Valve & Pipe Flow Stoppage Problem
Valve & Pipe Flow Stoppage Problem
(OP)
We suspect a line is not capable of flowing its full capacity due to the above ground piping, we have a few pictures but can't share here.
Line is an 8" line and open N/Gas flow through the 4" but we do not know how the 4" above ground piping is tied in. We do not understand why when the valve on the 4" is closed, the flow stops.
Someone has similar experience, please help with this critical operation issue. Thank you.
Line is an 8" line and open N/Gas flow through the 4" but we do not know how the 4" above ground piping is tied in. We do not understand why when the valve on the 4" is closed, the flow stops.
Someone has similar experience, please help with this critical operation issue. Thank you.





RE: Valve & Pipe Flow Stoppage Problem
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Valve & Pipe Flow Stoppage Problem
This same question was discussed within past month.
My guess is that a new 4 in line was installed above ground at some later date than the buried 8 in line. For reasons unknown at this time a decision was made to dead end the existing 8 in and tie into it. Thus, the 8 in is acting as your transport line. The 4 in above ground is your primary supply. The 8 in is no longer supplied from source even though drawings may depict otherwise. Drawings are not always updated to reflect various changes.
RE: Valve & Pipe Flow Stoppage Problem
RE: Valve & Pipe Flow Stoppage Problem
I read your website, it's so interesting. You are very dedicated to explain about pigging operations. I tried to look at the map, map doesn't exist anymore. That is too bad for folks wanted to learn. Do you have another link where I can look at the Pipeline Network in U.S.A. and World.
RE: Valve & Pipe Flow Stoppage Problem
Spain Oil Pipelines,
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Germany
http://ww
You can download an Arcinfo file of the US GOM pipelines here,
http
New gas pipeline projects to Europe,
http:
Mexico,
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I must get a real website....
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Valve & Pipe Flow Stoppage Problem
...please use proper equipment when looking for natural gas lines. My employer has a fairly large natural gas pipeline system, and standard practice is to use a special line locating device (which will either detect a tracer wire or the actual pipe, depending on whether the pipe is plastic or actual metal.), then excavate a maximum distance above the pipe. The remaining soil must be uncovered using handdigging methods (not with sharp objects!), or by using a water-vaccuum truck, to clear around the pipe.
If the pipe is significantly deep, and there is the chance of a worker entering the created pit, shoring may be required to ensure the surrounding soil does not cave in.
If it's possible the pipe is old and leaking, wearing flameproof clothing may be a good idea - I've seen video footage of workers caught in a pit when a small spark lit set the natural gas on fire - not pretty.
RE: Valve & Pipe Flow Stoppage Problem
One other note. If its not your pipeline, call the gas company BEFORE you dig.
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com
RE: Valve & Pipe Flow Stoppage Problem
http://www.pipeliner.com.au/map/map.html
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au
RE: Valve & Pipe Flow Stoppage Problem
Didn't have that one in my collection.
Thanks
Going the Big Inch!![[worm] worm](https://www.tipmaster.com/images/worm.gif)
http://virtualpipeline.spaces.msn.com