One must deal with the necessity of laying subterranean engineering communications multiple times when building their own home. This pertains to the domestic or storm sewers, the water supply, and occasionally the thermal line that must be laid between two buildings. It is crucial to shield the pipes from low temperatures to prevent the possibility of freezing during the winter months. Merely laying the pipes correctly and paying attention to their required slope is not enough.
Warming ground-level pipes
Warming underground pipes is particularly crucial in areas with severe winters, when the ground freezes down to a significant depth.
Surely, objections may be heard – why, they say, to insulate sewer drains, which is obviously given the corresponding slope, and stagnation of water cannot be by definition? But, meanwhile, thermal insulation of the sewage system is a very responsible business. There are at least two reasons that can cause accumulation of water in them – this is not a pumped septic tank or blocking of pipes on time. In both cases, in the other case, in an unmilled pipe, freezing of the liquid will lead to the formation of an ice cork and in the future – to the rupture of the walls. But to carry out a quick repair or replacement of the damaged area in conditions of frozen soil is an extremely complex and large -scale problem.
There are a lot of thermal insulation materials designed to insulate pipe sections that are underground. Their differences include those related to manufacturing, longevity, thickness, quality, and, of course, price.
- Criteria for choosing heater for pipes
- Materials used for insulation of underground pipelines
- Foamed polyethylene insulation
- Heater for pipes from polystyrene foam
- Pipe insulation – polyurethane foam
- Mineral wool
- What should be the thickness of the insulation layer of the underground section of the pipe?
- Calculator for accurate determination of the thickness of mineral wool insulation for pipes
- Video on the topic
- How to insulate the water supply? Strobores.
- Water pipe insulation in the ground
- How to choose pipes for water supply in the ground?
- Water insulation of water supply pipes from trench to house + heating cable
- DIY water insulation pipe.
- Warming of PND pipes, water supply in the basement: 1 part
Criteria for choosing heater for pipes
Certain requirements must be met by thermal insulators for pipes that pass a specific depth below the ground. These requirements include:
- Hydrophobic insulation, that is, its resistance to moisture. In addition to thermal insulation, the material should create a pipe protection from soil moisture without missing it, and without destroying and without losing its thermal insulation qualities.
- Low thermal conductivity for high -quality maintenance of natural heat inside pipes.
Actually, thermal insulation can serve two primary purposes in the given conditions:
Heat loss reduction is prioritized if the heat carrier (heating system) or hot water (hydraulic system) is pumped through the pipe.
– The primary purpose of insulation for sewage or cold water supply pipes is to prevent freezing and other adverse temperature changes.
According to the thickness of the heat-insulating layer (which has an average heat conductivity coefficient of 0.04 W/m × ° C) and the difference in temperature between the pumped fluid and the environment (ΔT °), the table shows the heat loss of pipes with varying diameters:
Thermal insulation thickness, mm | ΔT, OS | Pipe diameter in mm | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 150 | ||
Calculated thermal losses per 1 linear pipeline, vt. | |||||||||||
10 | 20 | 7.2 | 8.4 | 10 | 12 | 13.4 | 16.2 | 19 | 23 | 29 | 41 |
thirty | 10.7 | 12.6 | 15 | 18 | 20.2 | 24.4 | 29 | 34 | 43 | 61 | |
40 | 14.3 | 16.8 | 20 | 24 | 26.8 | 32.5 | 38 | 45 | 57 | 81 | |
60 | 21.5 | 25.2 | thirty | 36 | 40.2 | 48.7 | 58 | 68 | 86 | 122 | |
