What is the maximum allowable pressure for a pressure reducing valve and check valve installed after a shore water connection?

The maximum allowable pressure for a pressure-reducing valve and check valve installed after a shore water connection is determined by standards aimed at ensuring safety and preventing damage to onboard systems. The correct answer highlights that the nominal working pressure should not exceed 80 PSI.

This specification is important because water pressure higher than 80 PSI can potentially cause issues such as leaks, damaged hoses, and failure of onboard plumbing fixtures. The use of pressure-reducing valves helps ensure that the system operates within safe limits, providing stable and manageable water pressure to the vessel's plumbing system.

Adhering to the 80 PSI guideline aligns with the best practices outlined in the American Boat and Yacht Council (ABYC) standards, which promote safe vessel operations by mitigating risks associated with high-pressure water systems. Therefore, the condition stated in the correct answer effectively safeguards against potential damage and ensures compliance with established marine safety standards.