How many water gauge glasses are required for boilers operating over 400 psig?

For boilers that operate over 400 psig, regulations state that at least two water gauge glasses are required. This is primarily for safety and operational reliability. The use of two gauge glasses allows operators to independently verify the water level in the boiler. By having a secondary gauge glass, operators can ensure that if one gauge were to malfunction or become inaccurate, the other would still provide an accurate reading of the water level.

This redundancy is crucial in high-pressure situations, where the consequences of incorrect water level readings can lead to significant safety hazards, including the risk of boiler failure or explosion. Therefore, the regulatory requirement is designed to enhance safety and ensure that operators maintain proper water levels at all times.

Understanding this regulatory requirement is essential for anyone working with high-pressure boilers, as it underlines the importance of safety measures in boiler operations.