20 | 20 | 4.6 | 5.3 | 6.1 | 7.2 | 7.9 | 9.4 | eleven | 13 | 16 | 22 |
thirty | 6.8 | 7.9 | 9.1 | 10.8 | eleven.9 | 14.2 | 16 | 19 | 24 | 33 | |
40 | 9.1 | 10.6 | 12.2 | 14.4 | 15.8 | 18.8 | 22 | 25 | 32 | 44 | |
60 | 13.6 | 15.7 | 18.2 | 21.6 | 23.9 | 28.2 | 33 | 38 | 48 | 67 | |
thirty | 20 | 3.6 | 4.1 | 4.7 | 5.5 | 6 | 7 | 8 | 9 | eleven | 16 |
thirty | 5.4 | 6.1 | 7.1 | 8.2 | 9 | 10.6 | 12 | 14 | 17 | 24 | |
40 | 7.3 | 8.3 | 9.5 | 10.9 | 12 | 14 | 16 | 19 | 23 | 31 | |
60 | 10.9 | 12.4 | 14.2 | 16.4 | 18 | 21 | 24 | 28 | 34 | 47 | |
40 | 20 | 3.1 | 3.5 | 4 | 4.6 | 4.9 | 5.8 | 7 | 8 | 9 | 12 |
thirty | 4.7 | 5.3 | 6 | 6.8 | 7.4 | 8.6 | 10 | eleven | 14 | 19 | |
40 | 6.2 | 7.1 | 7.9 | 9.1 | 10 | eleven.5 | 13 | 15 | 18 | 25 | |
60 | 9.4 | 10.6 | 12 | 13.7 | 14.9 | 17.3 | 20 | 22 | 27 | 37 |
It is evident that as insulation thickness increases, heat loss naturally declines; however, total isolation remains unattainable even at 40 mm. In situations involving sewage or cold water supplies, you may need to take extra precautions, such as installing electric heating.
Below is a description of the insulation thickness needed for different kinds of pipelines.
- Resistance to external chemical influences – the soil is a very aggressive environment in this regard.
- The insulation should have high mechanical strength, be resistant to external mechanical and atmospheric influences, withstand loads and soil pressure. This also includes durability – since it will be difficult to replace thermal insulation in underground sites.
- Resistance to high and low temperatures of the environment and liquid transported through the insulated pipeline.
- The material should easily be mounted on a pipe in any position.
- An important factor is the compatibility of the materials of the insulation and the pipe, since the occurrence of the reaction between them is unacceptable – it can lead to mutual damage.
If all insulation material requirements are met, significant heat loss can be prevented, pipe integrity can be guaranteed, and the likelihood of ice traffic jams developing in pipes can be reduced.
Materials used for insulation of underground pipelines
In today’s building materials market, a decent variety of pipes are available. The most often used materials in their production are mineral wool of various kinds, foamed polyethylene, polyurethane foam, and polystyrene foam.
Materials are used as rolls, ribbons, mats, or in the shape of cylinders, semi-cylinders, segments, etc. for pipe insulation. Since profile insulations can be installed on pipes in any position, they are obviously the most convenient to install.
Foamed polyethylene insulation
When it comes to pipe insulation, foamed polyethylene has very high technical qualities. Additionally, this is reasonably priced.
Squadrons composed of polyethylene foam
- The thermal conductivity of the material is minimal, and is 0.035 W/m × ° C .
- This material has a structure consisting of the smallest closed cells that contribute to the creation of effective waterproofing, which is especially important for metal pipes. This gives additional protection against corrosion, extends the life of the pipeline.
- Foamed polyethylene can have a density of 25 ÷ 40 kg/m. As a rule, the most popular are products with this indicator of 30 ÷ 35 kg/m³.
- In addition, the material has excellent elasticity, which does not change even at critical negative temperatures (up to – 55 °). This quality makes the installation of insulation as a very simple matter – it is easy to cut the sleeve and put on a pipe located under any bend.
- The load on the gap that the foamed polyethylene can withstand is 0.3 MPa, and its dynamic elasticity is 0.76 MPa .
- The compression coefficient at a load of 4500 N/m² is 0.2.
- Vapor permeability – 0.001 mg/m × h × PA, that is, foamed polyethylene refers to materials supporting natural steam reproduction .
