Prepare for the Washington DC Second Class Stationary Boilers examination with a comprehensive study package covering boiler operation, steam-plant systems, turbines, combustion, water treatment, electrical systems, controls, pumps, refrigeration, air conditioning, cooling towers, maintenance, safety, and engineering calculations. This package brings together ten technical references to support structured preparation for the broad range of subjects tested on the District of Columbia Second Class Stationary Boilers examination.
The examination is administered through PSI for the District of Columbia Board of Industrial Trades. The current test is identified as 314 Washington DC Second Class Stationary Boilers.
Second Class stationary engineering requires knowledge extending well beyond the boiler itself. The current examination includes turbines and auxiliaries, boiler operation, environmental controls, water treatment, combustion, fuels, auxiliary equipment, engineering calculations, electrical systems, pneumatic and electronic controls, pumps, feedwater and condensate systems, refrigeration, air conditioning, cooling towers, and boiler design principles.
The books in this package provide candidates with a broad technical library for developing that knowledge before test day. The package includes resources dedicated to high-pressure and low-pressure boilers, steam-plant operation, stationary engineering, refrigeration and air conditioning, electrical fundamentals, motors, and HVAC control systems.
The Washington DC Second Class Stationary Boilers examination is a closed-book test. Candidates cannot rely on these references during the examination. The books should instead be used to build knowledge, practice calculations, understand system relationships, and develop the recall needed to answer technical questions without reference materials.
The current examination is identified as 314 Washington DC Second Class Stationary Boilers.
The examination contains 80 multiple-choice questions and provides candidates with a 3-hour time limit.
The current PSI examination content outline is:
Turbines, Design Auxiliaries, and Operations is the largest individual examination category at 15%. The remaining content is distributed broadly across the major systems and responsibilities found in stationary engineering.
With 180 minutes available for 80 questions, candidates have an average of approximately 2.25 minutes per question. Because the examination is closed book, preparation should emphasize both technical understanding and the ability to recall important principles, operating procedures, and calculation methods efficiently.
The Washington DC Second Class Stationary Boilers examination is a closed-book test.
The books in this package are study materials. Candidates do not use reference books during examination 314. This makes active learning especially important. Reading should be combined with practice questions, calculations, equipment identification, system diagrams, and repeated review of weak subject areas.
A candidate should be able to recognize the purpose and operation of major plant equipment without searching a reference. This includes boilers, burners, turbines, pumps, condensers, feedwater equipment, controls, refrigeration systems, cooling towers, and boiler auxiliaries.
Closed-book preparation should also include memorizing or becoming fluent with frequently used engineering relationships and calculation methods. Candidates should know how to approach problems involving boiler horsepower, heat, efficiency, pressure, temperature, flow, electrical relationships, and other common stationary-engineering calculations.
Safety knowledge is equally important. Candidates should understand the significance of low-water conditions, combustion problems, pressure hazards, control failures, feedwater loss, pump problems, water-treatment deficiencies, and abnormal turbine or refrigeration conditions.
Steam and stationary engineers in Washington DC are regulated through the District of Columbia Board of Industrial Trades. The District recognizes multiple classes of Steam Engineer licenses, including the Class 2 credential.
The examination is only one part of the licensing process. Experience documentation and the other requirements established by the Board of Industrial Trades remain part of obtaining the Washington DC Steam Engineer credential.
Washington DC is a federal district rather than a state. Steam and stationary engineers are regulated locally through the District of Columbia Board of Industrial Trades.
District law defines a steam engineer as a person who maintains, inspects, and operates steam or hot-water boilers and related equipment. The scope can include boiler-room pumps, condensate systems, blowdown tanks, burners, fuel systems, steam and gas turbines, steam pumps, air compressors, hot-water heaters, electrical systems, chillers, refrigeration equipment, cooling towers, pumps, controls, electrical generators, and fuel-burning appliances.
