;
• Buy all the appropriate fittings (pay special attention to the type of thread – internal or external ;
• Mark the markings on the pipe;
• Cut the edge of the plastic pipe as evenly as possible and clean the metal pipe, if necessary – cut off the old thread and apply a new one;
• Place a sealing gasket on the metal part;
• Screw the necessary fitting to it, or attach the flange;
• In the case of a flange connection, push the flange against the gasket and connect it to the other flange with studs or bolts;
• In case of threaded connection – the metal part is cleaned, apply a sealant or fum tape, screw the fitting by hand, the edge of the plastic pipe is installed in the mating part, if necessary, it is welded;
• Check the connection for tightness.

How to connect a metal pipe to a metal-plastic pipe

Using a crimp fitting to join metal to plastic is the best option. Actions taken in order, step by step:

• Remove rust and dirt from the steel threads;
• We apply a layer of insulation (hemp, fumed tape);
• Screw the fitting onto the metal pipe with a horn or gas wrench;
• Put the press washer together with the nut on the edge of the metal-plastic pipe and calibrate it;
• Place the end of the metal-plastic pipe on the metal fitting screwed to the metal fitting;
• Use a wrench to tighten the crimp nut tightly.

How to change from a metal pipe without threads to a plastic one

Sometimes a plastic pipe has to be attached to a threadless metal component. Here, you have two choices: either apply the thread yourself or use the crimping sleeve for threadless connections that was previously mentioned.

For self-threading, a unique threading tool (thread cutter) is needed. Mechanical and electric versions are available for purchase. The electric version comes with a number of cutters for pipes with varying diameters. Compared to a mechanical one, this model is lighter and more convenient, but it costs significantly more.

Although manual tools are less expensive, using them calls for a high degree of physical stamina and expertise.

Guidelines for using a slitter:

• The tool should not be used when the pipe is located close to the walls;
• When working with a manual machine, you should clearly observe the order of movements – half a turn forward, then – a quarter back, and so along the entire length of the thread;
• Electric tools heat up quickly and need to rest periodically;
• Before threading, the metal must be cleaned;
• The resulting thread grooves should be lubricated with solidol or other grease

3 Assembling the system with crimp couplings is simple and reliable

Collet fasteners are not as reliable as crimp sleeves when it comes to maximizing pipe connection reliability. They are typically mounted on the mains, which must be concealed in the wall or beneath the floor. Flush mounting is not a suitable application for compression products!

Using specialized press jaws, the couplings are crimped.

Brass or steel are used to make crimping couplings. They’re quite simple to use. It is necessary to enlarge the metal-plastic pipe’s end. It is advised to use a specialized expander for this procedure. Next, fit the fitting into the larger hole and remove the gasket (which is part of the fastener set) that has dielectric qualities on it. After inserting the socket into the pipe, the coupling can be slid on and tightened into position. Press jaws, which come with a variety of cross-sectional nozzles and are available for purchase in building stores, handle the final portion of the operation. The cross-section of the pipes that need to be installed must match the nozzle’s diameter.

Crimping of the coupling can also be carried out using a special power tool. But its cost is significantly higher than the price of ordinary press jaws. At the same time the efficiency of crimping in both cases will be approximately the same. Consider whether it is necessary to spend money on expensive electrical equipment, if the work can be easily done with a hand tool. After crimping, the surface of the socket takes on an arc-shaped appearance with two circular parallel stripes. It should be added that the described products are used only once. In addition, their crimping with press jaws can also be performed only once. If you fail to clamp the coupling the first time, you will have to install new fasteners.

System of metal-plastic pipes how to connect it with a metal segment

A special coupling with a threaded connection must be used when connecting to the outputs of the water heating boiler or to an existing system that is built on metal pipes. The coupling is first mounted directly onto the system’s metal component and is reinforced with a threaded connection.

When joining metal and metal-plastic pipes, a bead of gauze is used to seal the joint.