- The hydrophobicity of this insulation was checked by immersion in water for 24 hours, as a result of which the material absorbed moisture by only 1.3% of its volume . Moreover, it should be noted that in the following hours the absorption of moisture is completely stopped.
- Working temperatures of foamed polyethylene vary in the range from – 55 to + 85 degrees. Higher temperatures lead to its spatial deformation, and with negative values below the specified threshold, the insulation loses its elasticity, becomes fragile.
- Firewear in this case is not important, since insulated pipes will be in the ground. But this material is also used for external thermal insulation, therefore it has the appropriate classification, and according to this parameter, G2 is indicated, that is, moderately combustible material. Polyethylene is ignited at a temperature of 300 degrees and only with direct exposure to the flame. When burning, polyethylene decomposes into water and carbon dioxide, which is not toxic, and in small concentrations it is not dangerous for human health.
Molded polypropylene tube
This foamed polyethylene insulation comes in various thicknesses and is formed into 2000 mm-long cylinders, or sleeves. It adheres well to the surface of pipes made of various materials and cuts easily.
Foamerated polyethylene costs
foamed polyethylene insulation
We can determine that this foamed polyethylene is the most appropriate for thermal insulation of pipelines by contrasting the properties of their material with the insulation requirements.
You might be curious to know how much insulation is included in the pipe isoflex.
"Penophol" is another substance that is actively used to heat pipes. This is the same foamed polyethylene, but it has been enhanced by a reflective foil coating that improves the material’s ability to withstand heat.
Penophol in cylindrical form
Although "Penophol" is also produced in sleeves for pipeline insulation, some masters prefer to use the material in rolls. The first option is attached to the pipe using specialized tape. The overlap is wound on pipes that are mounted, and the second is cut into ribbons.
Ribbons made of foam to insulate pipes
Pentor costs
Penophol
Strip insulation is convenient because it allows the pipeline’s numerous bends and turns to be thermally oriented. The material’s elasticity allows it to take on the required shape and offer just the right amount of tightness for thermal insulation.
Slice through the insulating sleeve.
If sleeves or cylinders are used to warm pipeline that has already been installed, a section is made on them along the length of which they are worn on the pipes. Then, waterproof adhesive tape is used to secure this incision. Frequently, the manufacturer already provides such a cut.
Video: Comparison of some types of heater for pipes
Heater for pipes from polystyrene foam
Polystyrene foam pipe insulation is referred to as a "shell" because it closely resembles an egg shell. Such material has pros and cons of its own, so before deciding to stop using it, carefully consider its attributes.
Pipe insulation made of polystyrene
Pipe foam insulation is made up of two semi-cylinders (or, in the case of larger diameter pipes, three segments) joined by "PAZ-Ship" side locks. This allows you to completely isolate the pipeline from external influences while keeping the inside of the "shell" at a constant temperature. Installing insulation on existing highways is made simple by the way polystyrene foam is manufactured.
Different internal diameters of a shell
One or two meter long detachable pipes are used to create this type of heater. There may be variations in the external and internal diameters and wall thickness.
To produce "shell"-style pipe insulation, utilize PSB-C ÷ 15, PSB-C ÷ 25, and PSB-C ÷ 35. The following table lists the primary attributes:
The name of the parameters | PSB-S-15U | PSB-S-15 | PSB-S-25 | PSB-S-35 | PSB-S-50 |
---|---|---|---|---|---|
Density kg/m³ | to 10 | up to 15 | 15.1 ÷ 25 | 25.1 ÷ 35 | 35.1 ÷ 50 |
Compression strength at 10% linear deformation of MPa, no less | 0.05 | 0.06 | 0.08 | 0.16 | 0.2 |
The strength of the strength during bending, no less | 0.08 | 0.12 | 0.17 | 0.36 | 0.35 |
Thermal conductivity in a dry state at 25 ° C, W /(m × ° K) | 0.043 | 0.042 | 0.039 | 0.037 | 0.036 |
Water absorption in 24 hours, % in volume, no more. | 3 | 2 | 2 | 2 | 2 |
Humidity, % no more | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 |
The strength of the strength during bending, no less | to 10 | up to 15 | 15.1 ÷ 25 | 25.1 ÷ 35 | 35.1 ÷ 50 |
- Foam or polystyrene foam is a chemically inert, light material with the structure of closed cells not interconnected.
