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khanvassel (Mechanical) (OP)
28 Mar 10 23:53
Hi,

I am working on a PV having MDMT -58 degree F in wet sour enviroment, is SA-516-70 N suitable for this application? What is the minimun temp limit for SA-516-70N and where to find?

Regards
rneill (Mechanical)
29 Mar 10 0:15
You will require impact testing of the material and weld procedures to establish it is suitable for that MDMT.  In regards to sour service, you will want to review NACE MR0175/ISO 15156 and NACE Report 8X194 for general sour service and HIC specific issues.

It sounds like you don't have much experience with this material and wet sour environments so I would recommend you obtain the assistance of someone who is knowledgeable and can assist with developing your vessel requirements.
bhushan76 (Mechanical)
29 Mar 10 5:27
Requirement of Impact test for any material is function of thickness of material & MDMT. Hence there is no such "Minimum temp limit" for any material , as regards to impact testing.

Additionally there clauses for reduction in MDMT mentioned in UCS-66 and UCS-68(c) of ASME Sec Viii Div 1.
As pointed rightly by rneil you can take assistance of experienced vessel design engineer for the job.
 
stefa363 (Mechanical)
29 Mar 10 6:00
Generally SA-516 Gr. 70 N has no problem above -45 °C if the requirements of ASME Code are satisfied (like bhushan76 say). In any case, with -50 °C, you must have an impact test at (minimum( -50 °C) and you have to choose the value required (Joule) by the code (or by PED Dyrective if you have to use it).

In any case consider also what say rneill for sour service requirements.

Consider that when you must have an impact test there are also many requirements that you have to consider: production coupon, PQR, WPS with these material, etc.

I hope these information could help you.
stanweld (Materials)
29 Mar 10 10:30
You should be able to obtain SA-516-70 N that will meet impact absorbed energy requirements at -58F and you should have no problem qualifying impact test weld procedures at that temp.

weldtek (Materials)
29 Mar 10 11:06
Agree with Stanweld, however, thickness, and PWHT if applicable will affect a materials suitability.  I advise that you get all the requirements summarized and talk to a material supplier or better yet the mill because generally there's more than one option.
Arcelor Mittal, formerly Bethlem Lukens, has knowledgeable staff.
rneill (Mechanical)
29 Mar 10 14:34
In Western Canada we regularly use SA516-70N for sour service vessels but you do need to be careful with the detailed specs (chemistry limits, qualification testing, source of supply) and this material may not be suitable in all cases (e.g., heavy wall vessels). Some people do restrict vessel material to SA516-60N as this material is less likely to cause sour service problems.
SJones (Petroleum)
29 Mar 10 19:59
Absolutely.  Getting a TM0284/EFC 16 HIC test pass and -50 deg C Charpy toughness together is not something a lot of plate mills can manage.

Steve Jones
Materials & Corrosion Engineer
http://www.oilandgaspeople.com/cv/11499664
http://www.linkedin.com/pub/8/83b/b04
 

ak1965 (Mechanical)
30 Mar 10 10:39
Please refer Table 1A on page 18 of ASME section II 2007.

you will get the values.   
khanvassel (Mechanical) (OP)
2 Apr 10 8:11
Thank you all for your expert advice, It is recommend in one of our clients spec that if MDMT is below -47 C, clad the vessel with UNS S31254 or use SA 203 Gr D or E with impact and HIC test.

Temp range in ASME II Table A1 is upto -20 F only.


Regards



 
brimstoner (Materials)
17 Apr 10 11:56
Try these guys:
http://www.edmontonexchanger.com/steelplate_services.html
Sounds as if you might be in their neighbourhood.   
brimstoner (Materials)
18 Apr 10 22:00
You are about at the practical limit for SA-516-70N, and also -60N for that matter.

It can be done, but you will need to shop for MTRs, not just for PQR purposes but for the production steel, because production tests blocks will be subsequently required.  Lower carbon, fine grain size, and Charpy numbers comfortably above the minimum are desirable.  

Getting results in the weld is not difficult, it is usually the HAZ that presents the greatest difficulty.   

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