Pipe PE gas. Installation instructions for a compression fitting for a gas pipe. Polymer Compound Models
The presence of a gas pipeline and the continuous supply of household gas to homes today is not a luxury, but an obligatory utility service. Even suburban homes in the bulk of it have everything you need for gas supply. The specialists are always engaged in the installation and installation of the necessary equipment when building a house. But even more often, when carrying out repairs in apartments or changing plates, people try to perform the installation work independently, while not knowing what kind of fittings for gas pipes are suitable and which are unsuitable.
Without a stress component, the chemical is harmless, and without chemical stress, stress is manageable. In the case of these tanks, most of the stress comes from ordinary suspects. Molded stresses arise due to differential cooling rates caused by changes in the thickness of the part wall or weak cooling around the cores and hot tips.
Effects of orientation can also contribute. In addition, the process of assembling these parts creates another factor. These products are molded in two parts and then thermally welded together for several minutes after they are ejected from the tool. If the parts allow to cool completely, they become too deformed for assembly. If the parts are welded before the cooling process is completed, the additional shrinkage that occurs in the assembly occurs under the constraints provided by the weld.
The replacement of the old gas stove with a new one or simply a transfer to another place is always connected with manipulations on the gas pipeline. Before telling what types of fittings for gas pipes are better to use, it is necessary at least in general terms to represent the device of the gas pipeline, and what requirements it must meet.
Device and requirements for domestic gas pipeline
Pipes of the gas pipeline passing inside the house or apartment are a transitional connection from the main main flow through the flow meter to appliances operating on gas. It can be equipment such as:
It is no coincidence that most failures occurred near the welding seam and almost always appeared in the lower half of the assembly, where the impact of gasoline was more constant. The importance of the structure was illustrated by the fact that not all tank designs showed failures. One manufacturer had 19 different tanks, and only four of them displayed malfunctions under controlled test conditions that combined the impact of gasoline with elevated temperatures. If the problem were a chemical attack, they would all fail.
- a gas column for heating water;
- kitchen stove;
- fireplace;
- converter;
- boiler.
The main components of the pipeline are pipes or hoses and connecting elements for them, that is, gas fittings. Every detail through which gas will pass must meet the following requirements:
And one more important point - before deciding on alterations in the gas pipeline, consult an expert yourself, and start working only after you are fully confident in your knowledge and skills.
The effect of gas absorption is obvious. The coefficient that changed was raw material. In most polymers, we focus on the molecular weight, because the density is not a variable. The material with a lower density was not impermeable to the effect of elevated temperature and gasoline absorption. But a lower level of crystallinity in material 946 provided a structure with greater ductility at a given molecular mass, allowing parts to elongate to higher strain levels without breaking.
The material with a higher density was too well organized at the molecular level and reacted to cracking, rather than to stretching. But in practice the converse is true, if we do not replace some of the lost plasticity, while simultaneously increasing the molecular weight.
The need to comply with all these rules dictates the use for gas pipelines of certain types of pipes and docking elements to them.
Criteria for selection and features of models of gas fittings
Of the variety of docking connections available in the assortment for the safe wiring of gas lines, only certain types are suitable that correspond to the required parameters.
Steel fittings and pipes
Products made of high-strength steel have always been famous for their quality. For the supply of household utilities, it is possible to use several types of docking elements. Complete sealing is also ensured by seamless rolling joints, both cold and hot.
Steel bends are laid to residential ladies by land. To protect from harmful external influences, a double surface coating, a primer and a paint are performed.
Butt joints for such lines are made of cast iron, steel or brass. By design, only two types are suitable:
- threaded (detachable),
- welded (monolithic).
Models of fittings designed for permanent jointing are installed during the main gas supply line. The installation features include the formation of a smooth and smooth annular weld using an electric arc method or gas soldering.
The branches leading to the meter and the devices are held together only by split threaded fittings. The tightness of the joints is ensured by the thermally stable polymer material FUM. Such a tape easily falls on the drill, but it can be damaged by the movement of the clutch in a counter-clockwise direction, which will lead to a leak. Therefore installation of gas fittings using FUM tape requires experience and skills.
Polymer Compound Models
In the event that it is necessary to conduct a branch line under the ground, metal structures can not last a long time. Polymeric components are used for wire laying in the ground.
This material is not corroded, and pipes from it remain in perfect condition for many decades. In addition, such bends are able to withstand the highest pressure, they are made in monolithic, that is, without seams, while easily cut, and the docking elements can be fastened with a simple soldering iron.
