Hot tap at a pipe butt weld
Hot tap at a pipe butt weld
(OP)
We were going to hot-tap a new 12" branch into an existing 24" on-site (non DOT) fuel oil pipe line. When we removed the pipe insulation we found a butt joint right there. The line can't be taken out of service for a tee and we can't move the tap because of other interferences. The solution proposed is to weld on a split tee, then flange the tee and drill into the 24" pipe. The question is: does B31.3 allow or dis-allow this? Thanks...





RE: Hot tap at a pipe butt weld
RE: Hot tap at a pipe butt weld
RE: Hot tap at a pipe butt weld
Just my thoughts,
John
RE: Hot tap at a pipe butt weld
RE: Hot tap at a pipe butt weld
If it is not possible to radiograph, I wonder if the code might permit other forms of examination such as UT ?
RE: Hot tap at a pipe butt weld
There would seem to be some wriggle room anyway in para 341.4.1(b)(1), in its reference to para 344.7, which basically allows visual examination to be undertaken. You know the job though, and how comfortable you would be with that.
RE: Hot tap at a pipe butt weld
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Hot tap at a pipe butt weld