Boiler and Pressure Vessel Inspectors. 
The State Board of Boiler Rules adopts safety rules on boilers and unfired pressure vessels, and the Department of Labor and Industries (L&I) administers those regulations by performing safety inspections and issuing operating permits.  State law requires a permit before installing, reinstalling, or moving any boiler or unfired pressure vessel.

L&I must employ a chief inspector and deputy inspectors for purposes of conducting inspections, issuing permits, and enforcing the state laws and rules on boilers and unfired pressure vessels.  A deputy inspector must have, at the time of appointment, at least five years of practical experience in construction, maintenance, repair, or operation of high pressure boilers and unfired pressure vessels as a mechanical engineer, steam engineer, boilermaker, or boiler inspector.  Deputy inspectors must also pass the state boiler examination.  The chief inspector also commissions special inspectors who are employed to inspect boilers or unfired pressure vessels by insurance companies and companies that operate boilers and unfired pressure vessels.

National Board of Boiler and Pressure Vessel Inspectors. 
The National Board of Boiler and Pressure Vessel Inspectors (NBBI) consists of the chief boiler inspectors in most states, provinces in Canada, and major cities in the United States.  The NBBI commissions boiler and pressure equipment inspectors, provides online and classroom training to inspectors, and publishes the National Board Inspection Code.  To be an NBBI-commissioned inspector, a candidate must:

• have a high school education;
• be employed as an inspector by a jurisdictional authority, an owner-user inspection organization, a nonmember enforcement agency, a federal inspection agency, or the national board;
• pass the national board examination; and
• have a minimum of five credit points through education and experience.  

Education credits are assigned for technical training or curricula associated with boilers and pressure vessels and for associate's or bachelor's degrees in engineering, technology, science, and mathematics.  Experience credits are assigned for each year's experience associated with boilers and pressure vessels. 

The qualifications for a deputy boiler and pressure vessel inspector are modified by removing the requirement to have at least five years of specified practical experience.  Instead, a deputy boiler inspector must meet, at the time of appointment, the qualification requirements for a commission set forth by the NBBI.