- The insulation has a low coefficient of the tzelnication, which is 0.037 ÷ 0.042 W/m².
- The moisture absorption of foam per day, as the tests showed, is up to 2% of the total volume of the material, so it can be called moisture resistant.
- The range of operating temperatures of the polystyrene foam is from – 50 to +75 ° C . In this limit, it does not deform and does not lose its main qualities.
- This material is resistant to the formation of foci of mold or fungus, does not rot, withstands the effects of alkalis, cement and gypsum solutions, salts and other inorganic substances.
The following characteristics of polystyrene insulation for pipes are advantageous:
- Low thermal conductivity.
- High moisture resistance, which allows you to maintain thermal insulation qualities of the material for many years.
- Simplicity of installation.
- Resistance to external environment.
- It is compatible with any material from which pipes are made, since it does not react with metal and plastic.
- The insulation has a fairly affordable price.
These kinds of insulation have the following drawbacks:
- The combustibility of the material – it is classified as g4. For underground sections, this criterion is not crucial.
- Polistyle foam is not elastic, and it will not be able to bend it, so they can only be insulated with even highways. And for turns you will have to select special corner parts.
- When using this insulation for pipes laid in the ground, it is recommended to additionally create protection for it, wrapping it with dense polyethylene.
By following the installation guidelines exactly, carefully applying the insulation shell to the pipes, and covering it with a waterproof coating, you can form a sealed insulation that protects the pipes from soil humidity as well as freezing.
Pipe insulation – polyurethane foam
There are currently ready-made solutions for water and sewer pipes that are already encased in a polyurethane foam thermal insulation layer and covered from above by a plastic or metal membrane. For instance, pipes with a metal shell that has been galvanized are used for highways that cross above ground, and polyethylene coating is a great option for pipelines that are buried because of its high level of moisture resistance.
Polyurethane-sealed pipe enclosed in a galvanized shell
These prefabricated insulated pipes are quickly replacing the thermal insulation made of mineral wool that was previously widely used. You should refer to the table that is shown below for a comparison.
The cost of polyurethane foam insulation
Heater polyurethane
Comparative features of mineral wool and polyurethane foam for pipe warming:
Material parameters | Unit | PPU | Minvata |
---|---|---|---|
Coefficient of thermal conductivity | W/ m × ° C | 0.033 | 0.049 |
Density | kg/m³ | 60 ÷ 80 | 55 ÷ 150 |
Compression strength | MPa | 0.3 | Not normalized, the resistance of the loads is minimal |
Water absorption, no more | % | 10 | Not normalized, moisture resistance is minimal, constant humidity laid in the calculation of 4% |
Effective service life, no more | years | 40 | 10 |
Operational costs (specific damage) | damage per year per 100 km of pipeline | 3 ÷ 4 | 30 ÷ 40 |
These pipes, which have an outer polyethylene shell and are insulated with polyurethane foam in compliance with GOST 30732 ÷ 200, have a diameter of at least 57 mm. There are the following types of releases available:
Pipes coated in polymer and insulated
External diameter of steel pipes, d, mm | Type 1 | Type 2 | ||||
---|---|---|---|---|---|---|
The outer diameter of the polyethylene shell, d, mm | PPU layer thickness, mm | The outer diameter of the polyethylene shell, d, mm | PPU layer thickness, mm | |||
nominal | maximum deviation (+) | nominal | maximum deviation (+) | |||
57 | 125 | 3.7 | 31.5 | 140 | 4.1 | 38.5 |
76 | 140 | 4.1 | 29 | 160 | 4.7 | 39 |
89 | 160 | 4.7 | 32.5 | 180 | 5.4 | 42.5 |
108 | 180 | 5.4 | 33 | 200 | 5.9 | 43 |