Paint and soap are the traditional two-component bond used as a sealant. The metal pipe is wrapped with a thin layer of paint-impregnated soap along its threads. Subsequently, the connecting sleeve is tightened. The metal plastic pipe is mounted on the opposite side of the fitting once the paint has dried, which takes some time. The fitting’s mating component may use a sliding washer or a press-coupling.

Installation of metal-plastic pipes for plumbing with your own hands

Installing metal-plastic pipes could be required when setting up a water heating system, installing a new water pipeline, replacing an outdated pipeline, or expanding the pipework and wiring.

It is possible to install a metal-plastic water pipe by hand.

There are currently the following techniques for installing pipelines:

• With the help of welding;
• With the help of special fittings;
• Connection to flanges.

Welding is one of the most challenging and time-consuming ways to join metal-plastic pipes because it must be done in multiple seams.

With the use of fittings, connecting pipes is made easier and faster than ever before.

Fittings can be threaded, crimped, flanged, or welded depending on how the pipes are attached. There are numerous sizes, forms, and varieties of fittings. However, what unites them all is that they enable the fast and dependable connection of one pipe to another.

Additionally, there are fixtures with a faucet that let you turn off the water. Because of their bulky appearance, flanged water pipe assemblies are rarely used in residential settings.

Choice of jointing method

Fittings are used to connect various polymer parts, including metal plastic pipes. The type of fittings you bought will determine how they are assembled.

Let’s take a closer look at each of them.

Method 1. Compression fittings

In this instance, brass crimp fittings are used to make connections for metal-plastic pipes. They are also known as the Collet Connection.

One of the benefits of this kind of jointing is that it eliminates the need for you to buy any extra tools or equipment for the task. It takes two wrenches to properly screw on the crimp nuts.

There are three parts to the fitting:

• fittings;
• split ring;
• coupling nut.

Take note: Compression fitting connections between metal and plastic pipes are disassembled. If required, you can take the plumbing system apart and put it back together after making the required adjustments or additions.

Diagrammatic schematic of the compression fitting apparatus

The installation guidelines are very straightforward:

1. A section of the required length is separated from the metal-plastic part. The workpiece should be straight at a distance of at least 10 centimeters from the cut-off piece.
2. Cutting is carried out with special compression shears or a metal hacksaw. In the latter case, the edge will need to be deburred. Remember that the cut should be made strictly at right angles, otherwise it will be problematic to achieve a tight joint.
3. Then a nut is put on the end (its thread should be directed towards the cut) and a sealing ring.
4. After that, the end of the part is processed with a special tool – a reamer:

• The calibration side is used to remove the inner chamfer (to a distance of about 1 mm);
• The other side of the reamer is used to remove the outer chamfer.

1. The connector is inserted into the metal-plastic part, then a seal is put on it and a nut is screwed on. First the work is done manually, then – with a wrench. Do not apply significant force to fixing, otherwise you can damage the material.

Procedure to be followed when attaching compression fittings to pipes

Method 2. Connections with compression fittings

Plumbing and floor heating systems are installed using this type of jointing. These metal-plastic pipe connectors are utilized in situations where the pipeline is buried beneath a layer of screed on the floor or within a concrete wall.

The joint is more dependable, but installing it calls for specialized knowledge and the availability of press jaws, a special tool.

The tasks are completed in the following order:

1. The end of the correctly cut pipe is processed with a reamer: the inner and outer chamfers are removed.
2. The internal diameter of the part is checked with a calibrator.
3. Before installing the fitting, make sure that a dielectric gasket and sealing rings are installed in it.
4. A crimp sleeve is put on the part, and the fitting socket with gaskets is inserted into the part.
5. The coupling is then crimped onto the pipe using press jaws. Make sure that the installed nozzles correspond to the diameter of the part on which the fitting is mounted.

Be aware that re-crimping the metal socket is not advised. It would be ideal if everything went together perfectly the first time; if not, there might be leaks and this unit would need to be disassembled.

Press fittings come in different varieties with a socket that is fixed firmly. In this instance, a window that has been specially provided is used to control the fitting’s depth.

