What requirement must shut off valves meet regarding design working pressure?

Prepare for the Texas CNG Category 3 Test. Review with flashcards and multiple choice questions, each with detailed hints and explanations. Get ready to pass your exam!

Shut off valves are critical components in systems utilizing compressed natural gas, and their design must meet specific requirements to ensure safety and reliability. The correct requirement is that shut off valves must be not less than the rated working pressure of the entire system. This specification ensures that the valves can withstand the maximum pressure that the system is expected to encounter during normal operations, thereby preventing failures that could lead to leaks or system malfunctions.

If the design working pressure of a valve were to be lower than the rated working pressure of the system, it could result in catastrophic failure at the point of the valve. By ensuring that the valve's rating is equal to or exceeds this minimum requirement, the integrity of the system is maintained, and safety is prioritized.

Options that suggest the valve must exceed rated working pressure or that it should have a rating equal to maximum working pressure can create confusion if not clearly contextualized, as they might imply unnecessary overengineering or misinterpretation of operational limits. Similarly, suggesting that valves must be adjustable to varying pressures does not align with the fundamental requirement of having a static, reliable maximum pressure rating for operational safety.

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