Boiler mounting: purpose of a water level indicator State whether the statement is correct: A water level indicator is a device that shows the exact water level inside a boiler at any instant for safe operation and control.

Introduction / Context:
Boiler mountings are essential devices necessary for safe and reliable operation. Among them, the water level indicator (gauge glass assembly) provides the operator with a direct visual indication of the liquid level to prevent overheating of heating surfaces and to maintain proper steam quality.

Given Data / Assumptions:

• Direct-reading gauge glass or reflex/transparent type indicator.
• Boiler operating within design pressure and temperature.
• Proper isolation and blow-through cocks installed for maintenance and testing.

Concept / Approach:
Maintaining correct water level is critical. Too low a level risks exposing furnace crowns or tubes, leading to overheating and failure; too high a level risks water carryover and priming. The indicator provides continuous level information; multiple indicators may be used for redundancy and verification.

Step-by-Step Solution:
Steam space connects to the top cock; water space to the bottom cock of the gauge glass.The interface in the glass tracks the internal level due to hydrostatic communication.Operators routinely blow through the cocks to ensure the passages are clear and the reading is true.Thus, the device indicates the water level at any instant.

Verification / Alternative check:
Operating procedures require gauge-glass checks and compare with alarmed probes on modern units; both corroborate the function stated.

Why Other Options Are Wrong:
Pressure gauges measure pressure, not level; restrictions to “low pressure” or “twin glass only” are unnecessary, as level indicators are employed across pressures and in single or multiple arrangements.

Common Pitfalls:
Trusting a fouled or blocked gauge; not performing routine blow-through tests; misreading reflex versus transparent glass images.

Final Answer:
True