Two additional ASME tank fittings (devices) required for ASME tanks over 4,000 gallons water capacity that are not required by NFPA 58 for ASME tanks typically used to supply propane dispenser are a ______.

Two additional ASME tank fittings (devices) required for ASME tanks over 4,000 gallons water capacity that are not required by NFPA 58 for ASME tanks typically used to supply propane dispenser are a ______.

• A. Pressure gauge, Temperature gauge
• B. Pressure relief valve
• C. Level indicator
• D. Temperature sensor

Answer: (B)

A pressure relief device is the safety feature that prevents overpressure in large propane tanks. Propane expands when heated, so if a tank stores more gas or is exposed to high temperatures, pressure inside can rise quickly. For ASME tanks over 4,000 gallons used to supply a dispenser, ASME requires a pressure relief valve to open at a set pressure and vent gas to a safe location, protecting the vessel from catastrophic failure. This is different from gauges or indicators, which only monitor conditions, or sensors that detect conditions but don’t relieve pressure. The pressure relief valve directly mitigates the risk by releasing excess gas, making it the correct choice.

A pressure relief device is the safety feature that prevents overpressure in large propane tanks. Propane expands when heated, so if a tank stores more gas or is exposed to high temperatures, pressure inside can rise quickly. For ASME tanks over 4,000 gallons used to supply a dispenser, ASME requires a pressure relief valve to open at a set pressure and vent gas to a safe location, protecting the vessel from catastrophic failure. This is different from gauges or indicators, which only monitor conditions, or sensors that detect conditions but don’t relieve pressure. The pressure relief valve directly mitigates the risk by releasing excess gas, making it the correct choice.