Liaocheng Strate Materials Co., Ltd. News: The pressure test of the low-temperature pipeline (Q345D seamless steel pipe), in order to prevent the water inside the valve from purging and freezing, how to conduct the test? The barometric test is too dangerous.
Hydrostatic testing is not recommended for cryogenic systems. If the purge is not complete, ice plugs are likely to occur. Under normal circumstances, the use of air pressure test, the test pressure of 1.15 times the design pressure, the problem is not great, because the water pressure test after the airtight test, the test pressure is the design pressure.
If there is a danger of air pressure testing, there is another way: only airtightness tests are performed, since the butt welds at temperatures below -20 degrees are to be subjected to 100% ray inspection if all welds (including fillet welds) are added. 100% magnetic powder on the outer surface or penetration test can avoid pressure test.
This related knowledge is published.
Zhejiang Nanhua Electronic Technology Co., Ltd , https://www.nhloadcell.com