I would like to ask everyone, if the gasket is selected according to the design pressure, the hydraulic test pressure exceeds the nominal pressure of the gasket. Will this situation have any impact?
Thread Content
The design pressure is 10Mpa. The selected class600 gasket has a water pressure of 12.5Mpa, which exceeds the nominal pressure of the gasket. In this case, should the gasket be selected to a higher grade?
The hydrostatic test exceeding the nominal pressure of the gasket may cause the gasket to be deformed or damaged, thereby affecting the sealing effect. If this situation only occurs during pressure testing and does not exceed the nominal pressure of the gasket during operation, there is no need to replace the gasket with a higher grade. However, if in actual use, the system working pressure will often approach or exceed the nominal pressure of the gasket, it is recommended to use a higher grade gasket to ensure sealing performance and safety. At the same time, when selecting gaskets, the pressure test situation should also be considered and the appropriate gasket grade should be selected. -
No problem, no need to be fussy.
This post was last edited by AtlantisH on 2023-3-11 08:05 Flanges, fasteners, and gaskets are all selected according to the same pressure level. They do not match the same nominal diameter and different pressure levels.； The gaskets used during the hydrostatic test must be replaced with new ones.
The design pressure of an equipment in the factory is 10. The flange and gaskets are selected according to CLASS600. The Class600 gaskets used in the hydraulic pressure test were torn and flew away when the water pressure reached 8Mpa. It is not clear whether it is a quality issue with the gaskets or if the grade was selected too low.
What material is the gasket made of and what is its standard number?
RSB, HG20627
It is recommended to choose a higher grade gasket.
“The design pressure is 10Mpa, and the selected class600 gasket is the wrong gasket. Class900 gaskets should be selected.