What pipes can be used for gas wiring. What should be the diameter of the gas pipe

The domestic gas pipeline is installed naturally inside the building and premises. Its main task is to transfer gas through the flow meter to all equipment that requires gas supply (from the stove to the fireplace and convector).

The pipeline consists of parts:

• pipes hoses;
• fittings (in other words, connecting elements).

To the components of the pipeline, the aggregate state of the energy carrier and its physical capabilities imply a number of certain tasks:

1. Seal gas fittings and pipes. A gas leak hi only the most unpleasant consequences.
2. The gas pipeline and its components must be endowed with high strength to withstand pressure from 1.5 -2.5 MPa. But the gas pipeline itself has only 0.3 MPa of pressure inside. Thus, the fitting, joint and pipe must be ready for high pressure in a short time.
3. The pipe itself must be created using a corrosion-resistant material and contain anti-corrosion components. But it is not worth protecting its internal part from corrosion, since natural gas does not oxidize such structures.

Important! The whole process of connecting gas to a stove, boiler, convector, etc. should be done only with the help of professionals. But it is recommended to pay special attention to places close to the point of consumption, within the framework of safety, to check the strength several times.

All gas pipes need to be evaluated and systematized, and fittings also come in different types depending on the diameter and material being produced, so we provide a list of product varieties.

Gas pipes and fittings made of steel

Products made of steel are not in vain so often used in the construction of gas pipelines, as they are extremely durable and reliable. And when installing a domestic gas pipeline, both welded pipes and seamless rolled products can be used, regardless of the hot-rolled and cold-rolled manufacturing methods.

As for the internal diameter of the gas pipes, it is not more than ½ inch. The gaseous medium is not viscous, and all corner mates and tie-ins in it are joined at an angle of 90 degrees.

Fittings are designed for threaded and welded mounting. In this case, welding installation implies the creation of an annular seam, which, due to gas soldering, is applied to the cutting of the joint between the pipe and the connecting element.

Not all welders are allowed to this type of welding, but only specialists who have the skills to work with high pressure in the system.

Only this installation is able to beat the joints, tie-ins and corner mates, on long sections of the gas pipeline. But fittings and connecting elements of specific consumption devices are only detachable.

As for detachable installation, it occurs in the following sequence:

• Cutting a spur, on which a lock nut and a fitting with a thread inside are attached.
• The junction is reinforced with a polymer tape and again with such a lock nut.

With the same sequence, threaded connecting elements for gas pipelines are mounted, attaching to the threaded outlet of the gas consumption device.

Important! When the entire gas pipeline system is ready, it turns yellow. To determine the color in production, they put a label on the color scheme that must be used. But you can also leave it in the same place, and paint them in any other color.

Polymer gas pipes and fittings

All kinds of parts and components for a polymer gas pipeline are very easy to cut and can withstand high pressure. They are seamless and for mounting you need a regular soldering iron and connecting elements.

Distinctive qualities are corrosion resistance, strength for underground gas pipelines and reliability for main pipelines with medium and high pressure.

Polymer metal fittings and rubber hoses

Used in the gas pipeline chain to connect to consumption devices. Naturally, a pipe is connected up to a certain distance, but a rubber hose is connected to the device itself and the fitting through a valve.

The gas hose is sold complete with prepared connecting elements (with internal and external threads). Based on this, the installation of the hose is extremely fast and error-free.

During installation, it is necessary to use the FUM polymer tape in order to screw the connecting element into the valve. And after that, the fitting is put on the fitting of the consumption device, also with a polymer tape.

If it so happens that the connecting elements you have chosen are not suitable for gas hoses, then adapters (sleeve and fitting) with two types of thread can fix this problem. One has only to understand that any kind of adapters reduce the strength of the structure itself and gas leaks may occur.

Metal fittings and gas pipes made of metal-plastic

Used for the construction of water pipes and domestic heating systems. These pipes are also used to create a domestic gas pipeline. The pressure that they are able to withstand is about 4.5 MPa, which allows them to be mounted using both threaded and compression fittings. It is desirable to use crimp connecting elements, since they are able to maintain the tightness of the entire structure for the entire time of its use. Because threaded fittings can unwind over time and become a big threat to gas leakage and the emergency state of the whole house.

Their defining quality is the corrosion resistance and flexibility of the heat conductor itself. There is no need to use corner fittings, as it is so flexible that it can be turned in any direction and at any angle.

Good luck in creating your gas pipeline!

When arranging an autonomous gasification of a private house, care must be taken to comply with fire safety standards and applicable SNiP. The current requirements stipulate many important nuances. The standards, in particular, indicate: which pipes for gas supply can be used, features near and in-house installation, etc.

