Thursday, April 1, 2010

[MW:4661] ER70S-3 for low temperature application

Hi members,
 
Please provide a suggestion for the following query.
 
I have qualified a PQR for GTAW+SMAW with ER70S-3 & E7018-1. The PQR is impact tested at - 46 deg C at root(GTAW) and filling (SMAW) and passed (Min. 50J energy obtained).
 
As per ASME Sec.II part C, E7018-1 will support up to - 46 Deg C, but ER70S-3 will support up to - 20 Deg.C only.
 
Since I have proven the toughness through PQR, can I use this PQR for job with impact test requirement of - 46 Deg C, even ER70S-3 does not support for this temperature as per Sec.IIC?.
 
Thanks & Regards
Muhammed Ibrahim PK

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1 comment:

Ashfaq Anwer said...

We have used ER70S-3 for welding piping with design temperature -35 deg C containing liquid ammonia.

And you have qualified PQR also, there would not be any issue.

Regards,
Ashfaq Anwer
http://forums.thepetrostreet.com

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