Naphthalene blockage and removal: In artificial gas, it often contains a certain amount of steam. When the temperature drops, these vapors will condense into solids that adhere to the inner wall of stainless steel industrial welded pipes, resulting in a decrease in the overflow area of the steel pipes or even clogging the pipes. Especially in the cold season, naphthalene often accumulates in the curved parts of steel pipes or where stainless steel industrial welded pipes are drilled out of the ground.
In order to remove naphthalene accumulation, spray and hot dissolution methods can be used.
In the spray method, heated petroleum, volatile oil, or crude mixed xylene are sprayed into the stainless steel industrial welded pipe for coal gas, so that the mist liquid dissolves the naphthalene and then discharges it through the drain.
The hot solution method is to use more than 70% hot water to dissolve naphthalene. Naphthalene can also be removed by pouring hot water or steam into the stainless steel industrial welded pipe for gas in sections. However, due to thermal expansion and contraction, this method can easily lead to loose joints. Therefore, after cleaning, the steel pipe should be tested for air tightness.
Clogging and elimination of other impurities: In addition to naphthalene, other impurities in stainless steel industrial welded pipes for gas can also cause clogging. The main component of these impurities is rust chips, which are usually mixed with tar, dust, etc. in the gas and accumulate inside the pipes, which is also one of the causes of steel pipe blockage.
Because stainless steel industrial welded pipes are easy to corrode, the impurities in the pipes near the gas plant are mainly tar, and the impurities at the end of the pipes are mainly rust. There is currently no ideal mechanical equipment to remove these impurities. For dry pipes, manual cleaning can be performed in sections using the following methods. In general, the length of each cleaning section is about 50 meters. A section of stainless steel industrial welded pipe is cut at each end of each section of the pipe, and then a special scraper and disc wire brush are pulled by a manpower winch to scrape. An air tightness test should be carried out after scraping. If the air tightness test cannot be carried out due to the conditions, the inspection should be strengthened. If there is a blockage in the elbows, valves, drains, etc. of the pipeline, it can be removed for cleaning.