What is the maximum pressure for pipeline hydrotesting that you have encountered?
Thread Content
A high-pressure superheated steam pipeline leading from the power plant, with a design temperature of 545°C and a design pressure of 9.81 MPa; the material used is 12Cr1MoVG--GB5310. Designed as a GC-class pipeline, its hydrostatic test pressure is 43.3 MPa. This is the first time such high pressure is applied, and there are concerns that it may cause physical damage to the pipeline, yet it is necessary to comply with the standards. I would like to ask if there is any problem with doing this? I wonder what the highest hydrostatic test pressure you have encountered is? Additionally: GB5310 stipulates that the outlet water pressure of pipes should not exceed 20 MPa. Can the water pressure in actual projects exceed 20 MPa? If the pipeline is designed as a GD-class pressure pipeline, its hydrostatic test pressure (which is actually a tightness test) is only 16.2 MPa; the differences among various industry standards are quite significant.
Flange class CLASS 2500.
Calculate what the hydrostatic test pressure is, and then see if the difference is significant; is such a high pressure required just to relieve stress?
Per specifications: For GC pipes, the hydrostatic test pressure is 44.3 MPa； If classified as a GD pipeline, the hydrostatic test pressure is 16.3 MPa.
The pressure test must be verified in accordance with GB50316; the value shall not exceed a certain percentage of the material’s stress at room temperature