What is included in regulations regarding the working pressure of shutoff valves?

The regulation regarding the working pressure of shutoff valves stipulates that they should be able to withstand a hydrostatic test of 1.5 times the rated service pressure. This requirement is crucial for ensuring that valves can handle unexpected pressure surges without failing, thereby enhancing safety in systems that utilize compressed natural gas. By being tested at this elevated pressure, the integrity and reliability of the valve are verified, ensuring that it can effectively control and contain the gas under operational conditions.

The other options do not align with standard safety practices. For instance, having the lowest pressure rating in the system would not ensure safety or functionality. Limiting pressure ratings to valves made after the year 2000 overlooks many existing valves that may still be operational under stringent safety guidelines. Lastly, the assertion that shutoff valves do not require pressure testing is fundamentally flawed; testing is essential to ensure that all components in the gas delivery system function safely and efficiently under pressure.