Problem of abnormal noises during hydrostatic testing
Thread Content
The hydrostatic test requires that there be no abnormal noises during the test. If abnormal noises are heard during the testing process, with no other abnormalities but no issue identified, should the equipment be deemed to have passed the hydrostatic test, or should another hydrostatic test be conducted?
What is the experimental pressure? Follow GB-50235; the absence of an identifiable cause does not mean it is considered non-compliant. It is likely caused by pipe displacement or deformation of the supports (in particular, the spring supports must not have their positioning pins removed); a thorough inspection is needed. It could also be due to issues related to the load bearing capacity of the pipes, or problems such as welding failure of temporary blind plates or end caps. Also, I need to confirm whether it’s the sound coming from the pipes being pressure-tested; we’ve tested four or five thousand pipes and never encountered any unusual noises.
Sometimes the equipment is not perfectly round, and it self-adjusts during the application of water pressure, which results in unusual noises. In such cases, more thorough inspections should be carried out; if no other issues are detected within the specified time frame, it can be concluded that the water pressure is satisfactory.
The water used in pressure testing remains stationary, and generally no noise is produced, as the test requirements dictate that the pressure must be maintained for a sufficient amount of time before inspection can take place; it is dangerous to conduct inspections immediately after the pressure reached the required level. For the hydrostatic tests we conduct, it is generally required that the manufacturer maintain the pressure for 12 hours. The holding time for different devices can vary; the standard specifies \"a sufficient amount of time,\" with no absolute quantitative value.
Reply to 4# Hei Xiaorou: Your photo looks familiar to me; you must be from Class 1 or Class 2 of the Chemical Engineering program, Class of 2008 at the University of Technology. I’m Xie Yi from Class 3
Some have spot welds that break off as the cylinder becomes round
The jacketed vessels manufactured by our company (which have an inner tube with an outer reinforcement ring in the jacket) produce abnormal noises during the jacket hydraulic pressure test; we are not sure of the reason.
During the hydrostatic test, if abnormal noises are indeed emitted by the container itself, there is definitely a problem; the pressure must be released immediately, and a thorough inspection must be carried out, including the internal and external components as well as their connecting welds!
If an abnormal noise is heard during the test and no other abnormalities are present: 1. Identify the issue – it is a non-pressure-bearing component, and correction is possible; after making the correction, no abnormal noises are heard, and the hydrostatic test is considered successful； b After relieving the pressure from the pressure-bearing components, make corrections and conduct another pressure test. If no issues are found, the equipment is deemed to have failed the hydrostatic test; a new hydrostatic test must be carried out only after the cause of any abnormal noises has been identified and resolved.
The passing criteria for a hydrostatic test are: no leaks, no visible deformation, and no abnormal noises; failure to meet any of these criteria means the test is considered unsuccessful. It just depends on the actual situation to decide whether to reapply water pressure. With your question just now, one can only identify the root cause of the problem and solve it.
There must be no noise; it needs to be checked carefully