Threaded joint leakage is most often due to fabricators making thread cuts
too long on the pipe ends. Also, they may be using worn out thread cutters.
Cutters for stainless steel should be changed often, as they tend to wear
out quickly. You should require the suppliers and fabricators to demonstrate
suitable workmanship. Else you will just have a lot of rework. I have seen
jobs where the project manager required the leakers to be welded up. The low
pressure-rated fittings and valves often have shallow thread depth and will
not allow off-spec male ends to insert enough to make leak-tight seal (and
pipe dope may not stop these leaks).
Ben
-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=x3dUMlzAx7a3fzeiLsE3HO2WqCAnktQY15qdcJNJiWxt953v4twDp-dDwS8SKQQdfZNRxnfnmHLOLBMoM12tb4-B">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=x3dUMlzAx7a3fzeiLsE3HO2WqCAnktQY15qdcJNJiWxt953v4twDp-dDwS8SKQQdfZNRxnfnmHLOLBMoM12tb4-B">PipingDesign@yahoogroups.com</a>] On
Behalf Of Rakesh Patil
Sent: Tuesday, June 28, 2005 10:58 PM
To: <a href="/group/PipingDesign/post?postID=x3dUMlzAx7a3fzeiLsE3HO2WqCAnktQY15qdcJNJiWxt953v4twDp-dDwS8SKQQdfZNRxnfnmHLOLBMoM12tb4-B">PipingDesign@yahoogroups.com</a>
Subject: Re: [PipingDesign] Thread Sealant
You are correct christ. Actually some of the threaded fittings / flanges available are not having proper threads which may lead to leakage. To avoid it, we need to have a sealant that can restrict leak and will give good results.
So please suggest me.
Christopher Wright <chrisw@skypoint.com>
Sent by: <a href="/group/PipingDesign/post?postID=x3dUMlzAx7a3fzeiLsE3HO2WqCAnktQY15qdcJNJiWxt953v4twDp-dDwS8SKQQdfZNRxnfnmHLOLBMoM12tb4-B">PipingDesign@yahoogroups.com</a>
06/28/2005 07:24 PM
Please respond to
<a href="/group/PipingDesign/post?postID=x3dUMlzAx7a3fzeiLsE3HO2WqCAnktQY15qdcJNJiWxt953v4twDp-dDwS8SKQQdfZNRxnfnmHLOLBMoM12tb4-B">PipingDesign@yahoogroups.com</a>
To
<a href="/group/PipingDesign/post?postID=x3dUMlzAx7a3fzeiLsE3HO2WqCAnktQY15qdcJNJiWxt953v4twDp-dDwS8SKQQdfZNRxnfnmHLOLBMoM12tb4-B">PipingDesign@yahoogroups.com</a>
cc
Subject
Re: [PipingDesign] Thread Sealant
On Jun 28, 2005, at 5:50 AM, henry castro wrote:
> Fluid working temperature must also be given emphasis in choosing the
> right thread sealant to be used.
Pressures like this with air or nitrogen shouldn't require sealant.
Pipe threads under these circumstances are self sealing provided the
threads are made properly. If the threads aren't made properly make
them so.
Christopher Wright P.E. |"They couldn't hit an elephant at
<a href="/group/PipingDesign/post?postID=GCqf7kn4Q5Uk04wXc5Ti14XdlWcgz-OChhinNzBv9z0ZZIMOrleEpTk1XwJ2CynYHi56Mh31IAPkFPB95A">chrisw@skypoint.com</a> | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania1864)
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