Boiler mountings for safe and proper operation Which of the following are standard boiler mountings fitted to ensure correct indication, pressure control, and safety?

Introduction / Context:
Boiler mountings are the essential fittings provided on a boiler to ensure safe operation, measurement, and control. Examinations often test whether learners can distinguish “mountings” (mandatory safety/operational devices) from “accessories” (performance enhancers such as superheaters or economizers).

Given Data / Assumptions:

• A working boiler producing saturated or superheated steam.
• Need for level monitoring, pressure indication, and overpressure protection.
• Standard codes require particular devices to be present and functional.

Concept / Approach:
Typical mountings include: water level indicators (to show safe level and avoid overheating), pressure gauges (to display operating pressure), safety valves (to relieve excess pressure), steam stop valve, feed check valve, blow-off cock, and fusible plug (on certain boilers). The items listed—water level indicator, pressure gauge, safety valve—are all canonical mountings.

Step-by-Step Solution:
Identify category: are these devices mountings or accessories?Water level indicator: mandatory for safe level control.Pressure gauge: mandatory to monitor internal pressure.Safety valve: mandatory to prevent overpressure.Therefore, selecting “all of these” is correct.

Verification / Alternative check:
Regulatory boiler codes and standard textbooks list these under “mountings,” separate from accessories like economizers and superheaters.

Why Other Options Are Wrong:
Choosing any single device omits other equally mandatory fittings; “none” is incorrect because these are universally required.

Common Pitfalls:
Confusing mountings with accessories; overlooking that multiple indicators/valves are often required in parallel for redundancy.

Final Answer:
all of these