Plug valves
Plug valves
(OP)
Hi, I am new here. I need some information regarding plug valves. Can they be used in compressed air pipeline (100NB, 8 bar)? Thanks in advance for the advice.
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RE: Plug valves
Plug valves are normally not used in the main pipeline, because of their flow pattern and historic sticking problems.
They have found more service in lateral connections off the mainline where frequent use and finer flow control for blowdown or throttling is needed.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Plug valves
David
RE: Plug valves
No - I'm not a plug valve peddler. Like zdas04, I also have a preference for ball vavles.
donf
RE: Plug valves
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Plug valves
David
RE: Plug valves
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Plug valves
http://www.bch.dk/index.php?page=double-plug-valve
They have been used extensively in the Danish NG network, e.g. at plants where extensions with parallel trains called for DBB. Here these valve can give true DBB but they have the same build length as a std. ball valve. Im not working for this outfit - or selling their product but they have been recommended to me by persons i trust.
But i think that you should remember that sometimes you get what you pay for - there are many manufactores out there and they service many markets. Some may be too expensive - some too cheap for your purpose.
Best regards
Morten
RE: Plug valves
In terms of "true double block and bleed" that term is not very well defined anywhere. My interpretation of such definitions as I've seen is that a Trunnion Ball Valve fits the definition at least as well as this valve and has resilient, spring-loaded seats.
I'm pretty sure that a large proportion of valve choices are based on policies instead of an analysis of the problem being solved. Far too many companies would rather have a policy than allow a decision. In that kind of environment this sort of discussion is just noise into the wind.
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
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RE: Plug valves
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Plug valves
For the plug valves here shown the clearance is not fully symmetrical. There is no reduction on the vertical axis - but a larger reduction on the horz. axis compared to a ball valve (see drawing on page A3 in the catalouge). So im not sure its that bad. As i said i know a nomber of installations where they have been retrofitted because they have the standard size.
I think we have been over the DBB issues before
Best regards
Morten
RE: Plug valves