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Washington DC
(335) Sixth Class Stationary Boilers

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District of Columbia
Board of Industrial Trades

1100 4th St SW
Washington, DC  20024
Phone:  (202) 442-4400
Licensing Link

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PSI Services LLC
DCOPLA Program

3210 E. Tropicana
Las Vegas, NV 89121
Phone:  (800) 733-9267
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Exam Type


Exam Content

Subject Areas% of
Boiler Operation and Safety10
Fuel and Draft System10
Steam Systems10
Boiler Water Treatment10
Engineering Calculations10
Boiler Fittings / Accessories10
Hydronic Systems10
Feedwater Systems10
Boiler Design and Principles10
Total number of test questions:
Time allowed (hours):

Books Allowed in the Exam

Low Pressure Boilers, 4th Edition, Frederick M. Steingress
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Any edition of the above book is acceptable

Study materials are currently NOT available for this exam

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