Polyethylene pipes for gas supply

PE pipes used in gas supply systems have earned a good reputation due to ease of installation, long service life, and full compliance with GOST. Unlike metal counterparts, the laying of a polyethylene pipe is much faster and does not require the use of gas-electric welding equipment.

Subject to proper installation, the service life of the product is at least 90-100 years. Polyethylene is not afraid of exposure to carbon dioxide, aggressive environment, and is able to withstand high pressure.

Where is PE pipe used for gas supply

PE pipes are used for laying gas supply pipelines underground. According to existing standards, they are already connected to a residential building by means of polyethylene.

A huge advantage of PE is the ability to create threadless connections by welding, which is a mandatory requirement for installation. Polyethylene can also be used when laying a gas pipeline inside a building.

For the gas pipeline, a pipe of the following categories is produced:

• Class - the material is produced in two classes marked PE 80 and PE 100.
• Dimensional ratio– standard sizes SDR 17.6 and SDR 11 are used, the nominal diameter is 20-400 mm.
• Color - the pipe is black. PE 80 has yellow, PE 100 blue insert stripes.

Marking PE pipes 80 and 100 indicates the characteristics of the material used:

The characteristics of PE pipes and their properties make the use of polyethylene optimal when laying a gas supply pipeline, both in private and industrial gasification.

How to weld a PE pipe

The technology of welding PE pipes fully complies with the requirements of SNiP. After installation, the pipeline has no threaded connections, which ensures maximum tightness and no leakage.

Welding is carried out in several ways:

• Electrofusion welding- the coupling provides the most durable connection that can withstand pressure up to 16 atm. Welding is carried out using heating elements embedded in a sleeve that is put on the pipe. Electrical voltage is applied to the fitting.
• Butt welding - the edges of the pipe are heated with a special soldering iron to a state of viscosity sufficient to fasten the parts together. Fittings for polyethylene pipes are mounted in the same way.

During the construction of gas supply systems for autonomous gasification of a summer cottage or cottage settlement, electrofusion welding is used, which is a more expensive, but reliable installation method. For individual gasification, it is allowed to use butt welding.

Advantages and disadvantages of PE pipes

The choice of using polyethylene pipes for gas supply is easy to justify due to the large number of advantages and the almost complete absence of disadvantages. The positive aspects are:

• Features of the use of PE pipes, depending on their purpose. Products are manufactured taking into account various needs and operating conditions. There is a pipe specially designed for use in water supply and sewerage systems.
  HDPE pipes are designed for gas supply. The material of the pipeline sleeve is able to withstand the pressure and aggressive effects of various chemicals and other substances.
• Resistance to mechanical impact. Surface and underground laying of pipelines of the gas supply network using PE 80 and PE 100 is allowed, even in conditions of seismological activity. The pipe loses its strength only when the building is deformed or shrinks by more than 7%.
  The legislation of Japan (a country with a high level of earthquakes) allows the use of PE pipelines in the course of communications.
• High capacity of the pipe - the inner side of the pipeline is completely devoid of roughness and is absolutely smooth. To supply gaseous mixtures, there is no need to create additional pressure in the system.
  The positive effect of the lack of roughness of polyethylene pipes is obvious when comparing a PE product with metal. The throughput of the former is 25-30% higher. Over time, build-up does not appear on the inside, so the conductivity coefficient does not change.
• Simple laying technology and low cost of polyethylene pipes. Modern pipelines and fittings of gas supply systems speed up the connection process due to the absence of the need to involve complex equipment. Possibility of self-assembly is allowed.
  The cost of PE products is significantly lower than that of copper or steel pipes. Ease of installation is also achieved by the fact that when laying the product easily bends.

There are several disadvantages that must be considered when installing the pipeline:

• Exposure to heat - the maximum temperature of the pipe at which deformation occurs 70-80°C.
• Influence of ultraviolet - as a disadvantage of PE pipes, one can also single out the fact that when direct sunlight hits the surface of the pipeline, a rapid "aging" of the material occurs. Therefore, if PE pipes are laid in a building or above the ground, the surface is stabilized by coating with a carbon black-based polymer.

The minimum service life of a PE pipeline is at least 50 years. During the entire service life, the pipe retains all its characteristics. Therefore, it is better to use PE pipes for gas supply.

Metal-plastic pipes for gas supply

For the implementation of gasification of a private house, metal-plastic pipes PEX-B-AL-PEX-B are used. The sleeve of the product is protected by a polymer composition. The pipe is used for laying inside buildings, including the hidden installation method.

Installation of fittings, adapters and installation of joints are carried out using crimping. Press fittings provide sufficient sealing. The pipe can be laid through living quarters.

Scope of a pipe from a metalpolymer

Polymer-coated metal pipes are mainly used for laying pipelines inside residential premises and connecting household heating appliances and gas consumption sources. A set of fittings allows you to connect to pipes made of other materials (PE, steel, etc.).

