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Comment on this..
(OP)
Say i have a PSV provided for a system in which the rated flowrate of the PSV is 10 times bigger than the required sizing flow rate.Ultimately my inlet and outlet pressure drop are not within the code limits.In this case is there any possible solution available other than going for a smaller size PSV or modification of PSV including Bellows,pilot,remote pilot.can i comply for codes with the available system ???
Remember my pressure drops are very high of order say 70-80% of the set pressure.So changing pipe size is not helping me that much and my valve is full lift type.
please help me out..................
Remember my pressure drops are very high of order say 70-80% of the set pressure.So changing pipe size is not helping me that much and my valve is full lift type.
please help me out..................





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I2I
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I still don't understand why you have large PSV with small relief load... there are so many practical problems associate with this arrangement... Code compliance is just on paper...
JoeWong
Chemical & Process Technology
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on 1st option - is it possible to fix a custom made orifice in a existing device(PSV)???
2nd option - what do you mean by split load ???the problem i am facing here is the sizing flowrate is very less when compared to device rated flow.
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I2I
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great reply..........Yeah i know i am screwed and if it is a liquid service we can apply square law.i escpaed by this on couple of devices.
cheers...........
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yes i agree with you.....My system is not safe.
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Is partial modification of exisiting PSV acceptable from code and authority viewpoints ?
Who dare to certify correct Kd factor for a modified PSV ?
If answer is vendor, check with vendor if they are willing to...also check the cost...
After modification, is the PSV API or ASME compliance ?
Is the modification cost is lower than replace a small PSV ?
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JoeWong
Chemical & Process Technology