133 | 225 | 6.6 | 42.5 | 250 | 7.4 | 54.5 |
159 | 250 | 7.4 | 41.5 | 280 | 8.3 | 55.5 |
219 | 315 | 9.8 | 42 | 355 | 10.4 | 62 |
273 | 400 | eleven.7 | 57 | 450 | 13.2 | 81.5 |
325 | 450 | 13.2 | 55.5 | 500 | 14.6 | 79.5 |
426 | 560 | 16.3 | 58.2 | 630 | 16.3 | 92.5 |
530 | 710 | 20.4 | 78.9 | – | – | – |
630 | 800 | 23.4 | 72.5 | – | – | – |
720 | 900 | 26.3 | 76 | – | – | – |
820 | 1000 | 29.2 | 72.4 | 1100 | 32.1 | 122.5 |
920 | 1100 | 32.1 | 74.4 | 1200 | 35.1 | 120.5 |
1020 | 1200 | 35.1 | 70.4 | – | – | – |
Pipe types 1 and 2 refer to goods with standard or improved insulation. The heat insulator completely seals the pipe body, making pipes that are fitted with insulation and a protective shell superior to pipes that are not. To join the ends of the pipes to a complete line, uncontaminated areas are left there and the seam is deeply melted using welded joints.
In accordance with the same GOST, the protective polyethylene shell’s appearance and quality are likewise regulated:
Options | Characteristics |
---|---|
Surface quality | Pipes-shells should have a smooth outer surface. Minor longitudinal stripes and wavyness are allowed that do not remove the thickness of the wall of the pipe outside the permissible deviations. The inner surface of the pipes should have roughness. On the outer, internal and end surface of the pipes, bubbles, cracks, shells, extraneous inclusions are not allowed. Pipe color – black. |
Relative lengthening in case of rupture, %, no less | 350 |
Changing the length of the pipe-shells after heating at 110 ° C, %, no more | 3 |
Resistance at a temperature of 80 ° C and constant internal pressure, hours, no less | 1000 (with the initial voltage in the pipe wall 3.2 MPa) |
As was previously mentioned, welding is used to install these pipes. A specific procedure needs to be followed when inspecting the seam. After the highway is installed, pipeline segments without insulation at the connection points are sealed with a heat-shrinkable coupling that is packed with mounting foam. This guarantees that the outer shell and the insulation are completely sealed.
Installing polyurethane insulation foam in pipes
The following characteristics of polyurethane foam make it a desirable insulation material:
- Low thermal conductivity.
- High moisture resistance.
- Small weight – density only 45-60 kg/m³.
- With proper installation – the complete absence of cold bridges.
- The ability to give metal pipes additional anti -corrosion protection.
- The duration of the operational period, since the material is not subject to decay and decomposition, as well as racks to atmospheric and aggressive influences and to temperature extremes.
It should be mentioned that prefabricated thermally insulated pipes can be rather expensive, so insulation is frequently applied by PPU spraying on a pipeline that is mounted. However, in this instance, the outer shell—which provides external protection—will be removed from the heat insulator.
Although the lack of polyurethane foam can be seen as its fueling, this material’s negative attribute is not very significant for underground sewer and waterways.
Mineral wool
Mineral wool, which comes in three varieties based on the manufacturing material, is still the most reasonably priced heat-insulating material. These are glass wool, basalt, and slag.
Due to their unique qualities, glass wool and basalt are the only two options that are appropriate for insulating pipes that pass through the ground. Slag loses its ability to insulate against heat quickly because it absorbs moisture in large quantities. Furthermore, its elevated residual acidity triggers the initiation of corrosion processes, and it is completely unsuitable for metal structure insulation. Consequently, this variation of NT SL rejects the other two materials right away and takes into account their technical qualities, particularly since they have been effectively used to insulate the heating main for a long time.
