What percent of the operating pressure must the hydrostatic test pressure be set at for checking rerolled tube seats for leakage?

The hydrostatic test pressure for checking rerolled tube seats for leakage is established at 100% of the operating pressure. This standard is set to ensure that the test accurately reflects the conditions to which the system will be subjected during regular operation. By testing at the full operating pressure, any potential weaknesses or leaks in the tube seats are more likely to be identified, thereby enhancing the reliability and safety of the system when it resumes normal operations.

Testing at 100% allows for a thorough examination while avoiding unnecessary over-pressurization, which could lead to false failure indications or damage during testing. This approach aligns with best practices in pressure testing, ensuring that the integrity of the equipment is maintained without introducing risks associated with higher-than-normal pressures.