1 Accumulated water

Gas often contains water vapor, which will condense into water and flow to the lowest part of the condensate tank or pipeline when the temperature decreases or the pressure increases. If the condensate reaches a certain amount and is not removed in time, the pipeline will be cold. Solution: It is necessary to develop a strict operation and management system to prevent water blockage and regularly discharge the condensate in the tank.Condensed water. The location card and pumping record shall be established for each condensate tank, and the pumping date and pumping amount shall be recorded as an important basis for determining the pumping cycle. And can also be found as early as possible groundwater infiltration and other anomalies.

2 Seepage

When the groundwater pressure is higher than that of the gas in the pipeline, it may penetrate into the pipeline at loose joints, corrosion holes or cracks, etc. Generally, it occurs in the place where the pipeline is in disrepair for a long time, the pipeline is corroded and damaged, or the joint of the pipeline is loose due to the construction quality problem, or the buried depth of the pipeline is not in conformity with the regulations, which is on the ground.dynamic loadunder the role. The location where the pipeline is disconnected or broken. Solution: When the amount of water in the condensate cylinder increases sharply, it may be caused by water seepage. At this time, this section of gas pipeline can be closed, gas higher than the infiltration pressure can be pressed in, and then the leakage inspection method can be used to find out the leakage site and repair it until normal gas transmission is achieved.

3 product naphthalene

Artificial gas often contains a certain amount of naphthalene vapor, which condenses into solids when the temperature decreases, or naphthalene removal equipment is not perfect, so that naphthalene adheres to the inner wall of the pipeline, reducing the gas flow or completely blocking the pipeline. In cold seasons, naphthalene often accumulates in the bending part of the pipeline or the branch pipe of the underground pipeline connecting to the postal ground. Solution: to prevent and eliminate naphthalene, first of all, according to the provisions of the specification, strictly control the content of naphthalene in the factory gas, which can fundamentally solve the problem of naphthalene accumulation in the pipeline. In addition, for urban gas pipelines, especially those within 1 to 2 kilometers of the factory, the inner wall often accumulates naphthalene due to severe drought, and the Australian dollar should be cleared regularly. Spray can be used to spray heated diesel oil, volatile oil or mixed ditetrabenzene into the pipe to dissolve naphthalene and then flow into the condensate tank and discharge it with the condensate tank. It is the same as being dissolved by warm water at 70 ℃, so it can also be separated at both ends of the Australian dollar cleaning pipe section, and hot water or steam can be added to remove naphthalene. But this method will make the pipelinethermal expansion and contraction, It is easy to loosen the flexible interface, so after cleaning and washing with this method, the gas pipeline should beTightness test. The serious parts of low-pressure pipelines with naphthalene accumulation are generally concentrated on the branch pipes of households. Iron wires can be connected with steel wires for cleaning, or after digging out the underground pipes of blocked parts, naphthalene can be sucked out by vacuum pump.

4 Other impurities

In addition to the accumulation of naphthalene in the pipeline, the accumulation of other impurities may also cause blockage accidents. The main component of impurities is rust chips, often mixed with tar dust and other accumulated in the pipeline. The corrosion of steel pipes without inner wall coating or with poor inner wall coating is much more serious than that of cast iron pipes, resulting in rust chips. The method to eliminate impurities is to carry out sectional mechanical Australian dollar cleaning on the main pipe, generally about 50 meters as a Australian dollar cleaning pipe section. For iron filings, the iron filings can be scraped clean along the inner wall of the pipe with a scraper and a wire brush in the broken pipe. Sometimes rust filings are too firmly attached to the pipe wall, it is not easy to remove. When removing rust, attention should also be paid to possible corrosion pits on the pipe wall. Do not penetrate the pipe and leak air when removing rust. Pipe turns, valves and drains can be removed or replaced if they are blocked.

5 Pipe Slope

The slope of the gas transmission pipeline is more than that of water, and the blockage is heavier. The reasonable slope is conducive to the removal of liquid and impurities, so the pipeline slope must be greater than 5 ‰.

6 Operation management

The continuous drainage of the water seal along the gas pipeline, the reasonable clearing of the Australian dollar in the pipeline, the collection effect of the electric tar device and the quality of the naphthalene removal equipment are also links that cannot be ignored. To sum up the ancient characters, if you want to reducegas pipelineIt is necessary to improve the quality of net gas, strengthen the operation of equipment, and strive to improve the efficiency of desulfurization and decyanation. Efforts should be made to improve the operating rate and collection rate of the tar generator, reasonably control the operating temperature of Australian dollar naphthalene, and minimize the tar content in the gas. Strengthen the construction management, clean the gas pipeline 1~2 times a year. If the above comprehensive situation adhere to do, we can make the city gas distribution pipeline safe and normal operation.