To the best of my knowledge, it is not prohibited to weld a pad or a saddle on a weld.
You may check in chapter 382.5 and more particularly in 328.5.4.
Check 341.3.1 for inspection requirements
best regards
Dr. Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE
Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
Hafiz Ali Alvi ---14/07/2015 07:00:19---Deal All, I have a question about Overlapping of RF Pad With an Existing Weld Joint.
From: Hafiz Ali Alvi <alimalvi300@hotmail.com>
To: Materials Group Welding <materials-welding@googlegroups.com>
Date: 14/07/2015 07:00
Subject: [MW:23156] Overlap of reinforcement pad with existing pipe circumferential Joint
Sent by: materials-welding@googlegroups.com
Deal All,
I have a question about Overlapping of RF Pad With an Existing Weld Joint.
We have a situation where hot tapping (NPS 36) to be performed on existing NPS 60 hot flare header. The branch connection was specified as Stub On with Reinforcement Pad as per ASME B31.3. There was a note specified on the ISO drawing to verify the hot tap location before executing the job. The contractor (perhaps overlooked the ISO note) weld the NPS 36 branch pipe and when they were about to weld reinforcement pad, they notice the reinforcement pad overlap with existing pipe weld.
Now the contractor has proposed to reduce the reinforcement pas width to 60mm to avoid overlapping with existing weld. I need you opinion on this proposed solution. Can we accept it.
What can be other possible solution keeping in view the welding requirements.
Design Code : ASME B31.3
Pipe Material : ASTM A672
Design Temp. 180 deg C
Design Pressure : 3.5 kg /cm2 g
Corrosion Allowance : 3.2 mm
Header WT: 15.3 mm
Header size : 60 inch
Branch size : 36 inch
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