True or False: Miters are permitted in systems with a design pressure greater than 50 psi.

The correct understanding is that miters are generally not permitted in systems with a design pressure greater than 50 psi due to the potential for increased stress concentration at the joint. In high-pressure systems, the integrity of the piping is critical, and mitered joints can create weak points that may lead to leaks or failures under pressure.

Piping standards and codes often recommend the use of appropriate fittings, such as elbows, to ensure a smoother flow path and to reduce the likelihood of turbulence and stress at the joints. This is especially important in high-pressure applications where safety and reliability are paramount.

While special approvals or particular system types might allow for exceptions, the overarching guideline is to avoid miters in high-pressure scenarios to maintain system integrity.