Method 3. Jointing using overlapping couplings

The second and third methods of joining metal and plastic pipes are comparable; however, in the latter instance, an espander is used in addition to pliers to increase the internal diameter of the used part prior to installing the fitting socket.

It turns out that the connection is incredibly dependable, airtight, and unbreakable. used when installing underfloor heating systems that will have concrete mortar poured over them.

This is how the work is completed:

1. The pipe is cut and then the compression sleeve is placed on the pipe.
2. The end of the metal-plastic part is expanded with an expander, then the fitting is inserted into it.
3. The socket is crimped using a press.
4. A reliable and durable connection is ready.

Fittings with slip-on installation

Types of tools

Many versions of this equipment have been developed to make work easier.

Manual drive

The most common use for manual-drive crimping press pliers is as a clamping tool in domestic settings. Such equipment is distinct from others due to its reasonable cost and subtle modes of operation. The majority of this equipment includes detachable inserts for clamping pipes with diameters of ten, fifteen, and other millimeters, as well as a universal crimping head. Regarding clamps that have a forty millimeter diameter—no way. A diameter of thirty-two millimeters is the maximum allowed for the manual connector. Such equipment’s size and limited functionality are its main drawbacks, making connection procedures inconvenient at times.

There are various types of manual tools used in the installation of metal-plastic pipes.

Mechanical

Two handles and a gear mechanism connect the mechanical equipment to the head. The coupling with the fitting is compressed and the applied force is transferred to the head.

Telescopic handles are frequently used in the manual installation structure for pressing to aid in adjustment.

Hydraulic

Making a tool on your own with a hydraulic connection presents challenges. But it’s far easier with the hydraulic bender.

This inexperience isn’t always justified, though. Purchasing factory pliers Valtec or their equivalent, which is equally high-quality, is both safer and easier.

There are a few characteristics of hydraulic tongs that stand out.

• The tool has two handles, one of them is connected to a hydraulic cylinder.
• The output rod of the cylinder is mechanically connected to the crimping head.
• The second handle is connected to the cylinder piston.
• When the handles are squeezed, the piston enters the cylinder. This creates a pressure transmitted to the head through the output rod.
• Installation of the coupling and fitting is carried out with minimal effort. The price of this device is much higher than mechanical, and it needs maintenance.

Electrohydraulic version

Professional devices have an advantage in electric drive, or more accurately, electrohydraulic drive.

Small-sized electrohydraulic pliers are quite high-performing despite being extremely lightweight and easy to use. It makes connecting metal-plastic pipes easier; most of them have a diameter of 105 millimeters.

Electrohydraulic device models can be classified into multiple categories.

• Mains tool. To begin operation, the press jaws must be connected to a standard household outlet with a power of two hundred and twenty watts.
• Cordless. This device is fully autonomous, as it operates by means of built-in batteries.
• Universal. It is either self-contained or mains-powered, depending on the situation.

Superior electrohydraulic press jaws come with detachable universal heads that fit a particular diameter of plastic-metal pipes.

Should you possess a pipe bender and hand pliers, you can effortlessly arrange communications in your home, homestead, or apartment on your own. It will take some practice to operate this kind of device. But with a few tries, you’ll quickly pick up all the subtleties of using press jaws.

You will require a few additional devices in addition to the pipe that you purchased and the required fittings.

• Pipe cutter. Tool, similar to scissors, providing the correct cut – perpendicular to the pipe. What is important in the work.
• Calibrator/gauge – a device designed for metal-plastic pipes. When cutting the pipe, the pipe is flattened slightly and the edges are curved. The function of the calibrator is to restore the shape and align the edges of the metal-plastic pipe.
• Countersinker – a device created for chamfering. A construction knife and a piece of sandpaper may well be suitable. Quite often, calibrators have a chamfering tab, so you can get by without this tool.

Comparative characteristics of different pipes

Metal pipes

It’s important to note separately the rare instances in which copper is utilized in pipelines. The truth is that plumbing fittings cannot be installed on copper because it is too pliable and soft. The sole choice could be a copper elevator assembly, with polypropylene pipes handling the remaining distribution.

As a result, we won’t be considering copper products going forward.

