Boiler inspection study guide

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Boiler inspection study guide



This Division is regularly requested by employers, companies, owners and operators of
steam boilers to advise the recommended qualifications necessary in order for an operator to
participate in an examination and obtain a boiler operator license as required by the State of
Arkansas Boiler and Pressure Vessel Law, Act 494 of 1961.
The Arkansas Boiler Safety Law, Act 494 of 1961, Section 7, provides the following:
“All boilers subject to the provisions of this Act shall either (1) be continuously monitored by
a mechanical or electronic devise approved by the Director of the Arkansas Department of
Labor, or (2) be checked at least once each hour when a plant is in operation or when any
public building is occupied, provided such boilers are equipped with approved-type
automatic appliances. Boilers that are manually operated must be under constant attendance
whenever they are in use for any purpose. Boilers fifty (50) horsepower and over, as rated by
the manufacturer, and boilers used in hospitals, hotels, schools, theatres, and office
buildings, but not limited to must be under regular attendance by a licensed operator who
holds a certificate of competency issued by the Boiler Inspection Division.
The Boiler Inspection Division shall conduct examinations for each applicant seeking a boiler
operator’s license. The examination may be either written or oral.
Each applicant shall pay a fee of twenty-five ($25.00) dollars for the examination and first
license. Each license must be renewed annually. The annual renewal fee shall be seventeen
($17.00) dollars. Before the applicant may participate in an examination, he must have had
not less than six (6) months’ on-the-job training. Proof of proper training must be furnished
to the Department prior to examination.
Any operator found operating a boiler without a certificate issued by the Boiler Inspection
Division, or operating a boiler knowing it to be defective, shall have his license revoked at
It is important that the Boiler Operator have a thorough knowledge and understanding of the
purpose of the following valves, controls and fittings, as required on steam boilers:
1. SAFETY VALVE: Prevents boiler pressure from rising above the setting of the
valve by relieving excessive steam pressure, guarding against hazards of over
2. STEAM SUPPLY STOP VALVE: The valve installed at the steam outlet of the
boiler to shut off the flow of steam.
3. STEAM PRESSURE GAUGE: Indicates the steam pressure in the boiler in pounds
per square inch.
4. STEAM GAUGE SYPHON: 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.
connection to check the accuracy of the steam pressure gauge on the boiler.
6. WATER COLUMN: The hollow casting or forging connected at the top to the boiler’s
steam space and at bottom to the water space. The water gauge glass and water test
cocks are installed on the column.
7. WATER GLASS AND GAUGE FIXTURES: To visibly show the water level in the boiler.
8. WATER TEST GAUGES OR TRY COCKS: For testing the water level in the boiler
should the water glass be out of service temporarily for any reason.
daily flushing under the water column and water level controls to keep the chamber
and lines clean, so the water will register accurately in the glass. Also provides a
means of testing the low water cutoff.
10. BLOWOFF VALVE: To provide a method of draining, flushing and blowing off the
boiler at the low point to remove the concentrated solids, sediment, seals and
sludge of keeping the boiler clean.
11. WATER FEED INLET STOP VALVE: The shutoff valve required next to the boiler on
the water feed inlet, so that the entire line can be manually shut off if it is necessary to
work on the pump or check valve. It should never be closed when the pump is to operate.
12. WATER FEED INLET CHECK VALVE: The check valve on the water feed inlet that
closes to prevent steam or water from the boiler backing up into the water feed line.
13. LOW WATER CUTOFF: The control required on all boilers to shut off the main fuel
burner when the water reaches the lowest, safe, permissible level.
14. STEAM PRESSURE OPERATING CONTROL: To maintain the desired steam
operating pressure on the boiler by regulating the burner to the steam pressure
15. HI-LIMIT PRESSURE CONTROL: 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
16. 100% FLAME SAFEGUARD: The pilot safety device to shut off the main fuel
burner valve and the pilot burner in the event of a pilot failure and to prevent the
main burner from turning on until a safe pilot is established.