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How long may a high pressure boiler plant of over 200 bhp be left unattended?

  1. 15 minutes if within 500 ft of boiler room

  2. 30 minutes if within 500 ft of boiler room

  3. 1 hour if the operator is nearby

  4. CANNOT approach near continuous absence

The correct answer is: 30 minutes if within 500 ft of boiler room

A high pressure boiler plant of over 200 bhp can be left unattended for 30 minutes if the operator is within 500 feet of the boiler room. This guideline is in place to ensure safety and proper monitoring of boiler operations. Leaving a high pressure boiler unattended for longer than this could pose a safety risk, as it may not allow sufficient time for the operator to respond to any potential issues, such as pressure fluctuations, system failures, or leaks. The choice specifying 30 minutes is informed by regulations that emphasize the need for operators to be readily available to manage the boiler's operational status, thereby preventing any hazardous situations that might arise during unmonitored functioning. This time limitation balances operational flexibility with safety protocols that are paramount in the management of high-pressure systems. Other options suggest shorter or longer durations, which may not comply with the standards for ensuring adequate supervision and safety of such equipment, particularly given the risks associated with high-pressure boiler operations.