It is well known that the primary factors influencing the high demand for metal products are their hardness and resistance to mechanical damage.

Furthermore, every type of metal pipe has unique qualities of its own:

• steel products – subject to overgrowth of the inner surface and corrosion;
• zinc-coated pipes – are characterized by resistance to corrosion, however, quite difficult to install;
• Stainless steel – such pipe rolls are characterized by high cost and are quite difficult to process;
• cast iron pipes – earlier brands were characterized by sufficient brittleness to impact, but cast iron BChSHG is quite strong (more details: "Characteristics of BChSHG pipes, features of production and use").

Pipes made of polymeric materials

It makes sense to separate plastic pipes in this instance into those composed of polyvinyl chloride, polypropylene, and polyethylene.

The following are the traits of each kind of product:

• polyvinyl chloride is a rather fragile material, so it is used for sewer pipes, although not often enough;
• Polyethylene – characterized by a low melting point (starting from 80 ℃), quite plastic and soft material, so it is advisable to use them only for cold water supply;
• Polypropylene – the most durable material, compared to other polymers, it is much lighter than others, so it can be successfully used for pipelines for hot water supply.

Types of connection of metal pipes with plastic pipes

These days, there are two methods for carrying out this process:

1. Threaded joint. It is used when connecting pipe products with a diameter not exceeding 40 mm.
2. Flange connection. Optimal with a large cross-section of pipes, as tightening the threads in such cases will require a lot of physical effort.

Features of threaded connections

Studying the fittings used for this purpose is necessary to comprehend how a plastic pipe is connected to a metal pipe with the aid of threads. Such a detail is actually an adapter. The fitting has a thread on the side that will be connected to the metal pipeline. The plastic pipe is soldered to a smooth coupling located on the other side. Fittings for bends and turns as well as models that can be used to connect disparate lines in larger quantities are also available for purchase.

The type of plastic pipe—soldered, crimped, or compression joints—determines which threaded coupling to use.

The steps listed below must be followed in order to connect a polypropylene pipe to a steel pipe:

• remove the coupling from the steel communication at the area of its intended connection to the plastic branch of the pipeline. You can also cut off a piece of the old pipe, apply solidol or oil and make a new thread with a thread cutter;
• Go over the thread with a rag, fix a layer of fum-tape or packet on top, cover the surface with silicone. On the thread, wind 1-2 turns so that the edges of the gasket go along their course;
• screw on the fitting. This operation with the adapter from plastic pipe to metal pipe should be performed without using a wrench. Otherwise, the product can crack. If a leak appears when you open the faucet, screw the adapter in again.

This part’s design simplifies the process of joining polypropylene pipes with metal pipes on bends and turns, which is a convenience. Fascinatingly, the fitting’s shape can be altered if needed. After heating it to +140˚C with a construction hair dryer, adjust this part to the necessary configuration.

Flange connection

Large-diameter plastic and metal pipes are connected in this manner, as was previously mentioned. The finished structure is foldable. Similar to utilizing a threaded adapter, the technology for joining plastic pipe with metal pipe without threads is the same.

• carefully and evenly cut the pipe at the intended connection point;
• put the flange on it and install a rubber gasket. It will act as a seal;
• carefully slide the flange over this sealing element;
• perform the same actions with the other pipe;
• bolt the two flanges together.

A flange connection is one way to go from metal to plastic; in this instance, the flange is soldered to the polymer pipe first.

Advice: Tighten the bolts uniformly, without moving the components and without using too much force.

Other methods of threadless connection of metal and plastic pipes

Flanges are not the only devices used to implement this technology; the following devices are also utilized:

Unique pairing. The place where building materials are sold has this part. Still, you can make it yourself if you have the right skills. The parts of this adapter are as follows:

• housings. It is best to make it from high-strength steel or cast iron;
• two nuts. They are located on both sides of the coupling. If you are going to make such an adapter with your own hands, for the production of nuts use bronze or brass;
• four metal washers. They are installed in the inner cavity of the coupling;
• rubber gaskets. They are used to seal the joint. It is not possible to specify their exact number in advance.

