Gas is a flammable and explosive product that we are exposed to in our daily life. The most important thing to note during use is the leakage of gas. Once an accident occurs, it will have a great impact. Let ’s talk about 30 secrets about gas!
Fuel can be divided into three categories: solid, liquid and gas according to its form, and can be divided into two categories: natural and man-made according to its source.
The main component of natural gas is methane, and the explosion limit of natural gas is between 5% and 15%. In order to allow users to use gas safely, odorants are added to town gas. The main odorant is tetrahydrothiophene.
Urban gas transmission and distribution systems generally consist of gate stations, gas pipeline networks, gas storage facilities, pressure regulation facilities, management implementation, and monitoring systems.
When the indoor gas pipeline uses a hose, the allowable working pressure of the hose should not be less than 4 times the design pressure of the pipeline; when the hose is connected to a domestic burning appliance, its length should not exceed 2 meters and there must be no interface; When connecting industrial burning appliances, the length should not exceed 30 meters, and the number of interfaces should not exceed 2.
When installing indoor gas pipelines, the size of flange gaskets for the flange connection of pipelines and equipment should be checked with the sealing surface of the flange. The gasket installation must be placed in the center position. When required, oil-resistant asbestos rubber gaskets or PTFE gaskets should be used; before use, oil-resistant asbestos rubber gaskets should be saturated with engine oil.
The clear distance between the gas pipeline on the ground and the external wall of the building should be 100-120mm. The clear distance between the indoor gas pipeline and the wall surface should not be less than 30mm when the pipe diameter is less than DN25; it should not be less than 50mm when the pipe diameter is DN25-DN40; it should not be less than 60mm when the pipe diameter is equal to DN50; It should not be less than 90mm.
When the gas meter is installed at a high level, the distance between the bottom of the meter and the ground should not be less than 1.4m; when it is installed at a low level, the distance between the bottom of the meter and the ground should not be less than 0.1m; after the gas meter is installed, it should be horizontal and straight, and it must not be tilted; When hanging on the same wall, the clear distance between the tables should not be less than 150mm.
Before installing gas equipment, you should check the product certification, gas installation instructions and quality assurance of the gas equipment; the appearance of the product should have a Product Label and a date of delivery; check whether the performance, specifications, model, and quantity meet the requirements of the design documents. Products that do not meet the above inspection conditions shall not be installed.
The net distance between the gas-using equipment should meet the requirements of operation and maintenance. The net distance between the burner stoves should not be less than 0.5m, the net distance between the large pot stoves should not be less than 0.8m, the oven and other burners, stoves The clear distance between the platforms should not be less than 1.0m.
After the indoor gas pipeline is installed, strength and tightness tests must be carried out. The test medium should be air, and water is strictly prohibited. The test pressure gauge should be within the validity period of the inspection, and its range should be 1.5-2 times the measured large pressure. The accuracy of the spring pressure gauge should be 0.4.
The indoor gas pipeline strength test pressure shall meet the following requirements:
1) The design pressure is less than 10Kpa, and the test pressure is 0.1Mpa;
2) When the design pressure is greater than or equal to 10Kpa, the test pressure is 1.5 times the design pressure and not less than 0.1Mpa.
The town gas supply unit shall be equipped with full-time safety management personnel; it shall be set up and announced to the public for repair at 24h, and the repair personnel shall be on duty for 24h.
Direct replacement is the process of using gas to replace air in a gas facility or using air to replace gas in a gas facility.
Polyethylene plastic pipes for underground gas or medium-pressure steel pipes without cathodic protection shall not be less than once every 2 years.
The inspection content of the pressure regulating device shall include the operation of the pressure regulator, filter, valve, safety facilities, instruments, instruments and other equipment, and there shall be no abnormal conditions such as leakage.
During the inspection of the storage tank in the LNG gasification station, the liquid level and pressure change should be observed, and the parameters such as the liquid level, pressure and temperature of the storage tank should be checked and recorded.
The fuel gas supply unit shall conduct regular inspections of fuel gas user facilities and publicize safety gas use to users.
Emergency repair personnel should wear duty signs, wear anti-static clothing, shoes and protective equipment as required before entering the work area, and it is strictly forbidden to put on and take off and take off in the work area. There should be a special person to guard the work site, and it is strictly forbidden to operate alone.
When the polyethylene plastic pipe breaks, cracks, or is damaged accidentally, windproof and thermal insulation measures should be taken when the ambient temperature during the emergency repair operation is below -5 ° C or in strong wind (greater than 5) weather.
The urban fuel gas facility operation, maintenance and emergency repair management department shall submit the operation, maintenance records and emergency repair project data to the archives management department.
Polyethylene gas pipelines are strictly prohibited to be used as indoor above-ground pipelines, and only used as buried pipelines.
Polyethylene gas pipelines are not allowed to cross under buildings and large structures; they are not allowed to cross under sites where flammable and explosive materials and corrosive liquids are accumulated;
When the polyethylene gas pipeline is buried under the carriageway, the thickness of the top cover of the small pipe should not be less than 0.9m.
The installation procedures of indoor gas pipelines include construction preparation, measurement pay-off, drilling, piping, pipeline and accessories installation and pipeline fixing.
The inspection of indoor gas pipelines includes visual inspection, inspection and supervision of users.
The maintenance methods of gas meters include on-site calibration and regular maintenance.
The common faults of gas stoves are tempering, defiring and yellow flame.
Combustion is conditional, it must be the interaction of the three basic conditions of combustible substances, combustion-supporting substances and fire sources to occur.
The basic fire prevention measures are to eliminate ignition sources, control combustible materials and isolate air.
Ignition sources can be divided into: open flames, friction and impact, electrical equipment, and static electricity.
Only if you understand the various characteristics of gas, can you better prevent it. In addition to paying more attention to it, you should also use tools to prevent it. A gas detector is a product that specifically detects combustible gases and can detect the gas concentration in the range. To ensure gas safety.
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