Re: minimum base metal thickness for hot tapping

From: <D>
Date: Sun Apr 18 2004 - 02:24:00 EDT

Mr Tanmoy,
It is the Pressure thickness which you need to check to which you need to add 2.4 mm to avoid burn-through. However, another clause in Standard practice is that minimum of 3/16" thickness to be available for performing Hot Tap. Thickness check is done by UT check at different locations at Hot Tapping point, more importantly at the locations where the Split Tee (Used for Hot Tapping) welds onto the main pipe. Usually the existing pipe supports would be sufficient to take the Hot tapping machine load. Requirement of additional supports can be judged at site and more so along with the Hot Tapping Vendor.
with regards
DKMRAO
-----Original Message-----
From: TANMOY SABUD [mailto:tsabud@yahoo.com] Sent: Sat, April 17, 2004 9:19 AM
To: piping
Subject: [PipingDesign] minimum base metal thickness for hot tapping

Dear members

As per API RP-2201 (refer clause 3.4) the actual minimum base metal thickness for a hot tapping is a “function of the thickness required for strength, plus a safety factor, usually 2.4 mm, to prevent burn through.”
Now what does it mean by “strength”? Is it the strength to sustain the internal pressure? Or is it the strength to sustain the load generated during hot tapping? Or is it both?
If it is both, then how we can calculate the load generated during hot tapping operation and also the required thickness.
I want the valuable suggestion from the group.

With best regards
Tanmoy sabud

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