The pipeline that transports natural gas from mining areas or processing plants to urban distribution centers or users of industrial enterprises, also known as gas pipelines. The use of natural gas pipelines to transport natural gas is the only way to transport large quantities of natural gas on land. About half of the pipelines in the world are gas pipelines. In the decoration of houses, many people want to reform natural gas tables and natural gas pipes for aesthetic reasons. Natural gas reform is also one of the biggest hidden dangers in renovation and renovation. A slight misconduct may cause future safety problems. The following Xiao Bian will share with you some notes on the transformation of natural gas .
Natural gas pipeline structure features
Pipe structure
The gas pipeline is assembled by a single pipe connected one by one. Modern gas-gathering pipelines and gas pipelines are made by welding steel pipes. There are a variety of seamless steel tubes, spiral seam tubes, and straight seam tubes. Seamless tubes are suitable for tubes with a diameter of 529 mm or less, and spiral and straight seam tubes are suitable for large-diameter tubes. The pipe cross-section structure of the gathering pipeline is complicated with the inner coating-steel pipe-outer insulation layer-insulation (cooling) layer; the simple one is only the steel pipe and the outer insulation layer, while the inner wall coating and the insulation (cooling) layer are both The gas transmission process is further confirmed.
Natural Gas Pipeline Materials
Steel pipe is the main material of the pipeline. Natural gas transmission steel pipes are special metallurgical products formed by deep processing of plates (bands). The organizational form of pipeline steel, due to the difference in process technology, there is a certain difference in the pipeline steel produced by various manufacturers. In the 1960s, X52 steel grades were generally adopted, X60 and X65 grades were used in the 1970s, and X70 steels were mainly used in the 1980s and 1990s. Gas pipelines in some foreign countries have begun to use X80 steel. With the continuous development of pipeline steel research, Canada and other countries have laid test sections for X100 and X120 pipe steels. In China, the X80 grade pipe steel was used for the first time in the test section of 7.71 km in the linking project of the Suining tie line. The 4843km-long West-East Gas Pipeline No. 2 trunk line used X80-grade pipe steel with a diameter of 1219mm to increase the gas transmission pressure to 12Mpa. In general, X80 steel is a ferrite and bainite duplex structure, X100 pipe steel is bainite, and X120 pipe steel is ultra-low carbon bainite and martensite. For natural gas pipelines, strength, toughness and weldability are the three most important quality control indicators.
Natural gas pipeline characteristics
1) The gas pipeline system is a continuous closed transport system.
2) Natural gas is under pressure from the transportation and storage to the user's use.
3) Since the proportion of natural gas to be transported is small, the effect of static head is much smaller than that of liquid. When the height difference in design is less than 200 meters, the static head can be neglected, and the line is hardly limited by longitudinal terrain.
4) There is no liquid pipe hazard.
5) In the event of an accident, the hazard is large and spreads widely. Once the pipeline is broken, the release of energy is large, the length of the tear is longer, and the discharged natural gas is exposed to an open flame, which also leads to fire.
Natural gas pipeline renovation process
Installation application: Where the project requires the installation of pipeline natural gas, the owner submits an application to the Market Development Department. The natural gas company organizes personnel to carry out on-site surveys, responds to the applicants, and is responsible for the unified coordination of all aspects of design, installation, and ignition.
Open an account: Bring an account opening notice, ID card, real estate license, or property lease contract, sign a gas natural gas supply contract, and pay the account opening fee within 5 working days.
Transfer: With the identity card, real estate license or house lease contract, the new resident can consult the customer service department to pay the gas charge and natural gas meter of the former tenant, settle the gas cost, handle the transfer procedure, and pay the relevant fees.
Renovation construction: The transfer, removal, modification, and installation of indoor pipeline natural gas facilities shall apply to the natural gas company, pay the survey fee, measure renovation costs for home surveys, go to the construction site, and settle the total expenses.
II. Precautions for the transformation of natural gas pipelines
The laying of natural gas pipelines during home renovation is a big problem. For the sake of family safety in the future, construction workers must pay attention to safety when laying pipelines, taking into account various safety distances. Here we will introduce the precautions for the installation of natural gas pipelines. We hope that they can be used in future renovations as a reference.
Gas pipelines meet other requirements when meeting other pipelines
When laying horizontally parallel, the net distance should not be less than 150mm; when laying in parallel, the net distance should not be less than 100mm, and should be located on the outside of other pipelines; the net distance should not be less than 50mm when cross laying; the pipeline can not be hidden in the wall; natural gas pipeline is not It can be installed in the wall like a cable and must be installed outside the wall so that it can be easily detected and repaired. The wall near the wall must not be a flammable material such as wood. The pipeline should be short and not long; in order to reduce the occurrence of accidents, natural gas pipelines should be short or not long. Try not to cross the bedroom or the living room. If it is necessary to pass through, be sure to take protective measures, such as installing a pipe sleeve outside the pipeline.
1. Hose is not suitable for connection between burning appliance and pipeline
Most stainless steel pipes are used in the connection between most domestic appliances and pipes, but there are still a few old houses that use hoses. Hose is easy to age, and if it is not updated in time, it can easily cause a leak.
2. Gas meter must be ventilated
The gas meter in the kitchen should be placed in a ventilated location, which is not only safe but also convenient for the relevant personnel to check when they are charged. During the renovation, the owner shall not change the gas meter himself or move his position without permission. If maintenance services are required, local gas supply units must be found. Maintenance should be carried out when the air supply is stopped. After the gas meter is reinstalled, it must be promptly inspected. After the pressure test and leak test are qualified, it can be put into use.
3, after the transformation of the pipeline need to carry out safety inspection
In order to prevent damage to the natural gas pipelines and fittings during renovations, safety inspections should be conducted promptly after the completion of the renovation to check if there is a gas leakage in the natural gas pipelines. After the inspection, it is found that there are no problems before they can be put into use. Otherwise, professionals should be found in time. Make repairs. If leaks are found during the inspection, notify the gas supply personnel for maintenance.
Summary: The above is related information on the considerations for the transformation of natural gas pipelines. It is for reference only and hopes to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
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