Polymer-metal pipes are made from the following materials:

• The outer and inner layers are made of PEX-b polyethylene.
• Adhesive layer - connects plastic and aluminum
• The middle layer - the core is made of aluminum, welded by TIG welding.

Metal-polymer products are not recommended for installation outside the building. Under the influence of ultraviolet rays, the upper polymer layer is rapidly destroyed. The pipe loses its tightness and cannot be used for gas supply.

Manufactured standard sizes and basic parameters of pipes are made in such a way as to ensure the most convenient installation. The consumer is offered a pipe of 16, 20, 26, 32 mm sizes. The material is supplied in coils of 50, 75, 100 m.

Pros and cons of a metal-polymer pipe

Multilayer metal-polymer pipes have a number of advantages over analogues:

• Ease of installation - the crimping mechanism allows you to quickly mount the gas pipeline without the involvement of specialists and expensive equipment.
• Profitability - the pipe bends well, which allows you to get by with a minimum number of fittings when laying a gas supply system.
• Possibility of piping indoors. Good appearance and good tightness of the product make it possible to install even in living rooms.

The disadvantages are the following:

• Limited prospects for the use of metal-plastic pipes - polymer products are intended for laying inside the building.
• Low heating temperature - the product maintains tightness at temperatures from -15 to +40°C.

Metal-plastic pipes are suitable for domestic gas supply; for laying on the street, it is better to use polyethylene products.

Steel pipes for gas supply

Steel products are manufactured in strict accordance with GOST 380 88 for pipes. The requirements stipulate that for underground utilities, the wall thickness should not be less than 3 mm, aboveground 2 mm. Piping units made of seamless steel pipes must have mandatory certification. The documents state:

1. Steel grade.
2. production method.
3. Party number.
4. A mark on the passage of OTK.

The laying of gas supply pipelines from seamless steel pipes is a long and painstaking process. Connection of joints is carried out by the method of electric arc or gas electric welding. Be sure to check the quality of welded joints. Simultaneously with the laying of the pipe, insulation and laying work is carried out.

The main disadvantages of steel pipes are: a complex installation process, high material cost and the need for welding, which significantly increases the laying time.

Copper pipes for gasification

Recently, it has become possible to use copper pipes in low and medium pressure gas pipelines. The standards regarding the use of non-ferrous metals when installing a gas supply system are specified in, as well.

Alloys are not allowed. The material is made of pure copper. For this reason, pipes made of non-ferrous metals are quite expensive "pleasure", therefore they are not widely used.

How to calculate pipe diameter

The choice of internal gasification pipe diameter depends on several factors:

• Gas velocity and pressure.
• The length of the pipeline, starting from the gas tank and ending with the connection to the gas consumption point.
• Minimum system pressure.

An accurate calculation of the inner diameter of the pipe used in the underground laying of gas supply systems and their connection can be done using special calculators. When performing turnkey gasification of a private house, all calculations are made by specialists of a construction and installation company.

Requirements for laying gas pipes

Fire safety engineering, SNiP and FZ regulate the safe minimum distances to the pipeline with gas when performing autonomous gasification of a private house. Additionally, the following factors are taken into account:

1. The presence or absence of stray currents.
2. Hydraulic calculation (presence of groundwater).
3. Building density.
4. soil activity.

Around the house installation of a gas pipe

There are two ways of laying communications: aboveground and underground. The first is often used for industrial facilities. Rules for above-ground laying of pipelines require:

• Make electrical protection at the intersection of power supply systems.
• The height of the pipe in the crowded place is at least 2.2 m, above the carriageway 5 m.
• Under the condition of the complete absence of people and vehicles, the pipeline can be fixed on low supports from 0.35 m.

Underground laying of communications is carried out in accordance with the following standards:

• Gas pipes must be located at least 3 m from the road.
• The depth of the pipes is calculated depending on the freezing point, but not less than 0.8 m.
• Requirements for polyethylene pipes for laying gas supply systems are specified in SP 62.13330. The maximum length of the gas pipeline laying is no more than 50 m.
• The wiring for gas consumption points is carried out along the outer walls of the building. The rules for laying polyethylene pipes for gas supply provide for the possibility of exclusively underground installation of the system. If above ground wiring is required, seamless steel pipes should be selected.
• The normative distance of the low-pressure gas supply pipeline to the wall of the building is at least 10 cm. It is forbidden to place the pipe close to the wall. Entry into the room is carried out by means of a sleeve.

Installation of autonomous gasification of an object is a complex technological event that requires compliance with SNiP and PB, as well as technical regulations for laying pipes. It is almost impossible to do all the work on your own and without violations.

