After installation of piping system, air purge or steam purge can be commonly used according to the working medium conditions and the degree of dirt on the inner surface of piping. General requirements for piping purging include: equipment and piping that are not allowed to be purged should be isolated from the purging system. Before piping purging, orifice plates, flanged regulating valves, main valves, throttle valves, instruments, etc., shall not be installed. For the above valves and instruments connected by welding, protective measures such as passing through the bypass or removing seals shall be taken. The purging shall be carried out in the order of main pipe, branch pipe and drain pipe, and the blown dirt shall not enter the pipeline qualified for purging. The dirty things discharged by purging shall not pollute the environment, and it is strictly prohibited to discharge at will. Restricted area should be set before purging. No other operations affecting the cleaning shall be carried out after the pipeline is blown up to the standard.
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