Block and Bleed Valves
Block and Bleed Valves
(OP)
Is there any pressure request for installation of double block and bleed valves? It is neccessary to install those valves on the low pressure lines or you can get away with just a block valve and a drain?





RE: Block and Bleed Valves
RE: Block and Bleed Valves
RE: Block and Bleed Valves
RE: Block and Bleed Valves
"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Block and Bleed Valves
RE: Block and Bleed Valves
Now, a designer can choose to provide built-in positive energy isolation for the kinds of things that BigInch mentioned. That is prudent design, not usually mandated.
So for the OP question, install permanent DB&B or not depending on your expected risk profile. It has nearly nothing to do with the design pressure in your line.
David
RE: Block and Bleed Valves
Best regards
Morten
RE: Block and Bleed Valves
David
RE: Block and Bleed Valves
http://www.osha.gov/Publications/osha3120.pdf
http://erd
The OSHA rules have brought out a lot of new style block and bleed valves. We started using the Parker valves after a near hit on two welders, only a small fire no one was hurt.
http://www.spiraxsarco.com/pdfs/sb/p184_10.pdf
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