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What You Should Know About Your Boiler’s Water Level Gage Glass

Water gage glasses continue to be a vital instrument on power boilers that are constructed to comply with the requirements of the American Society of Mechanical Engineers’ (ASME’s) Boiler and Pressure Vessel Code. The code requires that all boilers must be equipped with at least one water gage glass for good reason in addition to the other level-indicating instruments operators rely upon from remote control areas.

 

The gage glass provides a ready determination of the water level for the operator, especially at critical times, including start-up, shutdown, and during testing of low water fuel cutout devices. A gage glass may also serve as a referee in the event two remote level indicators begin to disagree with each other. Causes for a dispute with the displayed level between multiple remote indication systems may include sludge buildup in sensing lines, restricted valves, or a component failure on one of the instruments.

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