NFPA 58 requires a ________ or other device providing pressure-relieving protection shall be installed in each section of piping and hose in which lp-gas can be isolated between shutoff valves.

NFPA 58 requires a ________ or other device providing pressure-relieving protection shall be installed in each section of piping and hose in which lp-gas can be isolated between shutoff valves.

• A. Check valve
• B. Pressure relief valve
• C. Hydrostatic Relief Valve
• D. Safety valve

Answer: (C)

The section of piping and hose that can be cut off from the system between shutoff valves must have a device that relieves pressure if that closed segment were to experience a pressure rise. The device chosen for this purpose is a hydrostatic relief valve. It’s specifically designed to vent if liquid LP-gas in a sealed portion of piping expands (for example, from temperature rise), preventing the pressure from climbing high enough to damage or burst the piping. Think of it as a safety release woven into the piping layout: when LP-gas is isolated, the hydrostatic relief valve provides a controlled path to vent gas rather than letting pressure build unchecked. Other devices like a check valve stop backward flow, a general pressure relief valve is typically used on tanks or regulators, and a safety valve is a broader term that doesn’t fit this piping-specific, hydrostatic-relief requirement. That’s why the hydrostatic relief valve is the best answer here.

The section of piping and hose that can be cut off from the system between shutoff valves must have a device that relieves pressure if that closed segment were to experience a pressure rise. The device chosen for this purpose is a hydrostatic relief valve. It’s specifically designed to vent if liquid LP-gas in a sealed portion of piping expands (for example, from temperature rise), preventing the pressure from climbing high enough to damage or burst the piping.

Think of it as a safety release woven into the piping layout: when LP-gas is isolated, the hydrostatic relief valve provides a controlled path to vent gas rather than letting pressure build unchecked. Other devices like a check valve stop backward flow, a general pressure relief valve is typically used on tanks or regulators, and a safety valve is a broader term that doesn’t fit this piping-specific, hydrostatic-relief requirement. That’s why the hydrostatic relief valve is the best answer here.