Glass and basalt wool share many similar advantageous properties that fulfill nearly all pipeline insulation requirements. This encompasses the subsequent parameters:
- Low thermal conductivity.
- High resistance to alkaline and acidic substances, as well as other chemical compounds.
- Sufficient elasticity, which allows you to easily make installation not only on straight sections of the highway, but also on bends and turns.
Hygroscopicity, or the ability to absorb moisture well, is the drawback of mineral wool (basalt wool is less prone to this drawback). Therefore, it is essential to provide for dependable waterproofing for the material if it is being used for thermal insulation of the pipeline that passes through the ground. It can be made of dense polyethylene, aluminum foil, or roofing material wound around 400 x 500 mm insulation and intercepted atop metal stainless wire or tape.
Mineral wool insulation for pipes is a necessary external waterproofing measure.
The need for additional waterproofing material raises the overall cost of the project and complicates installation, even though the insulation itself is reasonably priced.
Heating a mineral wool foil cylinder
It should be noted that mineral wool is exclusively offered in mats, canvases, or slabs for use as pipe insulation. Additionally, mineral wool and collapsible cylinders that are ideal for direct pipeline sections are available for purchase.
You may be interested in information on how to choose a heater for the walls of the house inside
What should be the thickness of the insulation layer of the underground section of the pipe?
Thus, the primary insulating materials for pipeline thermal insulation were taken into consideration. The primary attributes of insulation are condensed into a single table in order to facilitate information perception and comparison when making a decision:
Material, product | The average density in the design, kg/m3 | Thermal conductivity of thermal insulation material (W/(M × ° C)) for surfaces with temperature (° C) | Operating temperature range, ° C | Group of combustibility | |
---|---|---|---|---|---|
20 and above | 19 and below | ||||
Mineral -wound slabs firmware | 120 | 0.045 | 0.044-0.035 | From – 180 to + 450 for mats, on fabric, grid, fiberglass canvas; up to + 700 – on a metal grid | Non -combustible |
150 | 0.049 | 0.048-0.037 | |||
Thermal insulation plates from mineral wool on a synthetic binder | 65 | 0.04 | 0.039-0.03 | From – 60 to + 400 | Non -combustible |
95 | 0.043 | 0.042-0.031 | |||
120 | 0.044 | 0.043-0.032 | From minus – 180 to + 400 | ||
180 | 0.052 | 0.051-0.038 | |||
Thermal insulation products from foamed ethylene polypropylene rubber "Aeroflex" | 60 | 0.034 | 0.033 | From – 57 to + 125 | Sweet -growing |
Semi -cylinders and cylinders mineral wool | 50 | 0.04 | 0.039-0.029 | From – 180 to + 400 | Non -combustible |
80 | 0.044 | 0.043-0.032 | |||
100 | 0.049 | 0.048-0.036 | |||
150 | 0.05 | 0.049-0.035 | |||
200 | 0.053 | 0.052-0.038 | |||
Thermal insulation cord from mineral wool | 200 | 0.056 | 0.055-0.04 | From – 180 to + 600 depending on the material of the mesh tube | In mesh tubes made of metal wire and glass threads – non -combustible, the rest of the weak -willed |
Mats made of glass staple fiber on a synthetic binder | 50 | 0.04 | 0.039-0.029 | From – 60 to + 180 | Non -combustible |
70 | 0.042 | 0.041-0.03 | |||
Mats and cotton wool made of super -thin glass fiber without a binder | 70 | 0.033 | 0.032-0.024 | From – 180 to + 400 | Non -combustible |
Mats and cotton wool from a super -thin basalt fiber without a binder | 80 | 0.032 | 0.031-0.24 | From – 180 to + 600 | Non -combustible |
Perlite sand, swollen, small | 110 | 0.052 | 0.051-0.038 | From – 180 to + 875 | Non -combustible |
150 | 0.055 | 0.054-0.04 | |||
225 | 0.058 | 0.057-0.042 | |||
Polistyre thermal insulation products | thirty | 0.033 | 0.032-0.024 | From – 180 to + 70 | Combustible |
50 | 0.036 | 0.035-0.026 | |||
100 | 0.041 | 0.04-0.03 | |||
Heat insulation products from polyurethane foam | 40 | 0.030 | 0.029-0.024 | From – 180 to + 130 | Combustible |
50 | 0.032 | 0.031-0.025 | |||
70 | 0.037 | 0.036-0.027 | |||
Heat -insulating products from polyethylene foam | 50 | 0.035 | 0.033 | From – 70 to + 70 | Combustible |
The main query remains unanswered in the article: to what thickness should insulation be applied? Due to the large number of source data that this parameter depends on, an unequivocal response is not possible. There are thermotechnical SNiP calculation formulas available, but they are complicated and only suitable for experts to understand.
