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- since 1996 -

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Technical Discussions
Runii
Runii
02:03 Aug-03-2014
Gap check or gap shot rt for shocket weld

Dear all,
explain me, For what we do radiography on socket weld (Gap check)
How to find out the gap Minimum 1.5mm?
Pls attach any photo for easy understanding..

 
 Reply 
 
ANDREW BRADFORD
ANDREW BRADFORD
16:47 Aug-04-2014
Re: Gap check or gap shot rt for shocket weld
In Reply to Runii at 02:03 Aug-03-2014 (Opening).

Hi,
My understanding is that it is a check to ensure that the minimum pipe insertion has been acheived and that the gap (expansion gap) is of a minimum size.

 
 Reply 
 
Amritpal Singh
Engineering, ASNT Level III RT, UT, MT, PT, VT
JGC, Japan, Joined Jun 2013, 32

Amritpal Singh

Engineering, ASNT Level III RT, UT, MT, PT, VT
JGC,
Japan,
Joined Jun 2013
32
06:07 Aug-05-2014
Re: Gap check or gap shot rt for shocket weld
In Reply to Runii at 02:03 Aug-03-2014 (Opening).

zoom image



Pls refer schematic sketch for your easy understanding
 
 Reply 
 
walter.cabuguas
walter.cabuguas
05:08 Apr-23-2015
Re: Gap check or gap shot rt for shocket weld
In Reply to Amritpal Singh at 06:07 Aug-05-2014 .

where we can find the code of gap check?

 
 Reply 
 
RENGARAJU. B. N.
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 108

RENGARAJU. B. N.

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
108
06:48 Apr-23-2015
Re: Gap check or gap shot rt for shocket weld
In Reply to walter.cabuguas at 05:08 Apr-23-2015 .

Refer ASME B31.3-2008 section328.5.4(Welded Branch Connections), Fig. 328.5.2 (Minimum Welding Dimensions for Socket Welding Components Other Than Flanges), Fig. 328.5.4A,B,C (Typical Welded Branch Connection), Fig.328.5.4D (Acceptable Details for Branch Attachment Welds) - Page Nos. 62,63 & 64.

Regards
Rengaraju.B.N.

 
 Reply 
 
Shawn
Shawn
15:50 Apr-23-2015
Re: Gap check or gap shot rt for shocket weld
In Reply to Runii at 02:03 Aug-03-2014 (Opening).

Gap requirements are identified for fitup before welding. RT is common practice to ensure that there is enough pipe inserted into the socket and also that it is not bottomed out which could create the potential for cracking in the weld.

Common gap requirement is 1/16" minimum

 
 Reply 
 
Ajesh Kumar
Ajesh Kumar
08:17 Jul-13-2020
Re: Gap check or gap shot rt for shocket weld
In Reply to Runii at 02:03 Aug-03-2014 (Opening).

zoom image

Gap checking of socket Joint’ Radiographic Image

This is the typical Radiographic Image of gap checking of 1” socket joint
 
 Reply 
 
laurie
Australia, Joined Feb 2019, 41

laurie

Australia,
Joined Feb 2019
41
08:42 Jul-13-2020
Re: Gap check or gap shot rt for shocket weld
In Reply to Ajesh Kumar at 08:17 Jul-13-2020 .

Keep in mind that your beam will almost never be perfectly in line with gap so the sides may look touching but the gap will always be visible in the middle of the shot.

So in the radiograph shown the gap would be complying.

You would have to do two exposures 90 degrees apart to confirm the pipe was cut square but not sure how often that's done.

 
 Reply 
 
John Harville
,
USA, Joined Aug 2016, 8

John Harville

,
USA,
Joined Aug 2016
8
13:03 Jul-13-2020
Re: Gap check or gap shot rt for shocket weld
In Reply to laurie at 08:42 Jul-13-2020 .

Also keep in mind that B31.3 specifies the gap BEFORE welding.....it has no reference, nor acceptance/rejection criteria for AFTER welding. Just wanted you to be aware of this in case you get any push back when/if you start reject any socket welds.

 
 Reply 
 
Josh Spencer
Engineering,
Canada, Joined Jan 2013, 11

Josh Spencer

Engineering,
Canada,
Joined Jan 2013
11
16:02 Jul-13-2020
Re: Gap check or gap shot rt for shocket weld
In Reply to John Harville at 13:03 Jul-13-2020 .

Agreed... ASME is clear this check is BEFORE welding and do not give an accept/reject criteria unless provided in company specifications or prior agreements

 
 Reply 
 

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