Rupture members, when used in parallel with a relief valve, are not to exceed what percentage above designed working pressure?

When using rupture members in conjunction with a relief valve, the accepted industry standard stipulates that these rupture members should not exceed a certain percentage above the designed working pressure, which is essential for ensuring safety and system integrity. The correct guideline indicates that rupture members must not exceed 20% over the designed working pressure. This stipulation exists because rupture members are designed to act as a fail-safe in scenarios where the pressure exceeds normal operating parameters, and exceeding the specified percentage could increase the risk of failure, potentially leading to hazardous situations. By adhering to the 20% limit, the integrity of the system is preserved, ensuring that both the rupture member and the relief valve function effectively to protect the system as intended.