Questions regarding the description of pressure stabilization time in the specifications
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Gentlemen, I have a question that has been bothering me for a long time. In Cjj33-2005, the requirements regarding the pressure testing for urban gas pipelines state: \"12.3.8 During the strength test, the pressure should be increased gradually. It should first be raised to 50% of the test pressure, after which an initial inspection should be conducted. If there are no leaks or abnormalities, the pressure should then be increased to the test pressure. After that, the pressure should be held constant for 1 hour, and the pressure gauge should be monitored for at least 30 minutes; no drop in pressure indicates that the test is successful.\" ” It states that the stabilization time is 1 hour, after which the pressure gauge should be monitored for at least 30 minutes. My understanding is that the stabilization time actually amounts to 1.5 hours; however, in many cases, it is considered acceptable if there is no drop in pressure within 1 hour, or it is explicitly stated that as long as no drop in pressure is observed during the stabilization period, then everything is fine. So how should this last sentence in the standards be interpreted? Should the monitoring of the pressure gauge take place during the stabilization period or after it? And what is the practice in domestic urban gas projects regarding this? Solve
In the CJJ33-2005 standard, the requirements regarding the pressure testing for urban gas pipelines can be explained as follows: 1. First, the pressure is increased to 50% of the test pressure for an initial inspection; if there are no leaks or abnormalities during this initial inspection, the pressure can then be increased further to the test pressure. 2. The stabilization time refers to the period of 1 hour during which the pressure is maintained at the test pressure after it has been reached, after which the pressure gauge is checked again. During the observation period, the pressure gauge should be maintained for no less than 30 minutes without any drop in pressure. According to the specifications, the stabilization time is 1 hour, and the observation period is 30 minutes. In general, the requirement outlined in the specifications is to monitor the pressure gauge during the pressure stabilization period, and the pressure gauge should remain stable for at least 30 minutes without any drop in pressure. However, in practical engineering applications, there may be certain targeted measures or special circumstances that require adjustments when carrying out pressure testing. Therefore, the specific methods of application and implementation may vary. To ensure safety and quality, you can consult relevant industry experts or follow local industry standards and regulations when carrying out town gas project work. .