Intra-house laying of pipes with gas

The internal gas pipeline is carried out taking into account the following requirements:

• For installation, a steel or metal-polymer pipe is used.
• It is obligatory to install additional components: pressure stabilizers, thermal shut-off valves, gas contamination alarm.
• The length of the laid pipes is no more than 3 m. In a multi-storey building, the wiring is carried out along the outer walls, directly to each source of gas consumption.
• At the intersection of electrical wiring with gas supply pipes, contact between them is made impossible. If necessary, the wiring is laid in a metal pipe.

Practice shows that the best choice for laying a gas pipeline near the house is a polyethylene pipe, for an intra-house pipe - a metal-polymer pipe. Compliance with all existing standards ensures the safety of operation of the autonomous gas supply system.

The organization of a gas pipeline is an important step towards ensuring the comfort of one's own home, but at the same time, this is complex technical work associated with great danger. It is better to entrust the design, selection and installation of pipes of a certain material and diameter to professionals, but everyone needs to know the basic principles and nuances of arranging gas supply. We figure out which pipes for the gas pipeline are better to choose, which can be used everywhere, and which are suitable only for underground installation.

No. 1. Classification and diameter of gas pipelines

When choosing gas pipes, first of all, it is worth considering gas pressure. Depending on this indicator, gas pipelines divided into these types:

No. 2. Gas pipe laying method

Gas pressure is, of course, a fundamental choice factor, but not the only one. It is also necessary to take into account the operating conditions of the gas pipeline, i.e. its laying features.

According to the method of installation, the gas pipeline is divided into the following types:

No. 3. Gas pipeline material

Until recently, there was not much choice, and in all sections of the gas pipeline, from large nodes to points of consumption in homes, only steel pipes were used. Today, an alternative has appeared in the form of low-pressure polyethylene pipes. Copper pipes are also used. It is unlikely that you will have to suffer the pangs of choice, since each of these materials has strictly defined operating conditions:

• steel pipes can be with different wall thicknesses. Thick-walled products are used for arranging high pressure gas pipelines. If we are talking about above-ground laying, then there is no alternative to steel pipes. These are strong, durable and reliable pipes that can handle a serious load. Thin-walled pipes are suitable for organizing a low-pressure gas pipeline, incl. to set up the system gas supply inside the house;
• polyethylene pipes used for underground installation pipelines with different pressures. There are products that can withstand operation at a pressure of 1.2 MPa. They outperform the steel counterpart in terms of weight, price and ease of installation. Not suitable for above-ground and indoor installation;
• copper pipes in many respects they are superior to steel ones, but their mass use is impossible due to the high price. Above-ground installation with the help of such pipes is not carried out, but this a great option for organizing a gas pipeline inside the apartment.

The network has information about using it as pipes for a gas pipeline metal-plastic and even polypropylene products, but this is still far from the most suitable options.

No. 4. Steel gas pipes

Steel pipes were previously the only way to organize gas supply. Today, when there are alternative solutions, steel still remains in the lead, winning in terms of versatility and breadth of use. For gas pipelines, steel structures are manufactured in different ways. Seamless cold and hot rolled tubes are suitable, as well as spiral seam welded tubes. The use of one or another type of pipe depends on the pressure in the gas pipeline, the temperature regime and the characteristics of the transported gas.

In any case, to create gas pipes, they use high quality steel with a low content of carbon (up to 0.25%), sulfur (not more than 0.056%) and phosphorus (up to 0.046%). It is even better if the steel passes through, which can significantly increase the life of the pipeline.

To main advantages of steel gas pipeline relate:

• high strength, but in order for the structure to be airtight, welds must be performed with the highest quality;
• versatility. Steel pipes can be laid overground and underground, indoors and outdoors;
• operation over a wide temperature range;
• ability to withstand high pressure;
• relatively long service life. Subject to all the rules of installation and operation, you can count on a period of uninterrupted operation of about 40 years.

Among the shortcomings its useful to note:

• the complexity of the installation work;
• high price;
• poor flexibility;
• tendency to corrosion and condensation;
• great weight.

The versatility of steel pipes is achieved by a wide variety of products: on the market you can find products with different wall thicknesses and diameters. Pipes may differ in other properties, and marking can tell all the basic information about the product.

The main parameter of a steel pipe is nominal diameter, is marked as DU. This is, in fact, the inner diameter of the pipe, which determines its throughput. It can vary from 6 to 150 mm. For an internal gas pipeline, for example, pipes with a diameter of 25 mm are selected; for gas distribution systems, pipes of at least 50 mm in diameter are required.

Outside diameter depends on wall thickness. The last parameter ranges from 1.8 to 5.5 mm and sometimes more. For above-ground laying, pipes with a wall thickness of at least 2 mm are used, for underground - at least 3 mm. In some cases (under difficult operating conditions), reinforced pipes with a wall thickness of 5.5 mm or more may be required.

