Dear Kiran,
It seems to me that referring to NACE-H2S sour service (MR-0175 / MR-0103) for low-temperature welding with materials SA-333 Gr.6 and SA-350 LF2, for LPG service is not relevant for the reason that the LPG stored has already been stripped of H2S-type impurities in the amine plant.
On the other hand, Kiran seems to me that you have a confusion: for low-temperature service the main variable that is measured is the toughness, that is, the ability of a material to absorb energy in the event of sudden shock and is evaluated by the transition ductile - brittle of the material in a Charpy impact test (ref. UG-84 ASME Section VIII- Div. 1). Therefore, it is not the hardness.
Reviewing API 582 “Welding Guidelines for the Chemical, Oil, and Gas Industries” there are no references to hardness as a parameter that measures the toughness of a weld at low temperature.
Talk to the customer, certain that the WPS / PQR presented is correct and that only weld toughness needs to be evaluated.
Regards,
Ramon Briceno – Metallurgical Engineer / Oil & Gas
www.linkedin.com/in/ramon-briceño-976265b5
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