What is the minimum wall thickness required for discharge piping from pressure relieving devices to atmosphere?

The minimum wall thickness for discharge piping from pressure relieving devices to atmosphere is defined by the standards set for ensuring the safety and integrity of high-pressure systems. Schedule 40 has been established as the minimum requirement because it provides a suitable balance of strength and durability for the expected pressures and potential thermal expansion experienced in this context.

Schedule 40 piping is capable of handling the necessary stress and provides adequate resistance to the fluctuating pressures that might occur during relief operations. This standard is important in preventing failures, leaks, or other hazardous consequences that could arise from inadequate piping.

Other schedules, while they may offer greater thickness and strength, are not considered the baseline requirement for this specific application, indicating that while they are usable, they do not represent the minimum acceptable criteria set forth for ensuring operational safety and integrity in pressure discharge scenarios.