The cross-section of the pipe elements must match the diameter of the gaskets, washers, and nuts. Using such a coupling, connect a metal pipe to a plastic pipe without threads by following the steps listed below:

1. Insert the pipe ends through the nuts to the middle of the coupling. In addition, thread the pipe products through the gaskets and washers.
2. Tighten the nuts until they stop. The gaskets should be squeezed.

The bond is strong enough and long-lasting.

Making the connection with Gebo fittings is simple and quick; the key is selecting the appropriate diameter.

Gebo fitting. The components of this section are as follows:

• body;
• nuts;
• clamping rings;
• of the clamping rings;
• O-rings.

It’s a very easy connection.

1. Fully unscrew the coupling.
2. Put on the ends of the pipes to be connected all the above-mentioned elements.
3. Secure the joint with nuts.

How to perform a pressure test with a hand-held device

While not difficult, crimping a metal-plastic pipe with manual press jaws calls for caution and attention to detail. To position the pipe section, connecting fittings, and tool, an empty, level surface is necessary for the task.

The press jaws need the right conditions to operate correctly, which include a large, level surface and adequate lighting. Even a novice with little experience in repair and installation can make the necessary crimping and correctly install the fitting in a conveniently located location.

The press jaws are extended to the sides by 180 degrees and placed on the table once everything is ready. In order to insert the upper portion of the press insert into the cage, which matches the size of the pipe that is currently being processed, the upper element of the cage must be disconnected from the machine. The tool is snapped into place after the lower half is inserted into the empty lower portion of the cage.

The press jaws can only be used to crimp the fitting once. Since the second treatment is unquestionably inadmissible, each action must be handled carefully.

Assemble the pipe and fitting together and place the assembly into the press jaws, being careful to position the fitting sleeve inside the press insert.

The use of nozzles that clearly match the diameter of the pipe cross-section is crucial for high-quality crimping. If not, the apparatus will distort the fitting, necessitating the replacement of the component with a new one.

The handles are brought together to the stop and the crimping is completed once the set of pipe and fitting has been correctly inserted into the tool.

Two parallel arc-shaped bends and two distinct circular bands ought to form on the metal following the procedure. And the end result will be a fitting that is firmly and visibly installed and fixed, making it nearly impossible to remove with a homemade working tool.

The handles are brought together to the stop and the crimping is completed once the set of pipe and fitting has been correctly inserted into the apparatus. Two parallel arc-shaped bends and two distinct circular bands ought to form on the metal following the procedure. As a result, there will be a fitting that is firmly and clearly installed, making it nearly impossible to remove with a homemade working tool.

Fitting installation needs to be done meticulously, carefully, and without rushing. It is never appropriate to permit displacement to happen. The piping system will be severely harmed by even 5 millimeters, which could cause future integrity problems.

A loose, wobbly nut, a visible gap of more than one millimeter between the nut and the plastic pipe, and a loose nut are indicators of incorrect work. Should such mistakes be discovered, the fitting must be removed from the pipe and replaced with a new one.

How to bend a metal-plastic pipe

Installing plumbing requires more than just straight lines. It is inevitable to encounter turns when building a water supply system.

If you only need to reposition the plumbing a few times, you don’t really need to buy a pipe bender tool. This is accomplished manually with a 16 mm diameter pipe. Just a few guidelines that apply to all diameters must be followed.

Five pipe diameters or more should be the minimum bend radius. For instance, the minimum turning radius for a 20 mm pipe is 100 grams.

To execute the bend correctly on a diameter greater than 16 mm, you will need to use a special steel spring, which you can get almost anywhere that sells building supplies.

This is how the bend is formed. After being advanced to the bending point, the spring is placed inside the pipe cavity. A rope needs to be fastened to the spring if the bending needs to be done at a significant distance from the edge. This is necessary so that, once the bending process is finished, the spring can be extracted from the pipe.

A strong neodymium magnet that is in contact with the pipe and is guided to the bend’s location can also be used to extend the spring a significant distance. The pipe should be bent by hand once the spring’s center lines up with the desired bend’s center. Then, with the rope’s assistance, the spring is extracted.

