Retest of Production Test plate for vessel
Retest of Production Test plate for vessel
(OP)
Dear experts,
If in process of welding pressure vessel the Impact test of PTP get failed to pass, can we select a new plate? in this situation that the test plate has not been heat treated and fabricated along with the main product!
If in process of welding pressure vessel the Impact test of PTP get failed to pass, can we select a new plate? in this situation that the test plate has not been heat treated and fabricated along with the main product!
RE: Retest of Production Test plate for vessel
Why would you want your PTPs to not reflect the heat treatment your vessel has seen? Some codes have means of waiving the requirement for a PTP, i.e. Annex D D.7.2.2 of PD5500, but a project specification may govern and mandate PTPs.
RE: Retest of Production Test plate for vessel
Material must be from one of the heats used in the vessel.
Shall also be welded at the same time as the vessel, or as close to the start of welding as possible.
Sec.VIII only....as you don't state a construction code.
RE: Retest of Production Test plate for vessel
Since the PTP is tested after PWHT of vessel, after failing the Impact test the vessel has been fully fabricated and there is no Plate of the same heat which vessel has been made of.
RE: Retest of Production Test plate for vessel
You may be in big trouble here...
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Retest of Production Test plate for vessel
RE: Retest of Production Test plate for vessel
RE: Retest of Production Test plate for vessel
Where is inspection plan, QA system, welding engineer?
Regards
r6155
RE: Retest of Production Test plate for vessel
Please see the following clause of Sec-VIII, DIV-2, which allows re-test to be permitted. One need to read through all the appropriate clauses get the right direction.
To summarize code allows Re-Test on the same coupon plate.
3.11.7.6 Retests.
(a) Absorbed Energy Criteria – If the absorbed energy criteria are not met, retesting in accordance with the applicable
procedures of SA-370 shall be permitted.
Thanks.
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299