The regulations and requirements for the laying of gas pipes in the building code

Avoid facing the weld of the pipe body towards the wall, and the pipe with inconspicuous weld should be marked in advance.

During the construction of gas pipelines, in order to avoid facing the wall welds of the pipe body, the pipes with inconspicuous welds should be marked in advance. The installation of copper pipes or stainless steel bellows laid in the pipeline shaft has been carried out after the construction of drawings and other pipelines has been completed, and the casing should be added when the pipeline passes through the partition plate in the shaft, and the spacing between the casing and the pipeline should not be less than 5mm.

The painting of indoor gas pipelines and their pipeline accessories should be carried out after the actual pressure is qualified; When using steel pipe welding, painting should be carried out after removing rust (see metallic luster): brush two anti-rust primers on all welds, and paint two anti-rust primers and two topcoats on the whole; When the galvanized steel pipe is threaded, the rest of the pipe fittings should be brushed with an anti-rust primer and then fully coated with two topcoats after installation.

Extended Information: Requirements for the Use of Gas Pipelines:

1. Users must comply with laws and regulations, and use gas appliances that have been tested by statutory testing institutions to meet the adaptability requirements of local pipeline gas and accept the safety supervision of local gas companies.

2. It is strictly forbidden to knock and collide with hard objects on pipelines and meters, and sundries and flammable products shall not be stacked around (within 1 meter) of clothes and gas supply equipment (including indoor and outdoor equipment) on the pipeline, and no buildings and door locks shall be installed around indoor equipment; Gas pipelines and gas facilities shall not be used as grounding wires for electrical equipment.

3. The kitchen where gas facilities are installed should be ventilated frequently, and it is strictly forbidden to live in people, and it is advisable to be equipped with a small fire extinguisher or a small amount of dry powder fire extinguishing agent to prevent accidents.

In the traditional natural gas transmission and distribution scheme, steel pipes, cast iron pipes, etc. account for a large proportion, however, with the passage of time, the corrosion resistance, transportation and installation of steel pipes remain unchanged, and the high cost and other issues have been paid more and more attention. Due to its long service life, good wear resistance and toughness, convenient and fast construction, low maintenance cost and low comprehensive cost, it is gradually becoming the preferred material for urban natural gas pipelines.

Natural gas pipelines occupy a pivotal position in urban natural gas projects, and their cost is about 40% of the entire project, and its economy and economy are very important. The construction cost of PE pipes is low, and its characteristics are: the cost of PE pipes is lower than that of steel pipes, and its life can reach 50 years, and the life of steel pipes can reach 18 years.

Secondly, the PE pipe has good toughness, as long as the steel pipe is inserted into the pipeline, there is no need to excavate the working pit, and the construction party is less, which saves the construction cost; In addition, the cost of non-destructive testing of P-shaped steel pipes is high, while the detection method of PE pipes is simple and the detection cost is low. On the whole, the investment cost of polyethylene gas pipeline is low, and the economy is running well.

In urban construction and other buildings, due to the fact that there are too many pipelines in various specialties, the flexibility and flexibility of PE gas pipelines are strong in complex environments, and in the case of narrow space, old collapse and narrowness, large-angle bending can also be achieved through the flexibility of PE.

PE gas pipeline is a kind of polyethylene polymer, which is chemically stable, resistant to acid and alkali, stray current and chemical substances have a relatively weak erosive effect on the pipeline, while PE gas pipeline does not need special corrosion protection when laying, and its service life can reach more than 50 years.

Due to its own lightweight characteristics, PE pipes do not need hoisting machinery to transport pipelines during operation, and the welding of PE pipes is generally hot-melt welding, which has a high degree of automation, lightness, convenient welding construction, low labor intensity and high efficiency. PE pipes have good flexibility, and in the actual maintenance and repair, no open flame will be generated, thus reducing the danger of maintenance work. In addition, PE gas pipe has obvious advantages in trenchless pipeline construction, especially in buildings, roads and other cities where pipelines are vertical and horizontal, because it has many advantages such as convenient construction resistance, fast welding speed and large deflection.

Household gas should always pay attention to safety issues, and the use process and safety process should also be strictly controlled, so what is the gas pipeline installation specification, and what should be paid attention to in the installation of gas pipelines?

1. The gas pipeline should be far away from bedrooms, warehouses, substation rooms, flues and other locations; 2. When the gas pipe passes through the building wall or pipe trench, it needs to be installed in the casing; 3. If the gas pipeline needs to pass through the room with corrosive substances, it needs to be protected against corrosion; 4. When the gas pipe passes through the bedroom, it needs to be welded and wrapped with a casing.

