• A class 1B installer's license qualifies a person to install a low-pressure boiler that does not exceed a firing rate of 1,000,000 BTU per hour as certified by the boiler manufacturer. For a class 1B license, the sum of all modules in a modular boiler shall not exceed a firing rate of 1,000,000 BTU per hour as certified by the boiler manufacturer.
  
  
• A class 2B installer's license qualifies a person to do all of the following:
  
  (a) Install a low-pressure boiler of any capacity or firing rate.
  
  (b) To perform work covered by a class 1B license.
  
  
  
• A class 3B installer's license qualifies a person to do all of the following:
  
  (a) Install a power boiler that has a capacity of not more than 5,000 pounds of steam per hour.
  
  (b) Install or replace non-boiler external piping as defined by ASME code B31.1 and R 408.4032.
  
  (c) Perform work covered by a class 2B license.
  
  
• A class 4B installer's license qualifies a person to do all of the following:
  
  (a) Install a boiler that has a capacity of not more than 300,000 pounds of steam per hour.
  
  (b) Install or replace non-boiler external piping as defined by ASME code B31.1 and R 408.4032.
  
  (c) Perform work covered by a class 3B license.



• A class 5B installer's license qualifies a person to do all of the following:
  
  (a) Install a boiler of any capacity or firing rate. Exception: a nuclear heat source boiler.
  
  (b) Install or replace non-boiler external piping as defined by ASME code B31.1 and R 408.4032.
  
  (c) Perform work covered by a class 4B license.



• A class 6B installer's license qualifies a person to install a boiler that utilizes a nuclear heat source or its parts, appurtenances, or system components. Before a license is issued, an applicant for a class 6B license shall submit evidence of both of the following:
  
  (a) Familiarity with and knowledge of all federal rules and regulations regarding the installation of a boiler that has a nuclear heat source.
  
  (b) Employment by a company in possession of a valid ASME nuclear code symbol applicable to the portions of any nuclear boiler system that the company proposes to install.



• A class P license qualifies a person to install or replace non-boiler external piping or repair non-boiler external piping as defined by ASME code B31.1 and R 408.4032.

• A class I license allows a licensee to repair a boiler by means other than welding, riveting, or other fabrication process.



• A class II license allows a licensee to do both of the following:
  
  (a) Repair a low-pressure boiler, a hot water supply boiler, and a fire tube boiler of any pressure.
  
  (b) Perform work covered by a class I license.



• A class III license allows a licensee to do all of the following:
  
  (a) Repair a high-pressure boiler.
  
  (b) Repair or replace non-boiler external piping, as defined by ASME code B31.1 and R 408.4032.
  
  (c) Perform work covered by a class II license.



• A class IV license allows a licensee to do all of the following:
  
  (a) Repair or field-erect a boiler of any pressure. Exception: a boiler that has a nuclear heat source.
  
  (b) Repair or replace non-boiler external piping as defined by ASME code B31.1 and R 408.4032.



• A class V license allows a licensee to erect and repair a boiler that has a nuclear heat source or its parts, appurtenances, or system components, and also provides the following:
  
  (a) The licensee may repair or replace non-boiler external piping, as defined by ASME code B31.1 and R 408.4032.
  
  (b) Before a license is issued, an applicant for a class V license shall submit evidence of the following:
  
  (i) Familiarity with and knowledge of all federal rules and regulations regarding the construction of a boiler that has a nuclear heat source.
  
  (ii) Employment by a company in possession of a valid ASME N-type symbol stamp applicable to the portions of any nuclear boiler system he or she proposes to repair.



• A class P license qualifies a person to install or repair non-boiler external piping as defined by ASME code B31.1 and R 408.4032.

Examination Schedules