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Re: [MW:33067] Hydrotesting of piping with Dual plate check valve mounted

By Materials & Welding
Thanks for the reply.Its a spring loaded sandwich type NRV,so it'll be difficult for filling and draining/venting etc.



On Mon, 9 May 2022 at 14:22, Lakshman Kumar <lakshmankumar4@gmail.com> wrote:
Hi,
If your valves are capable of holding the test pressure, no need to remove from the pipeline,
Also one should not take advantage of the valves saying leakage at spindle / pinions / gaskets / etc.
Further valves should not get damaged during / after testing, as it has to be in useful condition after testing also.
Ensure that the valves should not partition / separate / isolate the line during testing or pressurization time, especially check valves / NRV should allow the flow during pressurization time (means pressure  pump should be on the upstream of the NRV) and also ensure to place pressure gauges at the downstream of the NRV to ensure that the line is fully pressurised 

Thanks & Regards,
Lakshman kumar B
+91 9440031459.


On Mon, 9 May 2022 at 08:53, 'Ajaykumar A' via Materials & Welding <materials-welding@googlegroups.com> wrote:
Hello All,
I need to do hydrotest of piping systems with wafer type dual plate check valves fitted. Do they all be removed for testing? The issue I am facing is, since they are sandwiched types, there is no enough space to fit dummy spools.
Kindly assist.

Thanks and Regards,
Ajay

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