Devices and elements of gas networks include:
Shut-off valves;
Pipelines;
Condensate traps;
Compensators;
Control conductors;
Control tubes;
Cases;
Directional signs.
Shut-off valves
As shut-off valves valves and valves are used on gas pipelines, on gas pipelines low pressure odor traps can be used. On underground gas pipelines, shut-off valves are installed in wells.
They are used for the possibility of disconnecting individual sections of gas pipelines or buildings.
On low-pressure gas pipelines, parts install hydraulic locks, which are small vertical cylindrical vessels with two obliquely welded branches for connection to the gas pipeline and a pipe welded to the upper bottom and brought out to the ground surface. The gas is turned off when the hydraulic seal is filled with water through the pipe to a height exceeding the pressure in the gas pipeline.
Advantages of the hydraulic seal - simplicity of design and reliability of shutdown; disadvantages - the possibility of water ejection when the pressure in the gas network rises and its self-shutdown in case of untimely removal of the accumulated water.
The disadvantage of hydraulic locks is the duration of operations for filling and pumping out water with a pump.
1 - case; 2 - drainage tube; 3 - carpet pillow; 4 - carpet; 5 - contact plate; 6 - cork; 7 - grounding electrode; 8 - nozzle with a plug for purging; 9 - casing
Rice. 2.1 a) water seal for gas pipelines from 50 to 150 mm
b) water seal for gas pipelines from 150 to 300 mm
Pipelines
A pipeline is an artificial structure designed to transport gaseous and liquid substances, as well as solid fuel and other solids in the form of a solution under the influence of a pressure difference in the cross-sections of the pipe.
Gas pipeline - intended for transportation of associated oil and natural gas... Strategic gas pipelines are intended to be transferred to long distances large volumes of gas - for export and for gas synthesis enterprises.
Rice. 2.2 Gas pipeline
The classification of gas pipelines was discussed in the previous chapter.
Condensate traps
At the lowest points of the longitudinal profile of the gas pipeline, condensate collectors are installed, the capacity of which depends on the diameter of the pipeline and the amount of water accumulating in them. This water enters through leaks that form during operation. Condensate traps vary in size and design features depending on the gas pressure in the network and the volume of condensate.
Rice. 2.3 Condensate traps
Compensators
Compensators are movable elements of pipelines designed to compensate for movements arising from vibrations and thermal elongations. They serve to protect gas pipelines and their equipment from temperature stresses, as well as the possibility of installing and repairing fittings - lens (Fig. 2.3), rubber-fabric, axial wavy and bent (U-shaped), bellows.
Lens expansion joints are made of thin sheet steel in the form of separate semi-lenses welded together, the space between which is filled with bitumen. Lens expansion joints are installed in a somewhat compressed state, taking into account their maximum compensating ability and axial forces.
Rubber-fabric expansion joints are used in heaving soils and earthquake-prone areas. They are made of rubber with layers of nylon fiber in the form of a screw-like hose, reinforced from the outside with a nylon rope.
The use of stuffing box expansion joints on gas pipelines is strictly prohibited, because the design of this type of expansion joint does not guarantee its tightness for a long time.
Rice. 2.4 Lens compensator
Control conductors
The control conductor is a steel rod with a diameter of 8 - 12 mm, welded to steel pipeline... The length of the rod is taken depending on the depth of the pipeline, so that the free end of the rod in the carpet is below the cover by 100 - 120 mm. The welding point of the test lead is carefully insulated by filling with a layer of bitumen.
Control conductors allow you to measure it without opening the gas pipeline electrical potential... This is necessary for timely detection of leaks. direct current from tram, subway and other sources to underground gas pipelines. Leakage currents cause electrochemical corrosion gas pipelines.
Control conductors are installed on sections of gas pipelines located near the track of a tram or electric train at a distance of 200 m from each other, as well as against the suction points of the rail network and at the points where the gas pipeline crosses electric rail tracks, on both sides.
Control tubes
In some places, control tubes are installed above the welded joints of gas pipelines. They are designed to quickly detect gas leaks from an underground gas pipeline. This device consists of a metal casing 350 mm long, semi-cylindrical, with a diameter of 200 mm larger than the pipe diameter. From the casing, laid on a layer of crushed stone or gravel, a pipe with a diameter of 60 mm is diverted to the surface of the pipe, in which gas accumulates during leaks in a controlled place.
Rice. 2.6 Installation options for test tubes:
a) above the surface of the earth;
b) under the carpet.
