Which gauge is specified by NFPA 58 to indicate the maximum liquid level on ASME tanks?

Which gauge is specified by NFPA 58 to indicate the maximum liquid level on ASME tanks?

• A. Float Gauge
• B. Fixed maximum liquid level gauge
• C. Temperature gauge
• D. Pressure gauge

Answer: (B)

NFPA 58 requires a device that clearly shows the maximum allowable liquid fill for ASME LPG tanks. The fixed maximum liquid level gauge is designed for this purpose because it marks and stays at the limit that should not be exceeded, giving the operator a clear stop point during filling. It isn’t driven by the current level or conditions—it simply indicates the maximum level. A float gauge, by contrast, shows how much liquid is currently in the tank, which is useful for monitoring but doesn’t communicate the safe maximum fill. Temperature and pressure gauges measure temperature and pressure, not the fill limit, so they don’t serve the purpose of indicating the maximum liquid level.

NFPA 58 requires a device that clearly shows the maximum allowable liquid fill for ASME LPG tanks. The fixed maximum liquid level gauge is designed for this purpose because it marks and stays at the limit that should not be exceeded, giving the operator a clear stop point during filling. It isn’t driven by the current level or conditions—it simply indicates the maximum level. A float gauge, by contrast, shows how much liquid is currently in the tank, which is useful for monitoring but doesn’t communicate the safe maximum fill. Temperature and pressure gauges measure temperature and pressure, not the fill limit, so they don’t serve the purpose of indicating the maximum liquid level.