However, you can make use of computed tabular indicators. The State Construction of the Russian Federation has approved the "Code of Rules for the Design and Construction of Thermal Insulation of Equipment and Pipelines," which contains tables similar to this one. Locating them is simple: type "SP 41-103-2000" into any search engine on the Internet, and this document will appear.
The sheer number of these tables—which are compiled for a variety of pipeline applications, including gaskets, temperatures of the pumped liquid, etc.—makes it impossible to fit them all within the confines of this publication. However, this is most likely the solution for a specific underground pipe.
All of this seems to be just one more crucial point, though. It is applicable to insulation, which compacts and shrinks with time, decreasing its ability to provide thermal insulation. We are discussing wool made of minerals.
With time, a layer of mineral wool can cause shrinkage and a seal.
The table value, as established by SP 41-103-2000, might not be sufficient in the long run because the material will compress and the thermal insulation quality will drop dramatically. This is, incidentally, a very common error with potentially dire repercussions. Therefore, it is required to leave a reserve of insulation thickness to account for shrinkage.
This parameter is calculated using the formula below:
H is equal to h× KC×. ((h+D) / (h+2h))
N is the necessary insulation thickness, accounting for potential shrinkage (seal);
H is the tabular value for the necessary insulation thickness;
D stands for the insulated pipe’s external diameter;
Ks is the thermal insulation material’s coefficient of compaction. This can be obtained from the suggested table and is calculated for every kind of constant insulation:
Thermal insulation materials and products | Seal coefficient KC. |
---|---|
Material -worthy mats are firmware | 1.2 |
Thermal insulation mats "Technomat" | 1.35-1.2 |
Mats and canvases made of superficial basalt fiber when laying on pipelines and equipment with conditional passage, mm: mm: | |
– DE calculations, we suggest using the capabilities of the built -in calculator: |
Calculator for accurate determination of the thickness of mineral wool insulation for pipes
Note: When completing calculations for small diameter pipes and a small coefficient of sealing the selected material, the final value of the insulation thickness may occasionally be even less than the initial tabular value. This is where the thermal insulation retains its original thickness.
The publication’s overall conclusion is that using materials designed specifically for insulation—which already have the required shape—is the most practical option. The manufacturer supplies these heat insulators with all the requirements that are required for underground pipelines. Visit this link to learn about polypropylene reinforced pipe.
Details regarding the sizes and technical specifications of foam insulation might be of interest to you.
Afanasyev Evgeny, Chief Editor
The publication’s author on September 13, 2015
Subterranean pipes are an area that is frequently disregarded when it comes to heating and insulation in homes. Maintaining energy efficiency, avoiding freezing in cold climates, and guaranteeing a steady supply of hot water for your home all depend on properly insulating these pipes. Creating a barrier against the chilly ground with materials like rubber or foam insulation is the process of warming pipes buried underground. By minimizing heat loss, this insulation lowers energy costs and guards against damage from burst frozen pipes.It also helps to retain heat within the pipes. Effective pipe insulation is an affordable way for homeowners to protect their heating systems, save energy, and steer clear of expensive repairs.
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