Carpets
Currently, to ensure safety on gas pipelines underground laying special protective device- gas carpet. Its main purpose is access to control, measuring, shut-off and control valves installed on the pipeline, and its protection from unauthorized entry and damage.
The gas carpet is a cylindrical protective dome-rim with a cover made of steel, cast iron, polymer sand mixture or polymer materials... The product is manufactured in different options standard sizes, which makes it possible to use it on pipelines different diameters... Gas pipelines also use carpets cast from gray cast iron SCH-20 and modern products made of polymer-sand mixture by hot pressing.
The polymer-sand carpet on the gas pipeline almost completely repeats the cast-iron product in terms of characteristics, but it is much easier and easier to install, frost-resistant, durable. Installation of carpets is carried out on concrete base(pillow). Many manufacturers offer rugs complete with a concrete pad and a repair kit consisting of a replacement cover and rim.
Rice. 2.7 Cast iron carpet Rice 2.8 Polymer-sand carpet
Cases
At intersections with by rail, by road, driveways and others engineering structures underground pipelines are laid in cases, inner diameter which are usually 100-200 mm larger than the outer diameter of the pipeline laid in it (taking into account the thickness of the thermal insulation structure). The ends of the case must extend beyond the intersection by at least 0.5 m in each direction, but not less than 5 m from the head of the outer rail. After laying the pipeline, the ends of the case are sealed with tarred tow and poured with bitumen. The case is equipped with a control tube led out under the carpet.
The case perceives ground pressure and moving loads from transport.
1 - gas pipeline, 2 - case, 3 - bitumen enamel, 4 - tarred hemp or jute, 5 - concrete
Rice. 2.9 Case for pipeline passage through foundations and walls
Support
For a gas pipeline laid inside the case, it is possible to provide supports (for steel gas pipelines - dielectric), which should ensure the safety of the gas pipeline and its insulation when pulling the whip in the case. The step of the supports should be determined by calculation in accordance with the section "Calculation of gas pipelines for strength and stability" (SP 42-102, SP 42-103).
Supports can be sliding, roller (roller).
Rice. 2.10 Supports for gas pipelines
Directional signs
To determine the location of the gas pipeline, it is necessary to provide for the installation of indicator plates above or near the gas pipeline, which are placed on the walls of permanent buildings and structures, fences, power transmission line supports, on special reference posts. Gas pipeline route outside settlements denoted by reference columns with right side not closer than 1m from the axis of the gas pipeline on straight sections within the visibility range of not more than 500m.
Fig 2.11 Information plate
A gas carpet is a piece of equipment that is necessary when laying and operating a gas pipeline. This element is necessary not only for underground laying, but also for laying communications on the surface. Outwardly, this element looks like a hatch with a rim. These hatches may have different diameters. The carpet presented on the gasaquatek.ru website is made of heavy-duty and reliable materials that are able to withstand even the strongest outside influences. After all, this device performs the function of protecting the entire system. Usually the carpet is located near the place where the valves or latches are located. They are also installed in places where condensation accumulates in large quantities. The gas carpet must ensure safe and reliable transmission of gas through pipes directly to the consumer.
Gas carpets differ in price, as they are made from various materials... Also, the price depends on the diameter of the device. When choosing a carpet, you should be guided by the goals for which it will be intended, as well as your preferences. The main thing is that the installation of the element is done according to all the rules. Its reliable and sturdy installation is very important, as its use will depend on it. Before installing the carpet, you need to prepare a concrete pad. Its diameter must match the dimensions of the selected element. The base is allowed to be made of polymer. But this is allowed only if you have chosen a carpet made of sand-polymer raw materials.
Appointment of the device
No matter what it is made of gas carpet, and what diameter it has, this element is designed to perform specific functions.
1. He must create an obstacle to any illegal access to the gas pipeline.
2. Protects the entire communications system from corrosion.
3. It is also installed for the purpose of free access of workers to the system, so that they can carry out maintenance of system elements, as well as their repair in case of any malfunctions.
4. The cover provides the ability to install communications underground.
The gas walls of the carpet are very strong and reliable. It is equipped with a locking cover that reliably protects not only fittings, but the entire system as a whole from intruders. In addition, the carpet protects the system from breakage. If it were not for it, not only dirt, but also foreign objects could easily get inside, which could lead to damage and breakdowns of pipes and other components of the system. Another very important function carpet is to provide anti-corrosion protection to the system. It protects it from moisture, atmospheric precipitation and other factors that can provoke oxidation processes, which will subsequently lead to equipment failure. The presence of a carpet can completely protect the entire system from factors that can cause corrosion.
