maximum size of hot tap branch on 32" line
maximum size of hot tap branch on 32" line
(OP)
Hi
We are considering hot tapping a branch connection to a 32" x 20.6mm THK pipeline.
what is the largest branch size applicable? is it possible to make an equal connection?
thanks,
Ashkan
We are considering hot tapping a branch connection to a 32" x 20.6mm THK pipeline.
what is the largest branch size applicable? is it possible to make an equal connection?
thanks,
Ashkan





RE: maximum size of hot tap branch on 32" line
You do not say where you or this project are located or if you have contacted and had discussions with a reputable and qualified Hot-Tap Contractor.
Talking to an expert is your first step then the rest is in the details.
Sometimes its possible to do all the right things and still get bad results
RE: maximum size of hot tap branch on 32" line
RE: maximum size of hot tap branch on 32" line
thanks for your attention.
it is a 32" x 20.6mm THK 600# sour gas service, design code asme B31.8 in Iran.
we are at early stage of decision making regarding making a hot tap or cold cut. as reduced size connection will lead to lower flow to the branch line, I need to know if it is possible to make hot tap connection equal to run pipe? or what is the biggest connection possible?
by the way, the contractor have suggested 26" hot tap connection, which we are not convinced with such reduction in size.
I'll be thankful if you share me your experience in this regard.
thanks
RE: maximum size of hot tap branch on 32" line
A 26" hot tap on a 32" pipeline with the wall thickness you gave (guessing at the thickness required for the 26" pipe and how big of a coupon a hot tap machine could take out) should leave you with a beta ratio of about 0.78. That's about the upper end that my instrumentation people like to size an orifice meter for, have you done any calculations to see if the pressure drop (I assume that is your concern) really is a problem? If that is the issue, hot tap a 26" tie-in and then increase to the 32" or whatever size you want to run.
From a safety point of view, I would also prefer to take the line out of service and do a cold cut and weld in my tie-in.
http://www.ogj.com/articles/print/volume-99/issue-...
Lot smaller pipeline than you are talking about but it discusses some of the issues they faced.
RE: maximum size of hot tap branch on 32" line
RE: maximum size of hot tap branch on 32" line
The minimum pipe schedule, type of piping material, and the orientation of the tapping machine must also be evaluated. Only an experienced hot tap vendor will be able to look over the scope and tell you if it is feasible. Call one of the hot tap vendors: TDWilliamson, TBL, Claxon, or Plidco.
RE: maximum size of hot tap branch on 32" line
I think it's better to make cold cut for that equal branch out.
thanks again for your attention