[MW:14344] ASTM A516Gr.70 Plate is not accepted for LPG Bullet fabrication as well as Low Temperature service equipment & Piping.

Dear All,
At the time of LPG Bullet of fabrication unavailability of ASTM A516 Gr.60 at Indian Market our contractor used at the position of Bullet nozzle self reinforcement plate thickness of 75mm  ASTM A516Gr.70 in place of ASTM A516Gr.60.
According to OISD standard 144(Second Edn., 2005), for LPG installations clause 6.2.1 point(ii):- Material shall be in line with design code. ASTM A516 Gr.60 shall be used for refinery service and for marketing installation where H2S is not present ASTM A516 Gr.70 or A537 CLASS 1 can be used. Micro-alloyed stell containing NI.Mo,Va shall not be considered. Maximum specified tensile stress shall not be more than 80,000psi.
As per MTC Manganese ./.age is 1.37, however as per code it should be 0.85 - 1.20.
So pleased clarified me why ASTM A516 Gr.70 material is not accepted as per metallurgy as well as service point of view.
And also Advised me what based we can accepted of ASTM A516 Gr.70 material in placed of ASTM A516 Gr.60 as per metallurgy as well as service point of view, if any testing is required for acceptance the said material.
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Thanks & Regards
Pinaki Boxi.

Mob-+919178466059

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