15 Questions
What should be visually checked to ensure complete combustion in a boiler?
Flame
What should be monitored to ensure the hot water system circulating pump is operating within the expected range?
Pump discharge pressure, suction pressure, and differential pressure
Which color flame indicates complete combustion in a typical natural gas flame?
Blue
What should never be present on the tips of a light fuel oil (number 2 light oil) flame?
Black
What should circulating pumps have adequate flow of to their seals for cooling, sealing, and lubrication?
Clean water
What should be done to prevent high pressure in a hot water boiler?
Maintain the normal boiler operating pressure at 25% or 69 kPa (10 psi) less than the safety relief valve setting
What should be monitored to determine when hot water boiler surfaces require cleaning?
Stack temperature
Why should the maximum operating temperature of hot water boiler water not exceed 120°C?
To avoid accelerating corrosion and meet the heating needs of the system
What is a critical step in steam boiler operation related to water level maintenance?
Ensuring that water level is maintained within range in the boiler
What should be visually checked in a boiler flame?
Black tips or smokiness of the flame
What is the purpose of the pressure differential required for safety valves?
To prevent the boiler pressure from exceeding the maximum allowable working pressure
How should the high-pressure cut-off be set for power boilers?
No greater than the lowest safety valve set point minus safety valve blowdown
What should be observed once the boiler has been fired?
The steam pressure reaches the desired set point and does not increase further
What does rising stack temperatures at a given firing rate indicate?
Heat transfer surfaces are becoming dirty
When should the stack temperature be monitored and recorded?
Once the boiler has completely warmed up and is at normal operating pressure
Test your knowledge on the inspection of boiler operating parameters and checking of hot water system circulating pumps for proper operation and maintenance.
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