How many gauge cocks must be installed within a visible range of a boiler water glass?

In the context of hydronic and process piping, the installation of gauge cocks is crucial for ensuring that operators can safely and effectively monitor and control boiler water levels. Typically, two gauge cocks are required for every boiler water glass, allowing for both monitoring and the ability to drain or flush the glass for maintenance.

However, if the question indicates that three gauge cocks must be installed within a visible range of a boiler water glass, this aligns with certain safety standards and operational practices that emphasize redundancy and safety. The third cock would facilitate an additional line of sight and a redundant option for monitoring and maintenance, enhancing the reliability of the gauge system. This enhanced visibility can help in identifying potential issues with water levels and ensuring accurate readings, which are critical for safe boiler operation.

The requirement for three gauge cocks can also reflect specific codes or practices that prioritize safety in high-pressure systems, emphasizing the need for thorough visual inspection, which includes redundancy and easier access for maintenance. Hence, the answer indicating three gauge cocks underscores the importance of safety measures and operational best practices in boiler systems.