Hydrostatic test of pressure vessels in service
Thread Content
Dear friends, I would like to ask a few questions about whether pressure vessels in service should be hydrostatically tested. Thanks! 1. In addition to the statutory (renovation or major repair or regular inspection deemed necessary) hydraulic pressure test is required for in-service pressure vessels, should a hydraulic pressure test be performed for routine maintenance (especially high-pressure vessels) such as replacement of gaskets? 2. If we do not perform hydraulic pressure testing during daily maintenance, what other inspections/tests will we do? 3. If a hydraulic pressure test is performed, is the test pressure calculated based on the working pressure, the maximum working pressure, or the design pressure? 4. Will frequent hydraulic pressure testing cause damage to the container or other effects?
#Quick reply here# Frequent hydrostatic testing may indeed cause damage to the container. The main risk is inducing material fatigue cracks and residual deformation, but a single standardized operation is a non-destructive test. .
Thank you very much, Teacher Wang, for your answer! I would also like to ask whether fatigue cracks will also be induced if the hydraulic test is conducted based on the working pressure instead of the pressure calculated based on the standard specification design pressure, and the test frequency is 2.5 years/time.
This post was finally written by wlmq_Edited by dj on 2026-7-5 11:43 It is safe if the pressure of the pressure test does not exceed the design pressure, no matter how many times or how long it is done. But usually the pressure of the pressure test is 1.25 times the design pressure, and the pressure holding time is controlled for half an hour. This situation has an impact on the container.