Maintenance and repair
From time to time, situations arise when workers need easy access to the equipment. This can be the maintenance of its elements or repair in the event of a breakdown. To be able to perform the work, specialists need to get to the valves and shut-off elements... Thanks to the carpet renovation work pass more efficiently. It is easier for specialists to work with system elements. This means that the repair will be faster and better. Usually when laying gas pipes there is a place underground, which is often used for laying communications. Workers must also have access to these communications. The carpet provides them. Communication with its help can be carried out without preliminary work.
The purpose of the product is to protect the valve stem in case of wellless installation. Wellless installation of valves widespread modern way arrangement of a blocking unit on an underground pipeline of water supply networks without arranging a well. In this case, the valve is controlled manually from the ground through the stem. The carpet serves as a device that prevents direct access to the stem and protects both the stem and the shut-off valves from mechanical damage.
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Due to the small contact surface with the wheels of the transport, the cast-iron carpet transfers significantly less load to the surface layer of the roadway and does not cause its destruction in comparison with the cast-iron hatch. The decision to develop the product was made in accordance with the wishes of the operating and construction organizations employed in the water supply sector, road construction, creation of urban infrastructure. This took into account European technical regulations and domestic construction experience. As a result of the work carried out, the KCHV-V carpet (D400) received mechanical characteristics that significantly exceed the imported counterparts and can be installed both on lawns and on all types of roads existing in Russia and abroad, including highways. |
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When tested in a certified center, the cast iron carpet withstood the test load applied through a punch with a diameter of 75 mm in excess of 30 tons. The KCHV-V (D400) design allows you to change the height of the carpet installation, adapting it to the change in the surface level during road repairs due to the presence of a thread. The thread is protected from the ingress of concrete or asphalt by a seal that allows it to withstand the temperature of the asphalt during paving. The groove of the cover and the counter plane ensures the absence of such an unpleasant phenomenon as knocking when passing vehicles. Providing reliability and ease of use, the KChV-V (D400) carpet has a rather aesthetic appearance, which can be an adornment of both the urban environment and suburban settlements.
A product providing access to underground shut-off valves. It is made in the form of a cylindrical dome with a cover made of steel, cast iron, sand-polymer mixture or polymer materials.
By the way, plumbing rugs do not differ much from gas, their design is almost the same.
Gas types of carpets:
- functional;
- protective.
Functional purpose of carpets
Carpets are classified as special pipeline equipment that are designed to equip a gas pipeline. They provide access to measurement, control and regulation equipment, which are located underground, as well as to stop valves, which must be installed on gas and pipelines.
Carpets are also classified as protective devices that ensure the safety of gas and pipelines. This is a kind of casing that protects control equipment and other elements from contamination, precipitation and possible mechanical damage. It also prevents unauthorized entry. This is due to the fact that the cover of the carpet is securely bolted, and it can only be opened with the appropriate key.
On modern pipelines mainly used carpets made of cast iron and sand-polymer mixture. Compared to cast iron carpet, mix carpets are much lighter, but also durable, frost-resistant and are in no way inferior to cast iron in terms of characteristics.
Carpets are installed on a concrete base called a “cushion”. "Pillows" are also made to fit. Installation is very simple, and it can be in operation without replacement for more than 25-30 years.
At the Severozapad Metalwork Plant, gas carpets are made from various materials with a matching pillow, which is included in the set.
The cast-iron plumbing carpet is a vandal-proof special hatch (Carpet) - it is a reliable and convenient protective device on any modern water supply system, as well as an underground gas pipeline.
Cast iron carpets for modern valves are necessary for more reliable protection of certain parts of the mounted stems from possible contamination or accidental damage.
Let's consider the main advantages of the used carpets, they are as follows:
- high-quality special technological casting made of durable cast iron;
- resistance to many possible damage;
The product is used for septic tanks and some treatment facilities... A tap carpet of this type provides convenient and easy access to the mandatory control, also measuring, some shut-off valves, including control valves, which are on the pipeline, at the same time reliably protects pipes / fittings from unplanned penetration and damage.
- The color of the carpet we offer is black;
- It is made of durable cast iron carpet;
- The plumbing carpet consists of a special body, a cover, and an axis.
What is a carpet on a modern sewer?
The tap carpet is a cylindrical protective dome-rim with a special cover, made of high-quality reliable cast iron. This product is manufactured in a wide variety of required standard sizes, which allows it to be successfully used on modern pipelines of different diameters.
