Answer :
Final answer:
The valves between a boiler and water column should be locked or sealed open. This is an important safety measure, designed to prevent accidental blockage. The specific nature of these valves can vary depending on the boiler system's design and conditions.
Explanation:
The valves located between the boiler and the water column should be locked or sealed open. This is a crucial safety provision as it ensures that the passage between the boiler and the water column isn't accidentally blocked. Valves found in this location are usually part of a system's safety apparatus, helping to regulate the pressure and water flow in a boiler system. These valves aren't often regular globe valves, rather designed to tolerate the high pressure created by the boiler.
Boilers, particularly in an industrial setting, can generate high pressures. Such high pressures can potentially be hazardous, hence the need for controlled valves that can withstand such conditions while preventing accidental opening. Consequently, the options 'steel and rated at 300 PSI' and 'protected against accidental opening’ might also apply in certain circumstances, depending on the specific boiler system's design and operating conditions.
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