Welder Red Seal · Question
A company is required to perform Post Weld Heat Treatment (PWHT) on a pressure vessel fabricated from P1 Group 1 material, 30 mm thick, according to ASME B31.1. The code specifies a minimum holding temperature of 595 °C and a minimum holding time of 1 hour per 25 mm of thickness. What is the minimum required holding time for this vessel?
The requirement is 1 hour per 25 mm of thickness. For a 30 mm thick vessel, the calculation is (30 mm / 25 mm/hour) * 1 hour = 1.2 hours. This ensures the mater
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Question: A company is required to perform Post Weld Heat Treatment (PWHT) on a pressure vessel fabricated from P1 Group 1 material, 30 mm thick, according to ASME B31.1. The code specifies a minimum holding temperature of 595 °C and a minimum holding time of 1 hour per 25 mm of thickness. What is the minimum required holding time for this vessel?
Answer options:
- 1.0 hour ✅ 1.2 hours
- 1.5 hours
- 2.0 hours
Correct answer: 1.2 hours
Explanation: The requirement is 1 hour per 25 mm of thickness. For a 30 mm thick vessel, the calculation is (30 mm / 25 mm/hour) * 1 hour = 1.2 hours. This ensures the material receives adequate soaking at the elevated temperature to relieve residual stresses and improve microstructure.
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