Keep in mind that thin-walled pipes only used in low pressure systems. Such products are lightweight, flexible enough, so they can be used to mount networks of complex configuration. The connection takes place by soldering or by creating threaded connections. On the other hand, such pipes have a high thermal conductivity: condensate can accumulate on them, which negatively affects the material itself, leading to its corrosion. That is why gas pipes are protected with several layers of oil paint.

Use in high pressure areas thick wall pipes. These are solid structures, but the functionality of the entire system will largely depend on the quality of the connection of individual sections. After that, control must be carried out.

On pipes with a DN of more than 159 mm and a wall thickness of more than 3.5 mm, the marking is applied directly to the product. In other cases, all information about the pipes is on the label, which must be present on the package. If the letter H is indicated in the marking, then we are talking about pipes with knurled threads, the letter P is a cut thread, D is an elongated thread, M is the presence of a coupling.

Quality certificates for steel must contain information about the manufacturer, brand, category and group of steel, melt and batch numbers, confirmation of compliance with GOST. The manufacturer must definitely test and check whether the product can cope with the standard pressure. There should not be any defects on the pipe.

If we delve into the theory, then it is worth highlighting a very important point - Depending on the conditions of production, steel can be:

No. 5. Pipes for a gas pipeline made of low-pressure polyethylene (HDPE)

HDPE pipes have recently been in no less demand than steel pipes. It should be noted right away that the phrase "low pressure", which appears in the name of the material, refers to the features of the production of pipes, and not to the operating conditions of the gas pipeline. There are polyethylene pipes withstand pressure up to 1.2 MPa. What makes us abandon the proven option with steel pipes and use polymer ones? The answer to this question lies in the advantages of the material.

The main advantages of polyethylene gas pipes:

There are also cons:

It is better not to use polyethylene pipes for installing a gas pipeline indoors, but they are used more and more often for underground installation.

For the production of pipes are used special pipe grades of polyethylene:

• PE 80- black pipes with yellow inserts, withstand pressure up to 0.3-0.6 MPa;
• PE 100- pipes with a blue stripe, withstand pressure up to 1.2 MPa. During their installation, more serious efforts are made, since the material has to be heated to higher temperatures, but the quality of the connection in this case is at its best.

The diameter of HDPE pipes can vary from 20 to 630 mm or more, even pipes with a diameter of 1200 mm are used. When choosing, it is also worth taking into account such an indicator as SDR is the ratio of diameter to wall thickness. The smaller this value, the thicker the walls and the more durable the product in front of us. SDR ranges from 9 to 26.

The connection of polyethylene pipes is carried out in one of the following ways:

• butt welding. The edges of individual elements are heated with a special soldering iron until a viscous consistency is reached, which allows you to safely connect two pipes into one;
• electrofusion welding involves the installation of the edges of the pipe in a special coupling, to which voltage is applied, due to which heating occurs and the connection of two segments. Such a connection is stronger than the pipe itself and can withstand a pressure of 16 MPa.

With an individual connection to the network, butt welding will be enough, and if, for example, gasification of an entire area takes place, then it is better to use electrofusion welding - it is more reliable and tight.

To connect a section of a steel and polyethylene gas pipeline, special elements are used, one side of which is welded to steel, and the other to polyethylene.

No. 6. Copper pipes for gas pipeline

Copper pipes have been used in the organization of the gas pipeline system relatively recently. They can only be used for laying pipes inside the house at pressures up to 0.005 MPa. For this purpose, drawn or cold-rolled pipes with a wall thickness of at least 1 mm are used.

Advantages:

• attractive appearance. Gas pipes cannot be hidden in walls or ducts - they must be easily accessible. Steel pipes can hardly be called an interior decoration, unlike the copper counterpart. It is unnecessary to hide such pipes - they look neat and attractive, they fit perfectly into many;
• relatively simple installation, which is carried out using press fittings or soldering. In addition, copper pipes are easy to cut;
• plasticity and the ability to create a network of complex configuration;
• sufficient mechanical resistance;
• resistance to aggressive substances;
• durability up to 100 years.

Among cons high price, small range on the market and high thermal conductivity, which can lead to condensation. In terms of strength, copper pipes are inferior to steel pipes, but if we are talking about intra-apartment wiring, then this will not cause any special problems.

No. 7. Metal-plastic pipes for gas pipeline

This is not the most popular option, but, nevertheless, occurring. These pipes can be used to create only gas pipeline inside the apartment, connect gas consumption devices. SNiP 42-01-2002 allows the use of such pipes in buildings with a height of no more than 3 floors. With the help of fittings, you can make a connection with steel and polyethylene pipes.

is a multi-layer construction. The outer and inner layers are plastic, between them is a thin layer of aluminum. This design provides numerous Benefits:

• simple installation, so you can handle it even without the help of a professional and a special tool;
• flexibility, it will be possible to get by with a minimum number of fittings;
• good tightness;
• low price.

