In a steam boiler, which gauge is not required.

In a steam boiler, which gauge is not required.

• A. Temperature gauge
• B. Pressure gauge
• C. Water level gauge
• D. Safety valve

Answer: (A)

In operating a steam boiler, the essential measurements and protections focus on pressure, water level, and safe relief of excess pressure. The pressure gauge is needed because the boiler’s safe operation depends on keeping the steam pressure within design limits. The water level gauge is crucial to ensure there’s enough water to prevent dry firing and overheating of the boiler tubes. The safety valve is a required safety device that relieves pressure if it rises too high. A temperature gauge isn’t required because, for a saturated-steam boiler, the steam temperature is determined by the pressure (the steam table links pressure to saturation temperature). Monitoring pressure directly provides the critical information needed for safe operation and control, and the temperature isn’t a separate safety parameter in the same way. Therefore, the temperature gauge is the one not required.

In operating a steam boiler, the essential measurements and protections focus on pressure, water level, and safe relief of excess pressure. The pressure gauge is needed because the boiler’s safe operation depends on keeping the steam pressure within design limits. The water level gauge is crucial to ensure there’s enough water to prevent dry firing and overheating of the boiler tubes. The safety valve is a required safety device that relieves pressure if it rises too high.

A temperature gauge isn’t required because, for a saturated-steam boiler, the steam temperature is determined by the pressure (the steam table links pressure to saturation temperature). Monitoring pressure directly provides the critical information needed for safe operation and control, and the temperature isn’t a separate safety parameter in the same way. Therefore, the temperature gauge is the one not required.