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- since 1996 -
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Technical Discussions
Deepu Varghese
Deepu Varghese
11:27 Apr-27-2012
RT and UT for pressure vessel

Hi All,
Thanks for reply for earlier post.
We have a Pressure vessel with U stamp and Code symbol RT1.The name plate for the vessel states the Radiography FULL (see section UG-116 and UW-11 IN ASME Sec VII which gives some exception for category B weld )
But one of the weld joint is category B (see fig UW-3) which has done only MT. Can any one please conform it is as per ASME Sec VIII.
Also another weld which is of Category D is tested with UT and MT. Can anyone please conform that it is as per ASME Sec VIII also if correct what section in the standard.
weld joint is for drain on the vessel 2" class 150 schedule 160. SA350 LF2 and SA 333 Gr 6
The reason I am asking is that the vessel was in service and during shutdown they found some defect on the drain (flange attachment weld ) and since the vessel Name plate says Full radiography they want to look at the radiographic film but could not find as the joint is tested as mentioned above.
Any advice will be appreciated.Thanks in advance.
Deepu Varghese

 
 Reply 
 
Oliviero
NDT Inspector,
Quality Control srl, Italy, Joined Oct 2008, 414

Oliviero

NDT Inspector,
Quality Control srl,
Italy,
Joined Oct 2008
414
22:22 Apr-27-2012
Re: RT and UT for pressure vessel
In Reply to Deepu Varghese at 11:27 Apr-27-2012 (Opening).

Hi,
The joint you are stating in category B can be included into the exception of UW-11? This can be determined knowing base material type and nominal thickness.
ASME VIII div. 1 does not require Category D RT examination when the category D are not butt-welds.
You can consult the designer or to the Authorized Inspector.

 
 Reply 
 
Deepu Varghese
Deepu Varghese
15:09 Apr-28-2012
Re: RT and UT for pressure vessel
In Reply to Oliviero at 22:22 Apr-27-2012 .

Thanks Oliviero.
The base metal is for category B weld is SA 333 GR 6 Material wall thk is 8.74 S160

and for category D weld shell base metal is SA516 gr 70 and its thickness is 22mm.

Is there a reference in the code for RT not required for non butt weld for category D weld.
Thanks

 
 Reply 
 
Oliviero
NDT Inspector,
Quality Control srl, Italy, Joined Oct 2008, 414

Oliviero

NDT Inspector,
Quality Control srl,
Italy,
Joined Oct 2008
414
22:46 Apr-28-2012
Re: RT and UT for pressure vessel
In Reply to Deepu Varghese at 15:09 Apr-28-2012 .

Full radiography is defined in UW-11(a), where are defined the welds to be examined radiographically for their full lenght. All of them are butt-welds.
There are some exemptions at point (2), (4) and (5).
This means that a weld different from butt-weld needs not to be examined radiographically.
At the same time category B butt-weld could be exempted as per point (2) as much as per material and nominal thickness and the relevant part in Subsection C of this code section (UCS-56 for the material you declared).
But how there are category B weld joint when you are using a seamless pipe fo the vessel shell?
It is a circumferential weld between pipe and reducer fitting?

 
 Reply 
 
Deepu Varghese
Deepu Varghese
14:54 Apr-29-2012
Re: RT and UT for pressure vessel
In Reply to Oliviero at 22:46 Apr-28-2012 .

Hi Oliviero,
The vessel shell is SA516 grade 70 with thickness 22mm
The B weld is between pipe nozzle (2" Sch 160 SA333 Gr6) and WN Flange.
The D weld is with shell and pipe nozzle which is a fillet weld.
Thanks Oliviero.Good Explanation.Thanks.
Deepu Varghese

 
 Reply 
 
Deepu Varghese
Other, Plant Inspector
SABIC, Saudi Arabia, Joined Jul 2011, 13

Deepu Varghese

Other, Plant Inspector
SABIC,
Saudi Arabia,
Joined Jul 2011
13
19:16 May-07-2012
Re: RT and UT for pressure vessel
In Reply to Deepu Varghese at 14:54 Apr-29-2012 .

Dear Deepu Varghese,

Its pure coincides to meet someone with same name and functional area.So would you mind telling me more about you.

Regards

 
 Reply 
 
deepu
deepu
07:33 May-08-2012
Re: RT and UT for pressure vessel
In Reply to Deepu Varghese at 19:16 May-07-2012 .

Hi I am from kerala.Please email me in deepuvarghese@yahoo.com.

Good to hear from you.Thanks.

 
 Reply 
 
Alpesh
Alpesh
10:28 Sep-01-2014
Re: RT and UT for pressure vessel
In Reply to deepu at 07:33 May-08-2012 .

ASTM SA 333 GR 6 this grade is available in alloy steel material..if u need any type of fittings in alloy steel material please check http://www.simplexfittings.com

 
 Reply 
 
Shaneeb
Shaneeb
04:06 Dec-19-2014
Re: RT and UT for pressure vessel
In Reply to Alpesh at 10:28 Sep-01-2014 .

Nor nozzles , rt is not required and this will fulfill under rt 1.
No issues

 
 Reply 
 
shaneeb
shaneeb
11:24 Aug-04-2015
Re: RT and UT for pressure vessel
In Reply to Deepu Varghese at 14:54 Apr-29-2012 .

D weld is with shell and pipe nozzle which is a fillet weld, as you mentined is wrong. Because there will weld pentration across the shell so how can you say that it is fillet weld.

Please revert if you have any clarification.

 
 Reply 
 
jamin patel
NDT Inspector, NDT LeveL-III @ UIC, KSA
Saudi Arabia, Joined Dec 2012, 100

jamin patel

NDT Inspector, NDT LeveL-III @ UIC, KSA
Saudi Arabia,
Joined Dec 2012
100
15:51 Aug-04-2015
Re: RT and UT for pressure vessel
In Reply to Deepu Varghese at 11:27 Apr-27-2012 (Opening).

zoom image
this wil clear your dobut.
 
 Reply 
 
Shaneeb
Shaneeb
21:35 Aug-04-2015
Re: RT and UT for pressure vessel
In Reply to jamin patel at 15:51 Aug-04-2015 .

Yes , you are right

 
 Reply 
 

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