RE: (unknown)

From: <Steve>
Date: Thu Sep 11 2003 - 07:46:00 EDT

Hi Adolphus

how does one establish that a line is piggable? I presumed that provided that the clean ID is fairly constant, there are no transverse mechanical obstructions, the bends are easy and the pipe wall is strong, then things are sweet. Are there some other things to take into account? The time and cost/availability of running an intelligent pig through the line first probably rule it out.
Will probably go with the suggestions on a smaller 8" (pilot?) water driven pig going uphill first and compressed air at the top of the hill just in case.
On the line portion causing the problem, there are no valves. I intend breaking into both ends of the troublesome line. However today I found out the line is buttstrap jointed, not butt welded. Would be surprised if this is an issue although the pig may get a shave on the way through. The water source is from mountain streams so the solids will be mainly scale and detritus, with a bit of organic matter chucked in for good measure. Not expecting any major environmental issues provided we contain and dispose.

However I have a feeling I will need all the luck I can get.

Thanks for your thoughts

Steve McKenzie

-----Original Message-----
From: adolphus omodu [mailto:aomodu@yahoo.com] Sent: Thursday, September 11, 2003 10:55 PM To: <a href="/group/PipingDesign/post?postID=vH21hCJ1tnAybnqRX8xIiUaVY0uA-NQHD89_UjGcTBy8iKwzusfMw0rsWlAgY9-F6HFgH9YXjobI387OYLWC-5ESrtujRw">pipingdesign@yahoogroups.com</a> Subject: [PipingDesign] (unknown)

Hi steve,

I will suggest two things first to be done before considering pigging that 10"steel line with 3/8" w.t. Please try and get the old piping drawings and find out whether:
1. the steel pipeline system is a piggable one. 2. the type and spec. of valves on the line.

The moment you confirm that the line is a piggable one, you just run an intelligent pig through it and that will gather a lot of information on the current state of the line, especially the depleted wall thickness all through.

Finally, with this result you will then be in a safer position with the contractor to pig the entire line(usally the direction of flow is preferred).

Also, make sure you have settled with the EPA GUYS to avoid litigation.

CHEERS and best of luck,

Engr. Adolphus Omodu

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Information presented on this list is given as helpful advice, nonsense, carefully-considered calulation or any combination of the above. The intent is to spark discussion and encourage knowledge-sharing amongst professionals. If you blow yourself up by doing stuff remotely described by info gleaned from reading this list, you are an idiot.

Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Thu Sep 11 07:46:00 2003