This is not acceptable that pipe is hydro tested at a pressure less than design pressure. It should be further tested for 1.5 times of design pressure
Regards,
On Sunday, November 8, 2026, 4:05 PM, Babur Khan <mbabur.bwp@gmail.com> wrote:
--Expert Opinion Required - Hydrotest Pressure for ASTM A358 TP316/316L Pipe
Dear experts,
We require your expert opinion on the following:
Our contractor has procured ASTM A358 TP316/316L Stainless Steel Welded Pipe, 36" Schedule 20 (0.50" / 12.7mm).
The piping system design pressure is 550 psi. During MTC review, we noted that this pipe was tested at the manufacturing facility at 450 psi.
As per ASME B31.3, the test pressure will be 1.5 times the design pressure:550 x 1.5 = 825 psi, which is greater than the manufacturer's test pressure of 450 psi.
Query:1. Can we test this pipe at 825 psi?2. Is any confirmation / approval required from the manufacturer before proceeding with this test pressure?
Your guidance would be highly appreciated.
Muhammad Babur KhanProject Quality SupervisorCSWIP 3.2.2API 510API 570
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