1.3 Qualifications, Documented Experience & Exam Requirements

Qualifications, Documented Experience & Exam Requirements

The Pathway to Licensure

Acquiring a stationary engineer license in Maryland is not simply a matter of passing a multiple-choice test. The Board enforces a strict, progressive pathway designed to ensure that theoretical knowledge is matched with verifiable, hands-on operational experience. This "apprenticeship-style" progression guarantees that senior engineers have literally worked their way up through the ranks, mastering smaller systems before being entrusted with massive, high-pressure plants.

Foundational Requirements

Regardless of the license grade being pursued, all applicants must meet foundational educational and background requirements.

1. Educational Minimum: The Grade 5 route requires a high school diploma or GED (Public Safety Article §6.5-303). Higher grades qualify through documented experience at the grade below, or through the statutory alternatives: a mechanical engineering degree, a professional engineer license plus experience, or a U.S. Navy marine engineer's or chief petty officer's certificate.
2. Application Accuracy: Applications must be submitted under oath. Falsifying experience logs or educational credentials is a severe offense that will result in immediate denial of the application and potential barring from future licensure.

Progressive Experience Requirements

The core of Maryland's licensing system is the requirement for documented, progressive experience. An applicant cannot jump directly to a Grade 1 license; they must demonstrate competence at lower levels first. While specific regulations and alternative educational credits (like degrees in mechanical engineering) can sometimes modify these timelines, the standard progressive pathways are strictly enforced.

Entering the Field: Grade 5 and Grade 4

• Grade 5: The entry-level license requires only a high school diploma or GED (§6.5-303) and a passing score on the Grade 5 exam; no operating experience is required. The PSI bulletin adds that an applicant need not start at a lower grade if they qualify for a higher one.
• Grade 4: To qualify for the Grade 4 exam, an applicant typically must demonstrate at least six (6) months of active operating experience holding a valid Grade 5 license. Alternatively, the Board often accepts the successful completion of a recognized, 3-credit hour college-level course in stationary engineering or boiler operations in lieu of this initial 6-month experience.

Climbing the Ranks: Grades 3, 2, and 1

Advancement beyond Grade 4 requires significant, verifiable time spent "on the tools."

• Grade 3 Qualification: Requires two (2) years of documented, active experience while holding a Grade 4 or Grade 5 license, or one (1) year of that experience plus six (6) continuing-education units, or a qualifying U.S. Navy certificate (§6.5-303).
• Grade 2 Qualification: Requires thirty-six (36) months of active experience as a Grade 3 engineer under the supervision of a Grade 2 or Grade 1 engineer, or a mechanical engineering degree, or a professional engineer license plus six (6) months of experience, or a qualifying U.S. Navy certificate (§6.5-303).
• Grade 1 Qualification: The pinnacle license requires rigorous proof of senior-level experience. Applicants must demonstrate five (5) years of active experience as a Grade 2 engineer under the supervision of a Grade 1 engineer, or hold a mechanical engineering degree, or a professional engineer license plus the statutory experience, or a U.S. Navy certificate with steam-plant training (§6.5-303). Counting the earlier grades, a Grade 1 engineer typically has eight or more years of licensed operating experience.

Documenting Experience

Experience cannot merely be claimed; it must be proven. Applicants must provide signed affidavits from their current or former Chief Engineers, plant managers, or human resources departments verifying the exact dates of employment, the specific horsepower of the boilers operated, and the license grade held during that time. The Board heavily scrutinizes these documents.

Military Equivalency

Maryland strongly supports veterans entering the workforce. The Board formally recognizes military engineering experience. The statute names one route: a U.S. Navy marine engineer's certificate or chief petty officer's certificate qualifies an applicant for the Grade 3 or Grade 2 examination, and with steam-plant training for Grade 1 (§6.5-303). Other branches are not named in the statute, and every applicant still must pass the Maryland exam for the grade sought.

The State Examination

Once an application is approved and experience is verified, the applicant must pass the state examination specific to the requested grade.

• Exam Content: Exams cover a broad range of topics including thermodynamics, boiler construction, safety valves, combustion theory, water treatment, fuel systems, and Maryland law. As the grade increases, the exams become significantly more complex, focusing heavily on advanced plant management and complex troubleshooting.
• Passing Score: A minimum score of 70% is required to pass any Maryland stationary engineer exam.
• Reciprocity: §6.5-307 lets the Board waive the examination only where a reciprocity agreement with another state exists, and the Board currently has none (Board licensing FAQ), so out-of-state licensees sit the Maryland exam. §6.5-306.1 separately allows exam authorization on the basis of lawful Maryland service. An advanced degree can satisfy an experience requirement but never the exam.

License Renewal

Stationary engineer licenses in Maryland are not permanent; they operate on a strict renewal cycle.

• Renewal Cycle: Licenses must be renewed every two (2) years.
• Fees: Licensees must pay a standard renewal fee to maintain active status.
• Lapse: If a license is allowed to lapse for an extended period, the engineer may be required to completely restart the application process, including retaking the state examination. It is the sole responsibility of the engineer to ensure their license remains current.

Exam Administration Essentials

Register through PSI after reviewing the current Candidate Information Bulletin at the Board’s exam page (PSI MD Stationary Engineers). The Board states that approved reference materials listed for each grade were used to formulate exam questions and that using unapproved texts can disadvantage candidates. Passing score is at least 70%. License fees (original/renewal, effective July 1, 2025) are published on the Board fees page: Grade 1 $82; Grades 2–3 $63; Grades 4–5 $43.50; application $31.50; late renewal $126. Examination fees are paid directly to PSI and are set by the testing vendor under COMAR 09.17.03.03 — the PSI Qualification Information Bulletin (updated September 1, 2024) publishes the exam specifications: 60 questions for Grades 5 and 4 (open book, listed references only) and 80 questions for Grades 3, 2 and 1 (closed book), 120 minutes and a 70% pass mark for every grade, a $65 fee per attempt, and a per-grade content outline.