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Valve Pressure Barrier

process safety valve

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#1 rikakose

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Posted 16 July 2019 - 09:51 AM

Two systems are at different pressure 8 barg and 2 barg. Two systems are separated with a block valve (diaphragm valve manual) PN16 same as the piping system (10 barg @ 120 C) 

 

I got a question: the pressure difference is too much, diaphragm valve is not good enough. In my opinion, as long as the valve is PN 16, it should be able to take 10 barg @ right temperature. The pressure difference is not a issue. But I didn't find information regarding to question. 

Hope someone can help. 

 

Thanks in advance. 

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Edited by rikakose, 16 July 2019 - 09:51 AM.


#2 thorium90

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Posted 16 July 2019 - 10:45 AM

What do you mean by "is not good enough"

As in you think it will leak?

Presumably would have something like a Class IV leakage designation would it not?



#3 rikakose

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Posted 19 July 2019 - 04:05 AM

What do you mean by "is not good enough"

As in you think it will leak?

Presumably would have something like a Class IV leakage designation would it not?

Thanks for the reply. 

Sorry I didn't make the story more clear. 

Some of the equipment in the low pressure system has no safety valve. Normal hand valve (ball/gate/globe) failure factor is 1X10-4. People from operation think diaphragm valves have higher failure rate because of pressure difference. I couldn't find any document referring to this concerns. 



#4 breizh

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Posted 19 July 2019 - 06:27 AM

Hi ,

Thanks to explain why you install this type of valve !  To me it's not an isolation valve , more a throttle valve .

Here you have two issues :

       the type of valve and the lack of protection of the equipment downstream the valve .

 

 A better description of your process is welcome .

 

Breizh






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