Is gas pressure testing applicable?

A pressure of 0.6 MPa should be sufficient; before inflating, check to ensure that the design pressure of the pipes meets the requirements and that all flange bolts on the pipeline are tightened. The inflation process is slow; do not approach areas where the pipes are prone to bursting. The main concern is some minor mistakes, such as installing only 2 out of the 4 bolts on a flange, or performing spot welding on a certain elbow without completing the welding process – these kind of extreme situations. A little air leakage under normal conditions is not dangerous

Pressure testing can be carried out using nitrogen; there are no special requirements from a technical standpoint. It should be noted that for pressure testing at least two gauges are required, and both of them must have passed their regular inspection

Apply soapy water to each weld to check for bubbles and such?

Is it necessary to apply soapy water to each weld and check for bubbles or something like that?

Welds, flange ends, equipment interfaces, and so on all require bubble tests. Since they are less sensitive to air pressure, unlike water pressure where the effects are more obvious – a slight leak results in a significant drop in pressure – if there are small defects, the pressure drop in those areas is usually still within acceptable limits. Therefore, it is recommended that you conduct bubble tests. Large flange ends can be sealed with tape and a hole made in them; when performing air pressure tests, attention must be paid to the influence of temperature, as the temperature differences at the start and end of the test should not be too large

This post was last edited by A window that won’t close_KEIQ on 2018-5-9 at 10:35. Generally, the construction company will provide a pressure testing kit; you need to check this kit and verify its contents. It mainly depends on how the contract is drafted, but usually it is the construction company that carries out this task, with the process being checked and confirmed thereafter. Looking at these specifications, 1) the pressure testing and sealing tests of the pipeline valves prior to installation can be carried out by the construction party itself; these tests must comply with the requirements specified in the construction and acceptance standards indicated in the construction drawings. It is recommended to refer to the relevant provisions of GB50235-97 \"Code for Construction and Acceptance of Industrial Metal Piping Projects\" and SH3501 \"Code for Construction and Acceptance of Piping Projects for Toxic and Flammable Media in Petrochemical Industries\", which specify in detail the specific requirements for valve testing, the scope of testing, as well as the valve testing reports (records). 2. Since the installation of pressure pipelines requires corresponding installation qualifications, as long as the contractor has the qualifications for pipeline installation, separate valve testing qualifications are not necessary. 3. In accordance with the relevant provisions of TSG D2001-2006 \"Rules for Licensing the Manufacture of Pressure Pipeline Components\", manufacturers of valves to be installed on pressure pipelines must possess the appropriate licensing for the manufacture of such pressure pipeline components.

For gas pressure testing, it should be at least 0.66 MPa, right? That’s already above the limit