By the way, carpets specially cast from gray cast iron SCH-20 are also used on gas pipelines; there are also modern products made of durable and light polymer-sand mixture.
The cast iron carpet has substantial mass, and it is quite easy to install, besides it is frost-resistant, very durable. Usually the installation of carpets is carried out on a special concrete base (pillow).
We offer our customers to buy quality products from the most worthy manufacturer. The cover and the body of the product itself are made of durable ductile iron, and the material of this clamp and rivet is high-strength steel. By ordering carpets from us, you will be sure of their high quality, durability and reliability!
Why do you need a gas carpet?
The gas carpet is special device, which is used in the process of laying the gas pipeline. Such elements are necessary both when laying a gas pipeline underground and on the surface. Externally, the carpet is a hatch, which can have a different diameter, and the element also has a special rim. The carpet is made of strong, anti-nuclear and durable materials, since it must provide reliable protection for the whole system. Most often, this element is installed in places where condensate is collected, as well as near the location of the gate valve or valves. The gas carpet ensures reliable gas transportation by pipeline to the end consumer.
Since the gas carpet can be made of different material and have a different diameter, respectively, its cost can also be different. You can choose a certain type of element based on your own preferences and goals, but it is very important that the installation process is carried out correctly. This is due to the fact that the carpet must be securely installed, since further operation depends on the strength of its installation. Often, the installation of such an element takes place in a specially prepared concrete pad. required diameter... If a person opted for a carpet made of sand-polymer material, then the base can also be made of polymer.
Direct appointment of a gas carpet
Regardless of the diameter and material of manufacture, the carpet performs certain functions:
- prevents unauthorized entry to the gas pipeline;
- provides anti-corrosion protection for the system;
- makes it possible to conveniently carry out maintenance and repair of the system;
- makes it possible to carry out underground communications.
The gas carpet has thick and strong walls and a special shut-off cover, thanks to this, outsiders cannot penetrate to the shut-off valves and the entire gas system in order to harm her. In addition, without a carpet, dirt and foreign objects could easily enter the system, which could also provoke a breakdown of the gas pipeline and its components. The second function of the carpet is to protect the gas pipeline components from corrosion. This is also a very important function, because under the influence of moisture or atmospheric precipitation, gas pipeline equipment can oxidize and, accordingly, become unusable. The carpet, in turn, completely prevents the occurrence of such situations.
Of course, any gas pipeline needs periodic maintenance or repair. But in order to carry out such work, specialists need to get to the places where the valves and valves are located. Access to the elements of the gas pipeline is provided precisely through the gas carpet, moreover, thanks to it, work is carried out faster and more conveniently. Since when arranging a gas pipeline, space remains underground, which is very often used for various communications, specialists need unhindered access to the space underground. It is the carpet that provides such access and makes it possible to carry out communications underground, without prior preparation.
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Fri from 9:00 to 17:00 without lunch,
Sat, Sun - day off
map of site
Carpet on the gas pipeline what is
A gas carpet is a cylindrical protective dome-rim with a cover made of steel, cast iron, polymer sand mixture or polymer materials. The product is manufactured in various standard sizes, which allows it to be used on pipelines of different diameters. Gas pipelines use modern products made of polymer sand mixture by hot pressing. The polymer sand carpet on the gas pipeline almost completely repeats the cast-iron product in terms of characteristics, but it is much easier and easier to install, frost-resistant, durable. Installation of these products is carried out on a concrete base (pillow).
The high strength of the products allows them to withstand significant loads (up to 25 and 15 tons, respectively). In most cases, installation is carried out on a concrete base.
Complies with the requirements normative documents: GOST 12.2.003-91
To protect pipeline fittings on overground sections of gas pipelines, polymer sand hatches, polymer sand hatches and sewer hatches are used. Exists special option products for gas, made from a polymer sand mixture by hot pressing.
Carpets made of polymer sand products meet all GOST standards and have found wide application... The parameters of the polymer sand product make it possible to use it as an option for a gate valve in an underground or aboveground design, protecting equipment from damage and contamination. The polymer sand mixture is strong, resistant to corrosion and temperature extremes. The installation of this model is carried out on a base made of the same material.
Small gas carpet (inspection hatch of gas mains)
- bottom flange diameter - 260 mm.
- the diameter of the upper part case is 185 mm.
- lid diameter - 145 mm.
- opening diameter - 120 mm.
- height - 230 mm.
- carpet weight - 8.5 kg.
- Cover - 1 pc.
