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API 570 Temporary Repairs

API 570 Temporary Repairs

API 570 Temporary Repairs

(OP)
API 570 states that “Temporary repairs may remain in place for a longer period of time only if approved and documented by the piping engineer.”  Assuming a full encirclement sleeve has been designed for appropriate stress conditions, can “longer” be considered to be the life of the enclosed pipe?

The reason I pose the question is that hot taps are routinely installed on pipe using full encirclement tees and are typically considered permanent fittings.  It seems to me that a pipe sleeve is essentially a split tee without the branch connection.  In many cases, a piping system cannot be isolated without shutting down the entire refinery or installing stopples and bypasses (split tees).

I am interested to hear if anyone else has dealt with this issue at their refinery.

I appreciate any comments.
John

RE: API 570 Temporary Repairs

Why does the sleeve need to be installed in the first place?

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: API 570 Temporary Repairs

(OP)
Good question.

Good answer as well.

It makes sense to base the life on the known corrosion rate and inspect on the half life.

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