Sputtering Copper Target Board For Steam Pipe Blowing Test In Power Plant

Air purge
1. In the process pipeline, all pipelines that transport gaseous media are generally purged with air.
2. Air purging should use the large compressor of the production unit, or the large container in the unit for intermittent purging; the purging pressure should not exceed the design pressure of the container and pipeline, and the flow rate should not be less than 20m/s.
3. When purging oil-free pipelines, use oil-free compressed air.
4. The inspection method of air purging is to inspect the target board with white cloth or white paint at the exhaust port of the purging pipe. No rust, dirt, or other dirt on the target board within 5 minutes is qualified.
5. The angle between the purge port and the ground should be between 30 degrees and 45 degrees. The pipe section of the purge port and the pipe section of the purge port must be welded gently, and the diameter of the purge port meets the requirements.
6. The length of each purge should not exceed 500 meters. When the length of the pipeline exceeds 500 meters, it should be purged in sections.
Steam purge
1. Steam purging is suitable for conveying power steam pipelines or thermal pipelines. Non-thermal pipelines are not suitable for steam purging because heat expansion and other issues are not considered in the design.
2. Steam purging should be carried out with a large flow of steam, and the flow rate should not be less than 30m/s.
3. Before steam purging, the pipes should be heated and drained in time to check the thermal displacement of the pipes.
4. Steam purging should be carried out according to steam-slowly rising warm tube-constant temperature 1h-purging-stop air cooling-reheating pipe heating, constant temperature, second purging, such repetition is generally not less than 3 Times.
5. Medium and high pressure steam pipes and steam turbine inlet pipes should be inspected with flat and clean aluminum target plates and wooden target plates for low pressure steam. The target plate is placed at the steam outlet and the target plate is qualified if there is no dirt.

Application Introduction

After the purge process piping system is installed, it can be blown by air or steam according to the working conditions of the working medium and the degree of dirt on the inner surface of the pipe. The general requirements for pipe purge are:
Equipment and pipes that are not allowed to be purged should be isolated from the purging system.
Before the pipeline is purged, orifice plates, flange-connected regulating valves, main valves, throttle valves, safety valves, instruments, etc. should not be installed. For the above-mentioned valves and instruments connected by welding, the bypass should be used or the seal should be removed. Protective measures such as pieces.
The order of purging should be carried out in the order of main pipe, branch pipe, and drain pipe. The blown out dirt must not enter the pipe that has been purged.
The dirt discharged by purging shall not pollute the environment, and random discharge is strictly prohibited.
A restricted area should be set before purging.
After the pipeline has been purged qualified, other operations that affect the cleaning shall not be carried out.

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