- Cover axle - 1 pc.
- Passport - 1 copy.
- Case - 1 pc.
Large gas carpet (inspection hatch of gas pipelines)
Polymer sandy gas carpet made according to TU 4859-001-92182598-2013 is intended for maintenance and protection from mechanical damage of gas pipeline devices coming out to the surface of the earth.
Main dimensions and technical parameters:
- bottom flange diameter -390 mm.
- the diameter of the upper part case is 250 mm.
- cover diameter - 240 mm.
- opening diameter - 180 mm.
- height - 230 mm.
- carpet weight - 17 kg.
- Case - 1 pc.
- Cover - 1 pc.
- Cover axle - 1 pc.
- Passport - 1 copy.
The warranty period for the hatches is 60 months from the date of commissioning. Temperature regime operation from -60 to +180 degrees.
You can find out information about the price and availability by sending a request for products
Carpet on the gas pipeline what is
A carpet on a gas pipeline what is a gas carpet is a cylindrical protective dome-rim with a cover made of steel, cast iron, polymer sand mixture or polymer materials.
Gas carpet
Cost: from 3000 rubles.
Cost: from 3 250 rubles.
Register type: Type A Type B Pipe diameter: Select 577689108114133159 Length of registers: Select 0.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.52.62.72.82.93.03.13.23.33.43.53.63. 73.83.94.04.14.24.34.44.54.64.74.84.95.05.15.25.35.45.55.65.75.85.96.06.16.26.36.46.56.66.76.86.97.07.17.27.37.47.57.67.77.87.98.08.18.28.38.48.58.68. 78.88.99.09.19.29.39.49.59.69.79.89.910.00.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.52.62.72.82.93.03.13.23.33.43.53.63.73.83. 94.04.14.24.34.44.54.64.74.84.95.05.15.25.35.45.55.65.75.85.96.06.16.26.36.46.56.66.76.86.97.07.17.27.37.47.57.67.77.87.98.08.18.28.38.48.58.68.78.88. 99.09.19.29.39.49.59.69.79.89.910.0 Linearity: Select 123456789123456789 Paint: Select Standard red primer Standard gray primer Paint according to the RAL catalog Without painting Total: each RUB 0 = RUB 0
Cost: from 700 rubles.
Cost: from 500 r.
Cost: from 1200 rubles.
Cost: from 1300 r.
Cost: from 2100 r.
On this moment there is a growing need for companies that will supply gas facilities. In view of the constant growth of competition, companies in this market segment need to constantly improve.
That is why the company "TechPromMetiz" every day replenishes its assortment with new positions. Since we have modern welding equipment, we can perform welding works of any complexity, as well as to make a gas carpet. Gas carpets are of two types: steel gas carpet and cast iron gas carpet. Having made an order in our company, you do not have to worry about the delivery time, because almost the entire range of goods is available in our warehouse.
We make gas carpets of any size 159, 273, 325, any height, rem. kits in a short time.
The main products manufactured in this area are carpets made from pipes with a diameter of Ф159, Ф273, Ф325.
Gas steel carpets are designed to protect the following emerging on the surface of the earth:
Control nodes,
drain pipes of condensate traps,
hydraulic seals
fittings for underground gas pipelines of urban engineering communications.
Gas carpet
Carpet gas cost: from 3000 rub. Cost: from 3 250 rubles. Register type: Type A Type B Pipe diameter: Select 577689108114133159 Register length:
Gas Cast Iron Carpet Large
- We will make to order any types of cast-iron carpets according to your dimensions and drawings
- The most requested models in stock
- Cast iron carpets pass quality control department
- Branches of the plant are opened in 17 cities of Russia
- We have our own delivery service, which will quickly bring CHEMZ products from the nearest warehouse.
The power engineering plant specializes in the manufacture of a large gas cast iron carpet, which is cast from cast iron GOST 1412-85, grade SCH 1412-85 and is a traditional means of protecting valves installed underground and overhead on gas pipelines for domestic and industrial purposes.
Large gas cast iron carpet, designed for access and protection of control units, drainage pipes, condensate traps, hydraulic locks and fittings of underground gas pipelines. The complete carpet consists of a body and a cover, cast from gray cast iron SCH-15.
Technical characteristics of large cast iron carpet
Flange (base) diameter
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Gas Cast Iron Carpet Large
The power engineering plant specializes in the manufacture of a large gas cast iron carpet, which is cast from cast iron GOST 1412-85, grade SCH 1412-85. The product is cast in several standard sizes and is a traditional means of protection
