Check valve located into piggable portion of a pipeline
Check valve located into piggable portion of a pipeline
(OP)
ASME B31.4 state as mainline pipelines: all in-line pipeline pipes, fittings, bends, elbows, check valves, and block valves between scraper traps.
So it is a good practice to install a check valve (swing check valve)in a pipeline when pigging is required?
thanks to all
So it is a good practice to install a check valve (swing check valve)in a pipeline when pigging is required?
thanks to all





RE: Check valve located into piggable portion of a pipeline
RE: Check valve located into piggable portion of a pipeline
Cheers,
John
RE: Check valve located into piggable portion of a pipeline
Beware of mainline check vavles and the use of some pigs, as some check valve cavities are so large, that a pig will not "bridge" through it very well, and may get stuck, or let bypass around the pig and stop.
RE: Check valve located into piggable portion of a pipeline
This was a Gathering example, but I can recall when a line built to take gas from the San Juan Basin to Texas was repurposed to take Permian gas to California. Check valves would have increased the cost of that repurposing significantly.
This is the same reason that the pig launchers I design look exactly like the pig receivers I design. I can't find any reason that they have to be different, and making them the same has saved my bacon a few times (Marketing's "creativity" caused flow in a line to reverse and my launchers became receivers and vice versa).
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
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RE: Check valve located into piggable portion of a pipeline
RE: Check valve located into piggable portion of a pipeline
[A valve must be installed]On each side of a water crossing that is more than 100 feet (30 meters) wide from high-water mark to high-water mark unless the Administrator finds in a particular case that valves are not justified.
I don't interpret this as allowing a check valve, nor would I suggest that. A full port ball valve would be my suggestion here.
RE: Check valve located into piggable portion of a pipeline
This is one of the better manufacturers and personally I wouldn't think of using any other, http
"The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward X-CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Check valve located into piggable portion of a pipeline
"The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward X-CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Check valve located into piggable portion of a pipeline
RE: Check valve located into piggable portion of a pipeline
Be sure that your check valve is full piggable only.
RE: Check valve located into piggable portion of a pipeline
"The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward X-CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Check valve located into piggable portion of a pipeline
RE: Check valve located into piggable portion of a pipeline
"The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward X-CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com