Sequence of pipeline pressure testing and purging
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I would like to ask fellow sailors: after the pipes are installed in place, should a pressure test be carried out first or purging first? There are discussions suggesting that purging should be carried out after the pressure test is successful. But I have the following questions: 1. A pressure test is conducted first; during short purging periods, some valves and flanges need to be disconnected. So, is it necessary to conduct another pressure test after the purging? Or conduct a leak test? 2. If a pressure test is carried out first, the impurities in the pipeline may also block the pressure gauge or safety valve. How can this be avoided? Please give your guidance. This post was last edited by brightlord on 2009-3-17 14:52]
Why is it necessary to conduct pressure testing first? The main purpose is to determine whether the pipeline system can meet the design specifications and to verify the quality of the construction. Only after approval can the installation begin properly, after which steps such as pipeline purging and airtightness testing are carried out. As for the impurities in the pipelines that you mentioned, they are unlikely to cause blockages in pressure gauges or safety valves, as these components are not installed during pressure testing; instead, short sections are used in their place.
First, thanks to the second floor. The problem is that some valves (reducing valves) have already been installed in the pipes, and they are of the welded type. Is a pressure test mainly used to inspect welds? I wonder if there is any relevant explanation? This post was last edited by brightlord on 2009-3-17 13:49]
Generally, valves also need to undergo pressure and sealing tests, and these tests can be carried out together with those on the pipes; therefore, it doesn’t matter if the valve has already been installed on the pipe. Pressure testing is primarily used to evaluate the quality of the welds; it also checks the pipeline itself to ensure that there is no deformation. Appropriate explanations can be found in the relevant valve inspection standards and pipeline acceptance standards: lol
Could you provide a name or link for the acceptance criteria? I am extremely grateful
Code for Construction and Acceptance of Field Equipment and Industrial Pipeline Welding Projects GB50236; Code for Construction and Acceptance of Industrial Metal Pipeline Projects GB50235
Agree with the view above; pressure testing is mainly used to check the welding quality of pipes. Meters and equipment should not be subjected to pressure testing.