True or False: Isolation valves should never be installed between an unfired boiler and a safety relief valve.

The statement regarding the installation of isolation valves between an unfired boiler and a safety relief valve is indeed false. Safety relief valves are critical safety components designed to prevent excessive pressure build-up within a boiler system. If isolation valves are present between the unfired boiler and the safety relief valve, they can be closed during maintenance or operational procedures, which may prevent the pressure relief valve from functioning correctly.

In normal operation, the safety relief valve must have constant access to the boiler to effectively regulate pressure. If for any reason these valves were closed, it could create a hazardous situation where the pressure continues to rise without relief, potentially leading to boiler failure or an explosion. Therefore, the guidelines and best practices in boiler safety emphasize that these valves should not be isolated unnecessarily.

This understanding directly supports the rationale that isolation valves should not be placed in a manner that could inhibit the operation of safety devices, ensuring that the safety relief valve can function as intended without obstruction.