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Technical Discussions
Rigzang Tashi
Punatsangchhu-I Hydroelectric Project Authority, Bhutan, Joined Aug 2015, 12

Rigzang Tashi

Punatsangchhu-I Hydroelectric Project Authority,
Joined Aug 2015
07:43 Oct-10-2015
Root gap and weld quality

1. It is found practically difficult to maintain a root gap of Single V-butt joints in fabrication and erection of heavy thickness (100mm) Bifurcations pieces (Y-pieces) in steel lining of hydropower pressure shafts. As per standard, a root gap should be maintained atleast 3mm. But, the root gap comes to 10mm. In this regard, i seek clarification whether such more root gap in any kind of weld joints will affect the weld quality and how quality of weld will get affected?
2. What are the criteria and standards tell us whether to conduct UT test of a pipe shell from inside or outside of a pipe?

Anmol Birring
Birring NDE Center, Inc., USA, Joined Aug 2011, 835

Anmol Birring

Birring NDE Center, Inc.,
Joined Aug 2011
18:50 Oct-16-2015
Re: Root gap and weld quality
In Reply to Rigzang Tashi at 07:43 Oct-10-2015 (Opening).

1. You need to develop a scan plan to inspect the weld to validate its integrity. Make a drawing, show 100% coverage and then inspect.

2. Yes, you can inspect the lining from inside or outside. Please include it in your UT procedure. In your case (penstock in tunnel) simpler to inspect from inside.


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