Among cons limited scope. Metal-plastic pipes are suitable only for laying inside buildings, they are afraid of prolonged exposure to ultraviolet rays, and when heated above +40 0 C, the tightness of the pipeline is lost, as well as when cooling to a temperature of -15 0 C.

No. 8. Safety requirements for laying a gas pipeline

The laying and operation of the gas pipeline is associated with great risks. To ensure complete security, you must follow a number of rules. Before starting work on connecting a private house to a centralized gas pipeline, it is necessary to notify the local gas service about this. He must report on the pressure parameters in the gas pipeline to which the connection is made and carry out technical coordination, after which a work project is drawn up.

The relevant SNiPs and fire safety rules indicate how and where gas pipeline pipes should pass in order to ensure maximum safety of their operation.

Above ground gas pipeline used in enterprises, as well as in cases where the soil has increased corrosive activity. In this case, they are guided by norms:

When laying underground gas pipes The following rules must be followed at home:

Now the most interesting - norms installation of gas pipeline pipes inside apartments and houses:

• gas pipes cannot be located in residential premises;
• installation of gas pipes in hard-to-reach places is prohibited; they cannot be hidden behind decorative trim. Exceptions are those cases where the external decor can be easily removed if necessary to provide access to the entire pipe;
• the height of the gas pipe from the floor - at least 200 cm;
• installation of gas pipes is possible in rooms with a ceiling height of at least 220 cm and normal ventilation;
• when the gas pipeline is located in the kitchen of this room, it cannot be adjacent to the living rooms;
• the gas pipe should not block window and door openings;
• the length of the flexible section of the gas pipeline should not exceed 300 cm;
• the ceiling above the gas pipeline must be finished with non-combustible;
• for installation, a steel or galvanized exhaust pipe is required, but in no case corrugated aluminum. Naturally, it is necessary to provide for the presence of a fuse in the design of the column, which will shut off the gas supply if the flame goes out;
• the distance from a thin-walled metal pipe to must be at least 25 cm, - 50 cm;
• it is better to exclude the proximity of gas pipes and cooling appliances;

As for pipe diameter, then in the calculation it is necessary to use such parameters as the length of the gas pipeline, gas temperature, allowable pressure drop, thermal power of the equipment and gas flow. In order to correctly calculate the diameter of gas pipeline pipes, it is necessary to use complex formulas - it is better to entrust this task to designers. The network has online calculators that can quickly calculate the required diameter, depending on the data entered. Special tables can also come to the rescue.

Contrary to popular belief, a product such as PVC pipelines can be effectively used not only for laying water supply or sewerage, but also for supplying energy. A gas pipeline assembled from PVC components has many significant advantages, which will be discussed below.

What are the positive features of gas communications based on plastic pipes?

Such a gas pipeline is better than a metal one in that:

1. The service life of the structure under discussion significantly exceeds the similar parameter of the metal structure.
2. Products of this type do not conduct electricity, which in the context of many situations plays an extremely important role.
3. Due to the low weight of PVC structures, the construction of various objects with their use is carried out quite quickly.
4. The construction of any communications using the pipes in question in domestic and industrial conditions is an optimization of the estimate, the use of the same number of metal parts will cost much more.

For a more in-depth study of the characteristics, it is best to read the article on this issue on our website - what other things consist of.

How is the laying of communications in a private area?

If we are talking about the gasification of a private (low-rise) house, then the described process and the use of PVC structures will have their own specifics. It should be assumed that all gas transmission communications collected on the basis of the material under discussion and passing outside the premises (along the street) must be placed under the ground surface, these are the requirements of modern safety standards. It is impossible not to understand that this is an important advantage, because the pipes, being underground, will be reliably protected from the destructive influence of any specifics, and in the event of an explosion (an undesirable option, but it would be careless to exclude it), the soil layer will act as a reliable protection against damage to people and property . At the same time, any person who evaluates the situation from the point of view of logic is aware that in order to place plastic pipes for gas in a private house underground, it will often be necessary to damage sections of the transport infrastructure, which in itself is troublesome and undesirable. Which of the considered aspects is more important - each person will have to decide individually.

It is interesting to note that there are aluminum and fiberglass reinforced pipes, both inside and out. Such products differ only in heat dissipation. The most efficient for heating are fiberglass pipes. They have minimal heat output. About the connection of such materials.

How to choose good gas pipeline parts?

