ASTM G48 Tests
ASTM G48 Tests
(OP)
The duplex stainless vessels are to be operated at temperature well above 60 deg C on an offshore platform.
As part of inspection and testing requirements during fabrication process, is testing to ASTM G48 necessary (due sensitization and emrittlement during welding process)?
What should the test temperature be held at? And what is the industry's acceptance criterion?
Thanks.
As part of inspection and testing requirements during fabrication process, is testing to ASTM G48 necessary (due sensitization and emrittlement during welding process)?
What should the test temperature be held at? And what is the industry's acceptance criterion?
Thanks.





RE: ASTM G48 Tests
ht
http://www.welding-advisers.com/
RE: ASTM G48 Tests
Frankly, corrosion testing using ASTM A 923 Test Method B to verify a proper solution anneal of the duplex material used in vessel fabrication is most cost effective, and more important. If you specify Method B, this can be used as part of the qualification of the weld procedures and would provide more meaningful results.
RE: ASTM G48 Tests
- Offshore environment (tropical)
- DSS vessel design temperature at 100 deg C
- Vessel content hydrocarbon fluid
Will it be valid if I specify the test temperature to be 100+15=115 deg C and the concentration (corrosivity) of the FeCl3 solution to be similar to the seawater? Isn't the objective to ensure that the DSS has been supplied properly solution annealed and it is able to withstand the corrosive external environment?
RE: ASTM G48 Tests
RE: ASTM G48 Tests
A) ASTM G48 for the base metal and A923-B and C for the weld coupons
B) Better still A923-C for the base materials and weld coupons + A923-B for the weld coupons (at the lowest design temp)?
RE: ASTM G48 Tests
RE: ASTM G48 Tests
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/