This broad statutory scope helps explain why the Second Class examination covers electrical systems, refrigeration, turbines, cooling towers, pumps, controls, and engineering calculations in addition to boilers.
District law requires an applicant for a Steam Engineer license to establish the experience and knowledge required for the class of license sought to the satisfaction of the Board of Industrial Trades.
Current Stationary Engineers application instructions require an Employment Verification Letter. Applicants should maintain clear records of stationary-plant employment and duties so their experience can be documented for the licensing process.
The District's current stationary-engineer instructions also state that there is no waiver or reciprocity for stationary engineers. Candidates seeking the Washington DC credential should therefore plan to complete the applicable District licensing requirements.
Washington DC Steam Engineer licenses currently expire on September 30 of even-numbered years, regardless of when during the licensing cycle the credential was obtained.
The product title includes “Contractor Book Package,” but the PSI examination described on this page is the Second Class Stationary Boilers examination associated with the individual Steam Engineer licensing program. Business or contractor licensing obligations are separate from the individual Stationary Engineer examination and credential.
The current PSI reference list for examination 314 includes Boiler Operator’s Workbook, Stationary Engineering, High Pressure Boilers, Steam Plant Operation, Boiler Operator’s Guide, Low Pressure Boilers, Ugly’s Electrical Reference, Electric Motor Control for Integrated Systems, and HVAC Control Systems. PSI's published list names Refrigeration and Air Conditioning Technology for the refrigeration reference. The Modern Refrigeration and Air Conditioning, 22nd Edition included in this package serves as the package's HVACR study resource for refrigeration and air-conditioning concepts.
Turbines, Design Auxiliaries, and Operations represent 15% of the examination. Candidates should understand steam-turbine operating principles, governors, lubrication, condensers, auxiliary equipment, startup, shutdown, abnormal operating conditions, and the relationship between turbines and the rest of the steam plant.
Boiler Operations, Maintenance, and Safety account for 9%. Review startup and shutdown procedures, water-level control, pressure controls, safety devices, inspections, maintenance, boiler-room hazards, emergency response, and safe operating practices.
Waste to Energy Plants and Environmental/Pollution Control represent 7%. Candidates should understand basic waste-to-energy concepts, emissions, combustion byproducts, environmental-control equipment, and pollution-control principles associated with boiler and power-plant operation.
Water Treatment accounts for 8%. Study scale, corrosion, dissolved solids, hardness, oxygen, pH, blowdown, condensate return, feedwater treatment, deaeration, chemical treatment, and the consequences of poor boiler-water quality.
Boiler Combustion and Fuels represent 7%. Review fuels, burners, draft, air-fuel ratios, combustion efficiency, excess air, incomplete combustion, flue gases, and safe burner operation.
Boiler Accessories and Auxiliary Equipment account for 8%. Candidates should know the purpose and operating principles of economizers, feedwater heaters, superheaters, deaerators, draft equipment, soot blowers, pumps, condensers, tanks, and other plant auxiliaries.
Engineering Calculations represent 7%. Practice calculations involving boiler horsepower, heat, efficiency, pressure, temperature, flow, power, electrical relationships, and other stationary-engineering quantities. Because the examination is closed book, candidates should practice solving common problems without relying on worked examples.
Electrical represents 8%. Study electrical fundamentals, voltage, current, resistance, power, motors, transformers, protective devices, electrical safety, and common equipment found in mechanical plants.
Controls—Pneumatic and Electronic account for 7%. Review control loops, sensors, actuators, relays, motor controls, pneumatic systems, electronic controllers, sequence-of-operation concepts, and troubleshooting.
Pumps, Feed, Hydronic, and Condensate Systems represent 8%. Candidates should understand centrifugal-pump principles, suction and discharge conditions, cavitation, feedwater systems, hydronic circulation, condensate return, valves, piping arrangements, and troubleshooting.
Refrigeration, Air Conditioning, and Cooling Towers account for 8%. Review refrigeration cycles, compressors, condensers, evaporators, refrigerants, chillers, cooling towers, heat rejection, airflow, water flow, and the fundamentals of commercial HVAC systems.