2. What should be paid attention to in the installation of gas pipelines?

1. When the natural gas in the community is installed, the gas company will turn on the gas and let it enter the home of the owner of the community through the pipeline for normal use. Therefore, at this time, individuals must not dismantle and reinstall their gas pipelines without permission, so as not to bring danger, if there is a problem, be sure to contact a professional to deal with it.

2. The indoor natural gas equipment is installed by professionals, and the location of the equipment is also in the best condition. At this time, it is forbidden for the owner to modify and dismantle the natural gas equipment privately, otherwise it is easy to cause damage to the equipment and cause gas leakage, which brings great danger to the family and is not conducive to normal home life.

3. The installation of the gas meter should also be paid attention to, the location must be selected correctly, it can not be installed in a humid environment, and it cannot be too close to the power supply, otherwise it will affect the normal operation. Moreover, in the location where the gas meter is installed, there should be a good ventilation effect, and waterproof measures should be taken to avoid accidents in later use.

About what is the gas pipeline installation specification, and what needs to be paid attention to in the installation of gas pipelines, I will introduce it here, do you understand? The installation of gas pipelines is very important, and if there is a slight problem, it will lead to the existence of safety hazards, so special attention is required.

According to the Code for the Design of Urban Gas, the layout requirements for gas pipelines mainly include the following aspects:

Gas pipelines should try to avoid crossing railways, rivers, major highways and other large obstacles, and protective measures should be taken when they must be crossed;

The gas pipeline should be buried below the soil freezing line, and the minimum covering thickness of the buried soil should meet the requirements of the code, and different sites have different standards;

A certain horizontal and vertical clear distance should be maintained between the gas pipeline and the building, structure or adjacent pipeline to prevent mutual interference and damage;

When the gas pipeline passes through the drainage pipe, thermal pipe trench, tunnel and other structures, it should be laid in the casing and sealed at both ends;

When the gas pipeline crosses the railway and tram tracks, it should be laid in the casing or culvert and meet a certain distance requirement;

When the gas pipeline passes through the river, it can be crossed by crossing the river bottom, using existing roads and bridges or crossing by pipe bridges, and taking measures to stabilize the pipe and sign it;

Outdoor overhead gas pipelines can be laid along the exterior walls or pillars of buildings, but attention should be paid to the spacing, drainage and insulation measures with other pipelines;

Gas pipelines are not allowed to be laid under buildings and structures, overlapping with other pipelines and laying out in a flat and flat direction, and are prohibited from laying under flammable, explosive and corrosive places;

The detection pipes on the gas pipelines, the drainage pipes of the condensate tank, the water seal valves and valves should be provided with guards or wells.

Answer]: b, c, d, e

A wrong, buried under the roadway, shall not be less than: B pair, when the use of manual excavation and no groundwater, the bottom of the tank reservation value should be right, (1) not early stove to use frozen soil, garbage, wood and soft matter backfill. The backfill on both sides of the pipeline and above the top of the pipe shall not contain gravel, bricks and other sundries, and shall not be backfilled with ash.

D pair, (5) after the backfill is compacted, the density should be checked in layers, and the backfill record should be made. (1) Warning tapes should be continuously laid along the lines of buried gas pipelines. Before the warning tape is laid, the laying surface should be flattened and laid directly above the pipeline, and the distance from the top of the pipe should be appropriate.

"Code for Design of Urban Gas" The minimum covering thickness (from the road surface to the top of the pipe) for the burial of underground gas pipelines shall meet the following requirements:

1) When buried under the roadway, it shall not be less than;

2) When buried under the non-roadway, it shall not be less than;

3) When buried in the courtyard, it shall not be less than;

4) When buried under a paddy field, it shall not be less than.

Note: When effective protective measures are taken, the above provisions can be appropriately reduced.

Indoor Gas Pipeline Installation Requirements:

1) The gas pipelines inside the building and structure shall be clearly established.

3) Indoor gas pipes should not be laid in humid or corrosive rooms. When it must be laid, anti-corrosion measures must be taken.

4) Gas pipes are strictly forbidden to be introduced into bedrooms. When a gas horizontal pipe passes through a bedroom, bathroom or basement, it must be welded and must be located in the casing.

5) In the basement, semi-basement, equipment floor, above-ground closed room and underground garage installation of gas inlet pipes should use seamless steel pipes with steel numbers or other metal pipes with the same or above performance, must be welded connections.

6) When the indoor gas pipe passes through the floor, stair landing, wall or partition wall, it must be installed in the casing.

7) Seamless steel pipes or welded steel pipes should be welded or flanged connections.

If it does not meet the requirements of the specification, the horizontal distance between the low-pressure gas pipeline and the non-gas-using room shall not be less than 30cm, and the medium pressure shall be 50cm