Discussion: The design pressure for the pressure vessel is 1.0. According to national standards, a hydraulic test pressure of 1.25 times this value is required, but the customer insists on a pressure that is 1.5 times higher.
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I met a client today with a design pressure of 1.0. The required experimental pressure is 1.5. According to calculations, a shell with a thickness of 6 mm should be sufficient, but the actual experimental pressure is not high enough. After communicating with the customer, they informed us that their pressure pipelines use tubes with a thickness of 6 mm and requested that we use shells of the same thickness as well. What should we do in this situation?
The selection of pressure and wall thickness for the design of pressure pipelines and pressure vessels should be different.
Is thickening the only option? What will be the effect if only the thickness is increased? Please discuss this
The test pressure was not met, so the thickness was increased.
In that case, the total load capacity increases
What’s the diameter of yours? Because of the test pressure, increasing the wall thickness in turn – that approach isn’t correct
Can you upgrade the steel grade from 235 to 355 or something like that?
Our company only uses 304! If making changes, Q345R could be considered, but since the customer has specified this, there’s nothing we can do!
When increasing the test pressure, the requirements for strength calculation as specified in GB150 must be met.