After the piping system is installed, it can be air-swept or steam-swept according to the working conditions of the working medium and the dirtiness of the inner surface of the pipe. The general requirements for pipeline purging are:

Equipment and pipes that are not allowed to be purged should be isolated from the purge system.

Before the pipeline is purged, orifice plates, flanged control valves, main valves, throttle valves, safety valves, instruments, etc. should not be installed. For the above-mentioned valves and instruments connected by welding, flow through the bypass or remove the seal Pieces and other protective measures.

The sequence of purging should be carried out in the order of main pipe, branch pipe, and drain pipe. The blown dirt should not enter the pipe that has passed the purge.

The dirt discharged by purging shall not pollute the environment, and it is strictly forbidden to discharge at will.

The forbidden area should be set before purging.

After the pipeline is qualified for purging, no other operations that affect cleaning shall be carried out.

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1. After the strength test of the pipeline system, before the air pressure tightness test, the purge and cleaning should be carried out in sections

2. The method of purging should be determined according to the requirements for the use of the pipeline, the degree of dirt on the working medium and the inner surface of the pipeline. Liquid or gas pipelines with a nominal diameter greater than or equal to 600 mm should be manually cleaned. Use water to clean, and the gas pipe with nominal diameter less than 600mm should be purged with air. Steam piping should be purged with steam, and non-thermal piping should not be purged with steam. The smooth flow of purging is generally carried out in order according to the main pipe, branch pipe, and drainage pipe.

3. Before blowing the pipeline, a detailed blowing program should be prepared and carried out in accordance with the system

4. Equipment and pipelines that are not allowed to be purged are separated from the purging system.

5. After the pipeline blowing is qualified, in addition to the prescribed inspection and restoration work, other work that affects the cleaning of the pipe shall not be carried out, and the "Pipeline Blowing Record" shall be filled out