What should always accompany an engaged glass in high pressure boilers to determine water level?

In high pressure boilers, try cocks are crucial for confirming the water level indicated by the gauge glass. These are small connections to the boiler that allow the operator to visually inspect the water level by draining a small amount of water from the boiler system. This not only provides a direct indication of the water level within the boiler but also serves as a safety check against any potential inaccuracies in the gauge glass itself.

Using try cocks enhances safety by allowing operators to verify the indication of the water level gauge, which is critical in maintaining appropriate water levels to avoid dangerous situations such as overheating or boiler failure. This practice is essential in ensuring system reliability and operator safety.