ASME Pipe Repair to Elbow by full encirclement sleeve PCC-2
ASME Pipe Repair to Elbow by full encirclement sleeve PCC-2
(OP)
I have a 26" elbow that is in an extremely difficult place to remove and no pipe supports for the rest of the hanging pipe. Thickness was measured at .205" with a required thickness of .06" but typically we want a thickness of 0.100" for structural purposes. I do not want to run into a issue in the near future for a pinhole or further thinning. Can I use a full encirclement steel reinforcing sleeve for the elbow as depicted in ASME PCC-2 Article 2.6. What is the best way to fabricate a sleeve? Is this allowed for an elbow?





RE: ASME Pipe Repair to Elbow by full encirclement sleeve PCC-2
I doubt if a full encirclement clamp can be made for an ell, too many compound curves to match. One of the engineering assumptions for Full Encirclement is that there is a high percentage of contact surface between the clamp and the existing fitting/pipe.
If the ell is installed, I would beef up the heel of the ell [done that, successfully]. Use an ell of the same size, cut out an oval and press the oval until it has opened up enough to fit the installed ell 'like a glove'. That oval should cover from a couple of inches short of the pipe welds, and at least 120° of the heel of the ell - extrados. Further, since the Flow-Accelerated-Corrosion FAC of pipes at ells tends to be on the pipe, just past the ell, I would also put a 120° - 175° encirclement on the downstream pipe, about 1½ to 2 pipe diameters long. Saw / torch some 1 to 1½" diameter plugweld holes in these patches, to give them structural strength. The perimeter fillets really only handle pressure.
Buy the fab crew another, new 26" ell to test-fit against in the shop, before they take the patch to the field.
ps - if you use this bit of experience, a star would be nice.
RE: ASME Pipe Repair to Elbow by full encirclement sleeve PCC-2
RE: ASME Pipe Repair to Elbow by full encirclement sleeve PCC-2
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