PatWHendersen
Materials
- Oct 27, 2014
- 2
Hello
Can anyone tell me if there is a standard for the minimum pressure testing required fo Emergency Shut Down Valves, Blowdown Valves, HIPPS & risers as a final assembly?
I'm finding that some manufacturers state that pressure testing is required for the full assemblies and once tested should not be disassembled eg for painting of the valve.
Other manufacturers at the other end of the scale are happy to present a procedure showing full pressure testing of the bare stem valve with a full Dp stroke test performed on the aseembly and then disassembly for painting with only a dry stroke test required on re-assembly.
The first scenario seems a much more stringeent test and more reliable test of the assembly's integrity.
Those offeriong the seperate testing state that valves can't be painted once assembled with actuator and controls due to possible damage of these units. Thesy can size andd these intricate peices of pressure, torque and mechanical function... just not paint them???
Both can't be right though.
Is there an international or industry standard to guide this?
Any help on the suject would be greatly appreciated.
Thanks and best Regards
Pat.
Can anyone tell me if there is a standard for the minimum pressure testing required fo Emergency Shut Down Valves, Blowdown Valves, HIPPS & risers as a final assembly?
I'm finding that some manufacturers state that pressure testing is required for the full assemblies and once tested should not be disassembled eg for painting of the valve.
Other manufacturers at the other end of the scale are happy to present a procedure showing full pressure testing of the bare stem valve with a full Dp stroke test performed on the aseembly and then disassembly for painting with only a dry stroke test required on re-assembly.
The first scenario seems a much more stringeent test and more reliable test of the assembly's integrity.
Those offeriong the seperate testing state that valves can't be painted once assembled with actuator and controls due to possible damage of these units. Thesy can size andd these intricate peices of pressure, torque and mechanical function... just not paint them???
Both can't be right though.
Is there an international or industry standard to guide this?
Any help on the suject would be greatly appreciated.
Thanks and best Regards
Pat.