The connecting parts to such lines must meet all the requirements of strength and tightness. Therefore, polyethylene fittings for gas pipes are not recommended to install. Neither compression nor press models will be able to provide a quality connection, because of the susceptibility to mechanical damage. Even the use of complete insulation, taking into account all security measures, does not provide guaranteed protection against external influences.
The best option in this case are:
- special fittings for HDPE communications, made of brass. Such parts have increased strength, and can provide the necessary tightness;
- welded structure bends are ideal for polymer products. For their installation low-temperature soldering devices are used;
- electric welded fittings equipped with self-melting spirals. These are the most expensive items, but they are also the most reliable.
Metal fittings for metal-plastic pipes
The main purpose of the use of products from this material is heating communications. But in terms of their technical characteristics, they are perfectly suited for domestic gas pipelines. Such pipes are able to withstand up to 4.5 mPa of pressure, and this is twice the standard requirements. In addition, the metal-plastic is perfectly mounted with both threaded and crimp connection parts.
For gas wiring, the designs are ideal. Their uniqueness lies in the fact that such a dock does not lose its qualities over time. While the threaded connection tends to gradually unwind and lose its reliability.
Just like HDPE products, metal plastic is not corroded, and its flexibility and elasticity allows you not to select the fittings necessary bending, and use fittings or couplings.
Installation instructions for a gas fitting fittings
The advantage of the crimping mechanism is that it is able to provide high strength and reliability of the connection, and during installation there is no need to use welding or threading.
The main component of this design is a clamping ring, which is made of high-strength steel. It is able to tighten the parts tightly, and will not weaken with time, since it is additionally held by a special nut.
The rules of mounting such a joint are incredibly simple, and are available for performance by a non-professional.
- saw off a damaged piece of pipe;
- to clean edges from jags and sharp elements;
- with the caliper, check the compliance of the tube diameter and range of indicators in the instructions to the fitting;
- we mount the connecting mechanism in the following sequence:
- Nut;
- Clamping ring;
- Sealant;
- insert one end of the tube into the clamp body, but not tightly;
- at the other end, put on the seal, ring, clamp and push the casing;
- tighten the nut on the body. Joint is ready.
The company "Plast Torg" has been selling gas pipes HDPE for more than 5 years at favorable prices. There are products of different diameters, suitable for the construction of a reliable gas pipeline.
HDPE gas pipes
Gas pipes from polyethylene GOST R 50838-95, TU 2248-018-40270293-2002
Pipes for gas pipelines of low and medium pressure (up to 3 atm)
| Nominal outside diameter, mm | PE 80 SDR 17.6 (0.3 MPa) | PE 80 SDR 11 (0.6 MPa) | PE 100 SDR 11 (1.0 MPa) | PE 100 SDR 9 * (1.2 MPa) | Packaging | |||||
| Thickness. walls, mm | The price is 1 sq.m. VAT included | Thickness. walls, mm | The price is 1 sq.m. VAT included | Thickness. walls, mm | The price is 1 sq.m. VAT included | Thickness. walls, mm | The price is 1 sq.m. VAT included | |||
| 25 | 2,3 | 24,60 | bays | |||||||
| 32 | 3 | 39,93 | 3 | 39,93 | 3,6 | 47,31 | bays | |||
| 40 | 3,7 | 62,17 | 3,7 | 62,17 | 4,5 | 73,82 | bays | |||
| 50 | 4,6 | 96,52 | 4,6 | 96,52 | 5,6 | 114,43 | bays | |||
| 63 | 3,6 | 98,31 | 5,8 | 151,37 | 5,8 | 151,37 | 7,1 | 181,99 | bays | |
| 75 | 4,3 | 141,60 | 6,8 | 213,58 | 6,8 | 213,58 | 8,4 | 257,24 | stretches, coves | |
| 90 | 5,2 | 200,60 | 8,2 | 303,26 | 8,2 | 303,26 | 10,1 | 370,52 | stretches, coves | |