Looking for an answer to the question “which plastic pipes are best for gas?” it is worth proceeding from the pressure under which the system will be operated. A gas transport structure may fall into one of the following categories:

Metal and plastic parts

• Category No. 1. This division covers high pressure systems made exclusively from steel.
• Group No. 2. Intracity transportation systems. The optimal pressure for the operation of such systems is 0.3 - 0.6 MPa; thick-walled plastic parts can be used to create them.
• List No. 3. Gas pressure - from 0.005 - 0.3 MPa. Such systems are used to transfer gas from a distributor to a certain number of high-rise buildings, due to which gas appears in the consumer's apartment. The use of polymer parts is considered acceptable, it is possible to conduct gas with plastic pipes.
• The last subgroup is all kinds of eyeliners inside the apartments. The pressure here is minimal and the use of the products in question is considered acceptable.

Based on such data, it can be said that the answer to the question “can PVC be used for laying a gas pipeline” largely depends on the current technical, climatic and geophysical operating conditions of the structure. But the answer to the question as to whether gas corrodes plastic pipes was given a long time ago and is negative - gas does not interact with PVC. in detail

The arrangement of a gas pipeline to provide a private dwelling or site is considered a difficult technical task due to the explosive hazard of domestic gas. Carrying out the gasification of the premises, one should be very careful with each stage of this work, since any mistake is fraught with very serious consequences.

Most often, gas pipelines for honest houses and apartments are equipped with metal products. Steel pipes for gas supply are characterized by their ability to withstand internal pressure perfectly. Such a pipeline is completely sealed, which reduces the risk of gas leakage to zero. When choosing steel pipes for gas pipelines, it is necessary to take into account the pressure in the gas line.

Conditions in gas pipelines can be as follows:

1. With low pressure - up to 0.05 kgf / cm2.
2. With medium pressure - from 0.05 to 3.0 kgf / cm2.
3. With high pressure - from 3 to 6 kgf / cm2.

What pipes are used for the gas pipeline? The use of thin-walled metal pipes is only permitted on low-pressure gas pipelines. This material has an exceptionally light weight, which makes it possible to equip systems with a complex configuration from it. Also, thin-walled metal pipes are distinguished by good flexibility: if necessary, to give such a product a small angle, you can do without a pipe bender, doing everything by hand.

If necessary, such a pipe for a gas pipeline is easily soldered. In addition, special connecting fittings can be used for steel threaded pipes. Only sealing hemp fiber is used to connect socket thin-walled elements.

Features of using different types of gas pipes

High-pressure gas pipelines are equipped exclusively with massive pipes. If the line has increased strength requirements, it will be necessary to use steel pipes without seams. You should be prepared for the fact that welding such elements is a much more complicated procedure than soldering thin-walled pipes. From the point of view of optimal performance, copper pipes are especially distinguished: in many respects they are preferable to thick-walled steel products. In terms of reliability, both of these varieties are almost the same, but copper weighs much less. From the mass use of copper tubes in everyday life, their high cost keeps them.

When using thin-walled pipes, one should take into account their high thermal conductivity, which is why condensation often occurs on their surface. To protect against corrosion, it is recommended to cover the finished gas pipeline system with several layers of oil paint. Underground gas pipelines are organized using plastic pipes, which are characterized by flexibility, elasticity and low cost. Most often these are products made of polypropylene or polyethylene. For example, polyethylene pipes for gas perfectly tolerate underground conditions during the gasification of private properties. If it is required to equip the cottage with a low-pressure gas pipeline, black polyethylene pipes with the corresponding yellow marking are used. Polyethylene pipes under high pressure are not used as a gas pipeline.

Gas distribution inside the premises is carried out with vulcanized rubber hoses, which have textile reinforcement. They are not suitable for high pressure: they are usually used to connect gas stoves to cylinders or geysers.

The use of flexible hoses has the following limitations:

• If the air temperature in the area exceeds +45 degrees.
• If seismic activity of more than 6 points is possible on the territory.
• At high pressure inside the gas pipeline system.
• If it is required to equip any room, tunnel or collector with a gas pipeline.

All of these situations are prohibited for using HDPE pipes as a gas pipeline. It will be safer to stop at a thin-walled or seamless type steel gas pipe.

Regulations for gas pipelines in apartments

To achieve safety and comfort when using a gas pipeline, the following standards must be observed during its installation and operation:

1. Residential premises cannot be a place for laying gas pipes. The same applies to air ducts and ventilation shafts.
2. Mount a thin-walled metal pipe should be so that it does not block the window or doorway.
3. Laying gas pipes in hard-to-reach places is prohibited. First of all, we mean various decorative wall claddings, unless they can be quickly dismantled. Any section of the gas pipeline must be provided with quick access in case of emergency.
4. The distance between the gas pipe and the floor surface is at least 200 cm.
5. If flexible sections of the gas pipeline from a thin-walled pipe are used, then their length cannot be more than 300 cm. The connection of individual fragments of the system must be done with high quality.
6. It is possible to install gas communications only in those rooms where the ceiling is not lower than 220 cm. Good ventilation must be ensured.
7. When laying gas pipes in the kitchen, its ventilation system cannot be adjacent to the rest of the living rooms.
8. When finishing the ceiling and walls near the gas communication, it is required to use non-combustible plaster. If plaster is not used in the room, then metal sheets with a thickness of at least 3 mm can be used to insulate the walls.

