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Technical Discussions
AJIT S. PAWAR
AJIT S. PAWAR
07:51 Feb-08-2009
Spot Radiography

Sir,
I want to know
1. What is spot radiography, acceptance criteria for it ?

2. What is ASTM A 516 material ?

3. What is the diff betn. SA 516 Gr. 70 & A 516 Gr.70 material ?

Can u please please send me answer for these?

Regards

Ajit

 
 Reply 
 
bob sudharmin
Engineering, Reliability and Integrity Eng
Shell Malaysia Trading, Malaysia, Joined Jan 2008, 54

bob sudharmin

Engineering, Reliability and Integrity Eng
Shell Malaysia Trading,
Malaysia,
Joined Jan 2008
54
16:45 Feb-08-2009
Re: Spot Radiography
In Reply to AJIT S. PAWAR at 07:51 Feb-08-2009 (Opening).

1. Spot radiography is an aid to quality control where the code does not require a weld to undergo full radiography (100%) . You can make reference to ASME VIII Div 1 UW-11. Acceptance criteria is UW-52
2. ASTM A 516 material is Carbon Steel Pressure Vessel Plates for Moderate and Lower Temperature Service.
3. There is no difference between SA516 Gr 70 and A516 Gr 70 materials. The difference is only in the Grades. ie Gr 65 is different from Gr 70

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 894

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
894
17:17 Feb-08-2009
Re: Spot Radiography
In Reply to bob sudharmin at 16:45 Feb-08-2009 .

Hi Ajit,

To add to Bob's reply, A516 is the ASTM Specification while SA516 is the ASME equivalent.

Mechanical Properties Gr 70:
Tensile: 70 to 90 ksi
Yield: 38 ksi min
Elongation: 17% min in 8” 21% min in 2”

 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
21:26 Feb-08-2009
Re: Spot Radiography
In Reply to Michel Couture at 17:17 Feb-08-2009 .

The major difference in Spot vs. 100% RT, other than the coverage, is that in evaluating the image, porosity is not considered. ASME VIII QW-52 vs. QW-51

 
 Reply 
 
Murali
Murali
05:18 May-29-2020
Re: Spot Radiography
In Reply to bob sudharmin at 16:45 Feb-08-2009 .


In spot radiography what is the minimum percentage of weld portion to be radiographed.

Any mandatory requirement for selection of Spot

 
 Reply 
 
RAVINDER Singh
NDT Inspector,
WELSPUN MIDDLE EAST PIPE KSA, India, Joined Sep 2019, 8

RAVINDER Singh

NDT Inspector,
WELSPUN MIDDLE EAST PIPE KSA,
India,
Joined Sep 2019
8
10:18 May-29-2020
Re: Spot Radiography
In Reply to Murali at 05:18 May-29-2020 .

Spot" shall have a minimum length of 6 inches. One "spot" shall be examined for each 50 ft increment of weld or fraction

 
 Reply 
 
RAVINDER Singh
NDT Inspector,
WELSPUN MIDDLE EAST PIPE KSA, India, Joined Sep 2019, 8

RAVINDER Singh

NDT Inspector,
WELSPUN MIDDLE EAST PIPE KSA,
India,
Joined Sep 2019
8
10:20 May-29-2020
Re: Spot Radiography
In Reply to Murali at 05:18 May-29-2020 .

When a "spot" ... does not comply with the miniimum quality requirements ... two additional "spots" shall be radiographically examined in the same weld increment at locations away from the original "spot

 
 Reply 
 
Murali
Murali
12:10 May-29-2020
Re: Spot Radiography
In Reply to RAVINDER Singh at 10:18 May-29-2020 .

Dear Ravinder

Thank you for your response reg Spot RT

Kindly advise as per which code or standard that every 50' length of weld 6" length RT considered as Spot RT.

 
 Reply 
 
RAVINDER Singh
NDT Inspector,
WELSPUN MIDDLE EAST PIPE KSA, India, Joined Sep 2019, 8

RAVINDER Singh

NDT Inspector,
WELSPUN MIDDLE EAST PIPE KSA,
India,
Joined Sep 2019
8
12:44 May-29-2020
Re: Spot Radiography
In Reply to Murali at 12:10 May-29-2020 .

ASME SEC. VIII DIVISION - 1
Pera - UW 52

 
 Reply 
 
Tom burke
Mistras, USA, Joined Apr 2020, 1

Tom burke

Mistras,
USA,
Joined Apr 2020
1
15:32 May-29-2020
Re: Re: Spot Radiography
In Reply to Roger Duwe at 21:26 Feb-08-2009 .

I agree with Roger that porosity is not a factor, but it should be noted, and gross, wormhole or aligned porosity should be repaired per RAGAGEP, as it may be the result of a welding procedure issue.

 
 Reply 
 

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