| 110 | 6,3 | 276,10 | 10 | 448,40 | 10 | 448,4 | 12,3 | 551,06 | stretches, coves | |
| 125 | 7,1 | 388,22 | 11,4 | 594,72 | 11,4 | 594,72 | 14 | 709,18 | lengths of 13 m | |
| 140 | 8 | 488,52 | 12,7 | 739,86 | 12,7 | 739,86 | 15,7 | 892,08 | lengths of 13 m | |
| 160 | 9,1 | 621,86 | 14,6 | 952,26 | 14,6 | 952,26 | 17,9 | 1161,12 | lengths of 13 m | |
| 180 | 10,3 | 796,50 | 16,4 | 1228,38 | 16,4 | 1228,38 | 20,1 | 1471,46 | lengths of 13 m | |
| 200 | 11,4 | 987,66 | 18,2 | 1515,12 | 18,2 | 1551,15 | 22,4 | 1820,74 | lengths of 13 m | |
| 225 | 12,8 | 1221,30 | 20,5 | 2238,46 | 20,5 | 1884,46 | 25,2 | 2301,00 | lengths of 13 m | |
| 250 | 14,2 | 1543,44 | 22,7 | 2358,82 | 22,7 | 2358,82 | 27,9 | 2824,92 | lengths of 13 m | |
| 280 | 15,9 | 1922,22 | 25,4 | 2955,90 | 25,4 | 2955,90 | 31,3 | 3552,98 | lengths of 13 m | |
| 315 | 17,9 | 2384,78 | 28,6 | 3668,62 | 28,6 | 3668,62 | 35,2 | 4485,18 | lengths of 13 m | |
| 355 | 32,2 | 4747,14 | 39,7 | 5707,66 | lengths of 13 m | |||||
| 400 | 36,3 | 5909,44 | 44,7 | 7236,94 | lengths of 13 m | |||||
* There is a complete package of permits for the use of pipes
| Max. Working pressure MPa, MPa | The design value of the safety factor C for the maximum operating pressure of the MPA | ||||
| SDR 17.6 | SDR 17 | SDR 13.6 | SDR 11 | SDR 9 | |
| Pipes from PE 80 (MRS 8.0 MPa) | |||||
| 0,3 | 3,2 | 3,3 | 4,2 | 5,3 | 6,7 |
| 0,4 | 2,4 | 2,5 | 3,2 | 4 | 5 |
| 0,6 | 2,1 | 2,7 | 3,3 | ||
| 1 | 2 | ||||
| Pipes from PE 100 (MRS 10.0 MPa) | |||||
| 0,3 | 4 | 4,2 | 5,3 | 6,7 | 8,3 |
| 0,4 | 3 | 3,1 | 4 | 5 | 6,2 |
| 0,6 | 2 | 2,1 | 2,6 | 3,3 | 4,2 |
| 1 | 2 | 2,5 | |||
| 1,2 | 2,1 | ||||
Product Features
For the construction of the gas pipeline system, gas polyethylene pipes of 2 grades - PE 100 and PE 80 are used, which are manufactured in strict accordance with GOST R 50838-95 and P 50838-2009.
Gas polyethylene pipes are highly flammable (at temperatures over 360 degrees). But they are completely safe for human health (non-toxic and explosion-proof).
Sphere and features of use
The scope of HDPE gas pipes is very limited. They can be used only in the construction of underground gas mains. They are also prohibited from being installed in seismic regions, under motorways, railway crossings, etc. If the system passes through such areas, the HDPE gas pipe must be placed in a special metal container.
Pros of polyethylene pipes for gas
- Increased resistance to destructive effects of the environment. HDPE gas pipes are not subject to corrosion, rot and do not deform under the influence of low (-15) or high (+40) temperatures;
- Long service life. Producers of polyethylene pipes for gas provide a guarantee for up to 50 years, but the actual lifetime can exceed this figure;
- Possibility to use for building a system with any pressure level;
- Low price. A gas polyethylene pipe costs about 40% less than a steel pipe.
Technical indicators
LPG gas pipes have many technical features. First, all pipes are marked with a special yellow stripe running along the entire length of the pipe. They can also have a yellow or orange color. The symbol always contains the word "GAZ". These requirements are determined by GOST and are binding. Therefore, if you see a 25 mm HDPE gas pipe without these signs, it is most likely a low-quality product.
The site has a table showing all the characteristics of the gas pipes. It contains the following parameters:
- D is the outer diameter of the pipe in mm;
- E is the thickness of the wall;
- S is the difference between the nominal and average diameters;
- SDR is the value of the diameter related to the wall thickness.
Also in the table you will find information about the cost of products. All prices for gas HDPE pipes are up-to-date.
If you want to buy a HDPE gas pipe of 25 mm or any other products, please contact the company manager who will answer all your questions and send a detailed price list. For wholesale and large buyers special tariffs are virgin, which will save on the purchase of materials.
