[MW:13477] SSCC testing

Hi Jignesh,

 

Section 7 of this standard,specifies  testing requirements  at elevated temperature , so as simulate the worst case conditions. the The default testing temperature is 24 DegC (75 DegF).For  elevated temperature testing the H2S partial pressure should be 100Kpa (14.5psi) or more.

 

As far as testing media (i.e NACE solution A,B,C,D), duration of the test(720 hrs or less) there's is no provision for concession in the NACE standard.

Clause 7.6.4.1.3 addresses the relationship between H2S partial pressure and mole fraction. As par the following equation one may alter the mole fraction to  maintain the required partial pressure.

The severity of  SSC  testing will get altered with the change of temperature and the partial pressure of H2S. If the pressure is reduced the test gets less severe.The issue of SSC is very delicate ,thought provoking. NACE definitely have dedicated guidelines as EFC in Europe.

 

The attached article from Sandvik's website,will provide some exaplanation on this issue.

 

Thanks.

 

Pradip Goswami,P.Eng.IWE

Welding & Metallurgical Specialist & Consultant

Ontario,Canada.

Email-pgoswami@sympatico.ca,

pgoswami@quickclic.net

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Desai Jignesh (Mumbai - Piping)
Sent: Saturday, January 14, 2012 12:15 AM
To: materials-welding@googlegroups.com
Cc: pgoswami@quickclic.net; pgoswami@sympatico.ca
Subject: FW: FW: [MW:13476] RE: 13463] SSCC testing

NACE TM0177 testing at high temperature.
 
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: 14 January 2012 09:51
To: materials-welding@googlegroups.com
Subject: [MW:13475] RE: 13463] SSCC testing
 
Hello Jignesh,
 
What's the standard to be followed for SSCC testing.
 
Appreciate your reply.
 
Thanks.
 
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
pgoswami@quickclic.net
 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Desai Jignesh (Mumbai - Piping)
Sent: Thursday, January 12, 2012 10:19 PM
To: materials-welding@googlegroups.com
Subject: [MW:13463] SSCC testing
Hi,
For sulphide stress corrosion cracking of any material at high temp and 90 bar pressure if 0.005 mole % H₂S is required, is the test same if pressure is reduced to 60 bar and mole% H₂S is increased to obtain same partial pressure.   i.e, if we increase mole % H₂S and decrease total pressure, is the test condition remain same or alter?
Regds/Jignesh
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