Boiler Design and Principles represent 8%. Study firetube and watertube boilers, pressure parts, heating surfaces, circulation, steam generation, combustion chambers, fittings, safety devices, and construction principles affecting boiler operation.
A strong closed-book study method is to break preparation into systems. Review boiler construction and combustion together, then water treatment and feedwater, turbines and auxiliaries, pumps and condensate, electrical and control systems, refrigeration and cooling towers, and engineering calculations.
Practice explaining each system without consulting the book. If a candidate can describe what the equipment does, how it interacts with the plant, what can go wrong, and what safety concerns apply, that knowledge is more likely to remain available during a closed-book exam.
Scenario-based study is also useful. Review what happens during low water, flame failure, loss of feedwater, high boiler-water solids, pump cavitation, control-system failure, condenser problems, refrigeration-system faults, or abnormal turbine conditions. Understanding cause and effect can help with questions that test application rather than simple memorization.
1 Exam Prep supports Washington DC Second Class Stationary Boilers candidates through organized study guidance, boiler and stationary-engineering review, practice-oriented preparation, engineering calculations, technical-system study, and confidence-building preparation structure.
The books in this package cover the major technical areas represented on the examination, including high-pressure and low-pressure boilers, steam plants, turbines, combustion, water treatment, pumps, electrical systems, motor controls, refrigeration, air conditioning, and HVAC controls.
Because examination 314 is closed book, an organized study plan is especially important. Candidates need to move beyond simply locating answers in references and build enough understanding to recognize correct principles and procedures from memory.
Practice-oriented preparation can help candidates strengthen calculations, equipment knowledge, operating sequences, safety awareness, and troubleshooting skills. Reviewing missed questions and returning to weak topics can help create a more complete understanding of stationary-plant operations.
1 Exam Prep focuses on helping candidates organize the broad examination content, study trade-specific systems, reinforce technical fundamentals, and develop a consistent preparation routine without guaranteeing a particular examination score, license approval, or testing outcome.
The current examination contains 80 multiple-choice questions.
Candidates receive a 3-hour time limit.
No. Examination 314 is a closed-book test. The books in this package are used for preparation rather than during the examination.
Turbines, Design Auxiliaries, and Operations is the largest individual category at 15%.
Yes. Engineering Calculations represent 7% of the current examination outline.
Yes. Electrical knowledge represents 8%, while pneumatic and electronic controls represent another 7% of the examination.
Yes. Refrigeration, Air Conditioning, and Cooling Towers represent 8% of the current exam.
Yes. Turbines, their auxiliary systems, design concepts, and operation form the largest individual examination category.
Yes. District law requires applicants to establish the experience and knowledge appropriate to the class of Steam Engineer license sought, as determined by the Board of Industrial Trades.
Current District Stationary Engineers application instructions require an Employment Verification Letter.
Current District instructions state that there is no waiver or reciprocity for stationary engineers.
Stationary and Steam Engineer licensing is regulated through the District of Columbia Board of Industrial Trades.
The Washington DC examination is administered through PSI.
Current District instructions state that licenses expire on September 30 of even-numbered years.
The current PSI bulletin requires a three-month waiting period before retaking a failed Second Class Stationary Boilers examination.
Focus on turbines, boiler operation and safety, environmental controls, water treatment, combustion, fuels, boiler auxiliaries, engineering calculations, electrical systems, pneumatic and electronic controls, pumps, feedwater and condensate systems, refrigeration, air conditioning, cooling towers, and boiler design principles.
This package provides a broad technical study library for the subjects represented on the Washington DC Second Class Stationary Boilers examination. Its combination of boiler, steam-plant, stationary-engineering, electrical, motor-control, refrigeration, and HVAC-control resources supports structured preparation for a demanding closed-book examination covering multiple plant systems and engineering disciplines.
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