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State of Washington Classified Job Specification


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Class Code: 391F
Category: Protective Services


Inspects in-service and repairs of boilers and unfired pressure vessels in assigned area to ensure compliance with State laws and regulations.

Typical Work

Performs annual internal and external inspections of power boilers, and biennial inspections of unfired pressure vessels to ensure compliance with State rules, regulations and ASME Code; issues inspection certificates;

Checks boilers for safety valve operation, proper welding, corrosion, erosion, pitting, or cracking of heads and interiors of steam drums, securing of swash plates, splitting or cracking of tube ends, and blistering, cracking, erosion, and leakage of combustion space; performs hydrostatic tests and checks entire boiler for leakage;

Notifies chief inspector when boilers or pressure vessels fail to meet legal requirements; prepares report of defects; prepares reports and correspondence on boiler inspections and boiler laws;

Inspects plate replacement or installation of new boilers for proper clearances, ladders and runways, exits from boiler room, blow-off tanks, and pressure reducing valves;

Performs other work as required.

Knowledge and Abilities

Knowledge of:  State laws and regulations and American Society of Mechanical Engineers Code on boilers and unfired pressure vessels; safety factors involved in installation and operation of high pressure boilers and unfired pressure vessels, high pressure and exhaust piping, and other powerhouse equipment; steam engineering; boiler making; steam fitting and fluid transmitting systems; stress and strength potentials of metals used in fabrication of boilers and pressure vessels; welding. 

Ability to:  inspect and recognize causes of malfunctioning in high and low pressure systems; develop and maintain satisfactory working relationships with the public; prepare clear, concise progress and inspection reports.

Legal Requirement(s)

There may be instances where individual positions must have additional licenses or certification. It is the employer’s responsibility to ensure the appropriate licenses/certifications are obtained for each position.

Persons legally authorized to work in the U.S. under federal law, including Deferred Action for Childhood Arrivals recipients, are eligible for employment unless prohibited by other state or federal law.

Desirable Qualifications

Five years of experience in the construction, maintenance, repair, or operation of high pressure boilers (high pressure is 15 pounds per square inch of steam pressure) and unfired pressure vessels as a mechanical engineer, steam engineer, boilermaker, or boiler inspector. 


A Certificate of Competency issued as a result of successful completion of the National Board requirements for Boiler and Pressure Vessel Inspectors.

NOTE:  A Commission from the National Board of Boiler and Pressure Vessel Inspectors must be acquired upon employment and maintained as a condition of employment.

Class Specification History

New class: 5-1-63
Revised minimum qualifications: 7-14-72
Title change (formerly Boiler Inspector Deputy), general revision: 2-26-76
Revised minimum qualifications: 1-14-83
Revised minimum qualifications: 11-14-86
Revised minimum qualifications: 1-13-89
Revised minimum qualifications: 10-13-89
Revised definition and minimum qualifications: 9-10-93
Revised minimum qualifications: 5-14-99
New class code: (formerly 43300) effective July 1, 2007

Revised Legal Requirements; effective June 6, 2024, due to adopted legislative action.