Boiler operator study guide.
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Safety valve
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Prevents boiler pressure from rising above the setting of the valve by relieving excessive steam pressure, guarding against hazards of over pressure.
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Steam supply stop valve
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The valve installed at the steam outlet of the boiler to shut off the flow of steam.
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Steam pressure gauge
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Indicates the steam pressure in the boiler in pounds per square inch, or p s i.
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Steam gauge syphon
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The device installed between the steam gauge and the boiler to provide a water seal, so that live steam will not enter the gauge to cause a false reading or damage to the gauge.
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Inspector's test gauge connection and cock
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Provides the necessary connection to check the accuracy of the steam pressure gauge on the boiler.
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Water column
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The hollow casting or forging connected at the top, to the boiler's steam space, and at the bottom to the water space. The water gauge glass and water test cocks are installed on this.
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Water glass and gauge fixtures
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Visibly show the water level in the boiler.
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Water test gauges, or try cocks
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Are used for testing the water level in the boiler incase the water glass is for any reason unreadable.
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Drain valve under the water column and switch
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Provides a means for daily flushing under the water column and water level controls to keep the chamber and lines clean, maintaining a accurate water glass reading, as well as a means of testing the low water cutoff.
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Blowoff valve
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Provides a method of draining, flushing and, blowing off the boiler at the lowest point to remove solids, sediment, seals and sludge thus keeping the boiler clean.
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Water feed inlet stop valve
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Shut off valve required next to the boiler attached to the water feed inlet, allowing the entire line to be shut off manually so that work may be done on the pump or check valve. Must never be closed when the pump is in operation.
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Water feed inlet check valve
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Check valve on the water feed inlet that closes to prevent water or steam from the boiler backing up into the water feed line.
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Low water cutoff
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A control required on all boilers to shut off the main fuel burner when the water reaches the lowest safe permissible level.
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Steam pressure operating control
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To maintain the desired steam operating pressure on the boiler by regulating the burner to the steam pressure setting.
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Hi limit pressure control
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Is in addition to the operating control to shut off the main fuel burner supply when the pressure in the boiler exceeds the desired maximum setting.
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100% flame safeguard
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The pilot safety device used to shut off the main fuel burner valve and the pilot burner in the event of a pilot failure as well as preventing the main burner from turning on until a safe pilot is established.
