What is the requirement for all pipe fittings in CNG systems?

Answer: B — Forged steel stamped 5,000 psi or greater

In CNG systems, the requirement for all pipe fittings is that they must be forged steel stamped 5,000 psi or greater. This specification ensures that the fittings can handle the high-pressure environment typical of compressed natural gas applications, thus maintaining safety and reliability in the system. Forged steel fittings are preferred in these systems due to their strength and ability to withstand high pressures without risk of failure. The minimum pressure rating of 5,000 psi is established to ensure that the fittings can support the operational pressures encountered in CNG systems, which can often exceed that threshold during normal operation. Using fittings with a lower rating could pose serious safety risks, including leaks or catastrophic failures, due to the inability of those fittings to endure the pressure exerted by the compressed natural gas. Therefore, adherence to the specified rating is critical for safe and effective operation of CNG systems.