What is the test pressure requirement for a piping system?

The test pressure requirement for a piping system, as specified in the NFPA 58 guidelines, is set to ensure the integrity and safety of the system. The correct choice indicates that the test pressure must be 1.5 times the maximum working pressure, but it cannot be less than 3 psig. This standard is designed to effectively verify that the piping can withstand conditions beyond normal operating pressure, providing a safety buffer to account for potential anomalies or pressure surges during operation.

By requiring the test pressure to be a multiple of the maximum working pressure, the code aims to validate the system's ability to handle stresses beyond what it typically encounters. Additionally, the stipulation of a minimum of 3 psig serves as a threshold, ensuring that even lower pressure systems are tested adequately for leaks and structural integrity.

This requirement balances safety and feasibility, contributing to a robust system while imposing practical limits on the minimum test pressures applied to piping systems. Compliance with this testing requirement is crucial for reducing the risk of leaks and failures in liquefied petroleum gas installations.