If a large-diameter metal plastic pipe needs to be bent, add one more spring using the previously described method. This spring should be placed on the outside and led to the center of the bend.

Sand or salt can be used to bend metal plastic pipes. To achieve this, the pipeline cavity is filled with dry, calcined sand or salt, both ends are tightly sealed with plugs, and a bend is made where it is needed. The sand is taken out once the job is finished.

How to choose the right press jaws

Understanding the maximum diameter of the press jaws is essential when selecting them for working with metal and plastic pipes. The tool’s passport specifies these and other technical requirements. A set of inserts that can be used to crimp products with smaller cross-sections is installed in the press jaws.

When making a purchase, it’s critical to consider whether integrated systems for task optimization and control are present:

With its stepped clamp system, OPS maximizes and increases the force used. When crimping, the load on the sleeve will be distributed evenly thanks to ARS. Work is made easier by this sophisticated system because the amount of effort required is directly correlated with the fitting’s size. When using OPS, the crimping process doesn’t stop until the sleeve is fully pressed. The establishment of an airtight connection is managed by this system independently.

Press jaws with an hydraulic drive ought to be utilized for pipes up to 3.2 centimeters in diameter.

The majority of manual press jaws are made to crimp pipes up to 2.6 centimeters in cross-section. You can work with products up to 3.2 cm in diameter with reinforced mechanical and hydraulic manual models.

The most costly machinery is made by German and Belgian companies, but press jaws made in Turkey or Italy can be found to be fairly functional and reasonably priced.

Differences from compression analogs

Plastic press fittings can be confused with compression fittings due to inexperience and lack of knowledge about all the subtleties involved in installing pipes made of metal. They also feature a sleeve and a socket. The only way to crimp the latter is using a coupling nut that is part of the design rather than a tool.

The different type of connection that results from assembly is the primary distinction between these parts. If necessary, the compression version can be disassembled, but the pressed version cannot. The only way to swap out the press fitting for a new one is to cut it off the pipe.

The maintenance-free press fitting must be fully removed, but the compression fitting’s nut can be tightened if a leak appears at the connection point.

That being said, there is very little chance that a leak will occur in the press connection. It’s not by accident that this installation technique is advised for pipeline embedding in walls and underfloor heating beneath screed. In the practice of plumbers, cases where such fittings start to leak in concrete are extremely rare. This is more of an anomaly than the norm.

However, the installation of both kinds of press fittings calls for specific instruments. Additionally, all you need is a pair of wrenches to tighten the compression nuts. Therefore, "expensive tools + higher reliability of the joint" is on one end of the scale and "no unnecessary expenses + slightly higher risk of leaks" is on the other. Only the craftsman and the owner of the home where the piping is installed have an option in this situation.

Reasons for using dissimilar materials

Builders typically attempt to use a single material for the installation of water, sewer, and other systems. Nevertheless, there are situations where combined designs are necessary. The following are the most frequent causes.

Planned replacement and emergency maintenance. Cast-iron communications, outfitted with homes constructed several decades ago, are progressively deteriorating. Metal components corrode or clog with time and need to be replaced on a regular or emergency basis.

It makes sense that polymer pipes, which are more affordable and simple to install, would take the place of the outdated cast iron or steel pipes in this instance.

Riser connections to contemporary polymer pipes are frequently found in older homes with long-laid connections to metal (typically cast iron).

Construction: The installation of water supply, sewage, and heating pipes is a part of building a house, whether it is done privately or publicly. Many times, different organizations install different systems, and as a result of their disorganized work, numerous types of pipes—both metal and plastic—are delivered to the construction site.

Unique situations. Combining disparate materials is sometimes absolutely necessary, as in:

• connection of pipelines to process equipment, the high temperature of which cannot be withstood by fusible plastic products;
• Laying the main line in areas subjected to high loads, for example, under busy roads or at the exit from the garage. In this case, in difficult areas are laid more durable metal elements, and on the rest – polymer ones.