Ventilation and security

When installing a geyser, an exhaust pipe must be used (read: ""). A flexible corrugated aluminum pipe for these purposes is prohibited. Exhaust pipes for the column can only be steel or galvanized. A geyser, like any other heating device, is recommended to be equipped with fuses: they will cut off the gas supply in case of flame outage.

Features of arranging a gas pipeline in the kitchen from thin-walled metal pipes:

• Work begins with shutting off the gas supply valve.
• If the gas pipe in the kitchen needs to be relocated, the gas pipeline should be pre-purged to remove any remaining gas from the system.
• The gas pipe on the wall must be very well fixed. To do this, the product package includes clamps and brackets: they are used taking into account the diameter and length of the pipeline.
• When passing an electric cable near the gas pipeline, a distance of 25 cm should be observed between them. The gas system and the electrical switchboard should be 50 cm apart from each other.
• The gas-piped kitchen system should not be adjacent to cooling appliances such as a refrigerator or freezer. If you close the gas pipes with a refrigerator, its radiator will most likely overheat.
• When installing thin-walled gas pipes, heaters and a gas stove should be removed.
• It is forbidden to lay gas pipes in the kitchen on the floor surface, under the sink, near the dishwasher.
• When carrying out repair work, it is advisable not to use sources of artificial light. The room must be constantly ventilated.

Standards for gasification of a private house

Before starting work, you should notify the local gas service about what is happening. The responsibility of this organization is to provide technical conditions for determining the procedure for gasification. When the technical coordination is completed, an individual project is being developed for the upcoming work. Permission to lay gas communication should also be obtained from representatives of the automobile inspectorate.

If some houses in the area are already gasified, then you only need to connect the gas pipe to the main line. In this case, the gas service is obliged to notify the working pressure parameters in the main pipeline. This will make it possible to choose the right pipes for arranging your site. The gas supply system can be autonomous or central: it depends on which source this area will be supplied from. Private houses can be equipped with aboveground and underground gas pipelines. Mounting and installing gas pipes on the site is not very difficult - usually it is done much faster than obtaining the appropriate permits.

When laying a gas pipeline, the following sequence should be observed:

• Lay the pipeline from the distributor to the dwelling. If necessary, a tie-in is made into the main gas pipeline (more details: "").
• To enter the pipe into the house, a cabinet with a pressure reducing reducer is used.
• Next, you need to organize the distribution of pipes in the premises (kitchen, boiler room). For this, a pipe for a low pressure gas pipeline is used.
• Carry out commissioning procedures, equipment handover and acceptance, check the gas stove and column for operability. Most often, this requires the presence of a gas service inspector.

The structure of the gas pipeline in a private house consists of the same points as a similar system in an apartment.

Sequence and installation rules

Installation work should be carried out according to the following rules:

1. When laying underground gas pipes, the optimal depth is 1.25 - 2 m.
2. At the site where the pipe enters the house, the depth should be reduced to 0.75 - 1.25 m.
3. Liquefied gas can be transported at a depth below the freezing depth of the soil.
4. When installing a gas boiler, it should be noted that one piece of equipment must have a room area of ​​​​7.5 m2.
5. For the installation of boilers and columns with a power of less than 60 kW, rooms of at least 2.4 m will be required.

An autonomous source of gas in the backyard is carried out in accordance with specific safety standards. This will guarantee the normal functioning of the stove, column and boiler. An underground tank should be located no closer than 15 m from the well, 7 m from outbuildings, and 10 m from the house. The most popular types of such tanks are tanks with a volume of 2.7 - 6.4 m3.

Rules for laying underground gas pipelines:

1. What pipes are used for the gas pipeline in this case? With a positive result of the study of soil for corrosion, it is better to refrain from laying underground communications. The exception is situations when high-voltage lines pass nearby: in this case, the pipes are laid underground using additional insulation.
2. If a polyethylene pipeline is laid, high-strength products (PE-80, PE-100) are used for this. PE-80 pipes are capable of withstanding operating pressures up to 0.6 MPa: if this figure is higher, it is better to use PE-100 products or steel pipes for a high-pressure gas pipeline. The depth of penetration into the ground is at least one meter.
3. Communications with a working pressure above 0.6 MPa are allowed to be equipped with reinforced polyethylene pipes. The requirements for the depth of the bookmark here are also from one meter.
4. In areas where arable work or abundant irrigation will be carried out, the depth of laying the gas pipeline is increased to 1.2 m.

If you adhere to all the above requirements and rules, the arrangement of an underground gas pipeline can be done with your own hands.