Piping test pressure
Thread Content
The hydrostatic test pressure is 1.5 times the design pressure – won’t that cause the pipes to burst?
Typically, the test pressure for pipelines is 1.5 times or higher than the design pressure. This is to ensure that the pipeline can withstand safe operating pressure under normal use conditions. During the testing process, the pipeline is pressurized to the test pressure and then held at that pressure for a period of time to check for any leaks or deformation. If the pipeline is properly designed and of good quality, it will not burst. However, if the pipeline has design flaws, quality issues, or improper construction, it may pose safety risks. Therefore, when conducting pipeline tests, it is necessary to follow relevant standards and specifications strictly, and to ensure the use of appropriate tools and equipment in order to guarantee the safety of the testing process. .
There are only two possible explanations for cracking: either there is a problem with the design – issues with the design parameters or the selection of pipe wall thickness – or it’s a problem with the material itself, issues related to manufacturing, or reduced wall thickness due to cutbacks in quality
First, the allowable stress when calculating wall thickness is generally 2/3 of the standard minimum yield strength; in addition, a certain amount of rounding is applied when selecting the wall thickness. Newly installed pipes may also have a corrosion margin, and during all hydrostatic tests, the stress level in the steel pipes will not exceed 90% of the standard minimum yield strength (as required by standards)； Secondly, as long as it is a qualified product, the actual yield strength of the steel pipe is greater than the standard yield strength; therefore, the pipe hardly reaches its yield state during hydrostatic testing.
As long as it is a qualified product, it won’t explode; after all, the standards are set in this way based on data
What do you say after the calculation? If it breaks, then it’s not up to standard, right?
The hydrostatic test pressure for thin-walled stainless steel sanitary pipes exceeding 10 bar may cause the pipes to burst; it is necessary to verify the maximum allowable pressure for the pipes and fittings.
Piping pressure testing is completely different from equipment pressure testing. According to the standard design, there should be no problems.
The allowable stress of materials used in pipeline design includes a safety factor; as long as the materials are of qualified quality, there will be no problems
Each standard has its requirements; generally, the test pressure should not exceed 95% of the pipeline’s minimum yield strength, and this value may vary depending on the different specifications
Under normal circumstances, you should be happy if it breaks; if you purchase a substandard product, you can request a free return.