As we can see, it’s common to need to combine various pipe types.

We will delve into the world of press fittings for metal-plastic pipes in this article. These fixtures are necessary for effective insulation and heating systems in residential buildings. We will simplify the types, labels, and uses of these fittings so that you can easily comprehend their function. You’ll learn how these fittings are actually used in practice with the help of well-defined installation work examples. This guide will improve your knowledge of home insulation and heating systems and help you navigate the world of press fittings, whether you’re a professional in the field or a homeowner.

Stages of work

Phases of the fitting installation project

Work needs to be done according to safety regulations and with the utmost care at every stage.

• The first thing to do is to measure and cut the pipes to be connected according to their size. To cut such pipes, special cutters are used. To bring them into working position, the handles are pulled apart as much as possible. Then, making squeezing movements with the handles, it is necessary to cut the pipe in the desired place, then slightly turn it and continue cutting. By gradually turning the pipe, it should be cut off completely.
• Next, the pipe must be calibrated. The fact is that when cutting it most often acquires an oval shape, and a special calibrator eliminates this defect. The device is inserted inside the pipe and by means of rotating movements aligns the pipe end to a round shape. At the same time, the internal chamfer is removed from the pipe. This action is necessary so that the connection fitting can be inserted into the pipe as easily as possible and the rubber seals are not damaged.
• After the above work, a crimping sleeve is put on the pipe. It resembles a wide washer and comes complete with a fitting.
• Then the main part of the connecting element – the socket – is inserted into the pipe. It is necessary to make sure that all rubber gaskets, which are provided by its design, are in place. Also do not forget about the presence of a special sealing ring. Speaking of which, it is necessary not only as an additional sealant, but also to ensure that the metal of the connector and the metal mesh that is part of the pipe do not come into contact and do not corrode.
• When the place of connection is ready, you can proceed to direct crimping. Special tools should be used for its implementation. It can be electric or mechanical press jaws. Power tools of this type can be found only in specialized organizations, so that the description of their work is not appropriate, but mechanical press jaws – a tool more common and recommended for use at home. To bring it into working condition, the handles must be pulled apart by 180 degrees, then open the working crimping head, in which you need to insert special sealing sleeves corresponding to the diameter of the pipe. After that the tool is placed over the joint and by compressing the handles the connecting sleeve is crimped around the pipe and the socket inserted into it. The handles are then pulled apart and the press jaws are removed.

The manipulations described result in a tight, strong, and airtight connection. The approach is both universal and simple to use. It can be applied to pipes that are not intended to protrude and are intended to be hidden locations. These kinds of connecting fittings can be used for a fair number of tasks and are available in a range of shapes and configurations.

Connection of metal-plastic and polypropylene pipe

Joining polypropylene and metal-plastic pipes

The only way to join these two pipeline elements—which are composed of different materials—is with a threaded connection. In other words, a nipple will be provided for the metal-plastic product, and a combined coupling with the required threads will be provided for the polypropylene product. Soldering these pipe components together is not recommended. Watching a special training video will teach you more specific instructions.

Connection to metal products

You will need adapter fittings in order to use this method. After cutting the thread on the pipeline’s metal element, the usual procedures—which have already been covered in the upper subsections—are carried out. Special fittings are also used to make bends, branching, and diameter transitions.

This metal product technology is suitable for an open plumbing system configuration. When setting up concealed metal pipeline systems and heating systems, however, it is not advised to use it.

How to connect the elements of the pipeline with a faucet?

The largest selection of fittings, including tee fittings, fittings with thread sizes big enough to connect with a tap, bend, or other fittings, can be found on the shelves of specialty shops. suitable fittings that enable you to link the pipeline’s components and the valve. Any complexity of pipeline can be assembled thanks to the large selection of fittings available.

The primary techniques for connecting the pipe with different components have been covered. The outcome of installation work is entirely dependent upon your degree of effort as well as the caliber of the supplies and equipment.

What is metal plastic

The plumbing components composed of this substance are multilayered in structure. Aluminum foil is incorporated into the plastic to serve as an oxygen barrier and lower the coefficient of linear expansion.

