Composition of boiler gas pipeline system and matters needing attention in construction?

What are the components of boiler gas pipeline system and construction precautions?

The gas pipeline system is mainly composed of radiation pipe, pressure gauge, ball valve, gas filter, flowmeter, electromagnetic valve, leak detector and pipeline connecting gas main pipe.

Most gas pipeline systems are welded with seamless steel pipes.

Gas transmission and distribution, pressure regulation, liquefied gas storage tanks and other gas supply systems are all completed by liquefied gas stations and gas transmission and distribution stations. Its construction must be undertaken by professional construction or gas supply units.

The gas boiler should also install sampling ports and purging ports on the gas pipeline, and their positions should meet the requirements of blowing out the gas and air in the pipeline. The radiator pipe should be led to the outside, and the outlet should be more than 2m above the star top, and far away from the suction or air inlet of the fan.

The gas pipeline should be electrostatically grounded, and flat steel should be used as jumper at the flange connection. Gas pipelines such as liquefied gas must be cleaned and pressure tested after installation. Liquefied gas pipelines are generally purged with compressed air, the purging pressure is less than 0.3MPa, and the gas is continuously purged for 30min. Check that the purity of the gas blown from the purge port is qualified.

The strength test is still carried out with compressed air, and the pressure should be increased slowly. When the pressure rises to the specified value, the pressure should be stabilized at about 65438+/-0h. Then, when the pressure drops to the design requirements, make a visual inspection, and smear the weld or interface with soapy water to check whether there is any leakage.

After the strength test is qualified, the leak test shall be carried out. During the test, when the pressure rises to the required value, stabilize the pressure for 6h, and make records. In principle, it is recorded every hour. When the pressure drop does not exceed the allowable value for 24 consecutive hours, the test is qualified.

During the construction of liquefied gas pipeline, according to the requirements of hard pipeline, the welding grade should be Grade II and Grade II.

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