Pipes with this design are called PEX-AL-PEX and go by the name metal-polymer. Decoded as polyethylene-aluminum-polyethylene, however a new variation of these water supply components, PE-RT-AL-PE-RT, just emerged not too long ago. Their manufacture involves the use of heat-resistant polyethylene. Additionally, connectors for metal-plastic pipes are used during installation work.

These products are essentially limitless in terms of their applications. They work just as well with systems that supply hot or cold water. Due to their widely dispersed nature, these elements are practically always incorporated into the water supply system of newly constructed objects. The only thing to figure out is the correct way to join plastic and metal pipes. This article has the solution for you.

The following are the main causes of metal-plastic pipe popularity:

1. Low cost, if compared to galvanized or made of stainless steel;
2. Ability to retain its shape when bending;
3. Possibility of use in open laying;
4. Durability;
5. Lack of wear and tear during operation;
6. Resistance to corrosion;
7. Good sound absorption capacity;
8. Chemical neutrality.

This product does, however, come with a few drawbacks. However, they fall short of the numerous benefits that set these pipes apart from other varieties, such as metal and plastic pipes.

Preparation stage

If metal-plastic pipes are selected for water pipe installation, the quantity of material needed to complete the task must be ascertained.

Coils of this kind of material are available in lengths ranging from fifty to two hundred meters. However, the store sells linear meters of metal-plastic pipe in any quantity. calculating the distance that the riser’s internal water pipe must travel.

You must measure the length of the wall from the riser to the intended location of the farthest faucet installation in your room because installation is done along the walls, just above floor level.

Next, add the height of the mounting holes on faucets, toilets, and washing machines from the floor to the resultant value. The total length will be obtained as a result.

It is important to note up front that the cost of any pipe connection goes up significantly.

Accurately calculating the total system length during the preparatory phase is crucial, as it is also a critical point for the system’s reliability.

Rounding the resultant value in meters to the nearest whole number upwards is required after the measurements are taken. The diameter should then be ascertained.

The outside diameter of metal plastic pipes ranges from 16 to 63 mm. The ideal diameter for plumbing installation inside a home is 20 mm. The "warm floor" system installation and branching from the main line to mixers and faucets are better suited for the 16 mm pipe.

The maximum diameter of this material is selected if a private home needs to have a water supply from the water supply network.

Your heating and insulation system’s longevity and efficiency can be greatly impacted by the fittings you choose for metal and plastic pipes. Press fittings provide a dependable and easy way to join pipes without the need for welding or soldering. Straight connectors, elbows, tees, reducers, and other types are readily available, so you can easily tailor your installation to meet your unique requirements.

To ensure compatibility and correct installation, it is essential to comprehend the labeling on press fittings. Specifications like material, size, and pressure rating are indicated on each fitting, so you can choose the right parts for the job. You can also make sure that the connection is safe and leak-free by being aware of the function of each fitting.

Press fittings for metal and plastic pipes can be used with ease and effectiveness, as seen in the example installation work. Assembling your insulation and heating system can be done quickly and effectively by using the right tools and adhering to manufacturer instructions. Press fittings provide an easy-to-use solution that reduces the possibility of mistakes and streamlines the installation process, regardless of whether you’re a professional installer or a do-it-yourself enthusiast.

In summary, press fittings offer a flexible and dependable solution for joining metal and plastic pipes in insulation and heating applications. They are the go-to option for many projects because of their versatility, ease of use, and obvious labeling. You can guarantee the long-term functionality of your insulation and heating system and expedite the installation process by taking advantage of press fittings.

Video on the topic

Installation of Valtec press fittings. Metal plastic pipe.

Pipe fittings. Installer"s Encyclopedia #1

Can press fittings for metal-plastic pipes be used in the installation of cross-linked polyethylene pipes??

How to install metal plastic pipes, fittings and press fittings! 👨‍🔧

How to Choose Fittings for Metal Plastic Pipes? Types with Sizes, Which are Better and Why?

Installation of VALTEC metal-plastic pipes and fittings