32 M.R.S. §15102: Exemptions

1. Boilers. This chapter does not apply to:

A. Boilers that are under federal control;

B. Boilers used solely for propelling motor road vehicles;

C. Boilers of steam fire engines brought into the State for temporary use in times of emergency to check conflagrations;

D. Boilers used for agricultural purposes only;

E. Steam heating boilers, hot water heating boilers and hot water supply boilers , with the exception of boilers located in schoolhouses; or

F. Miniature boilers exempt pursuant to section 15103‑A.

2. Pressure vessels. This chapter does not apply to:

A. Pressure vessels that are under federal control;

B. Pressure vessels used for the transportation and storage of compressed or liquefied gases constructed in compliance with specifications of the United States Department of Transportation;

C. Pressure vessels located on vehicles operating under the rules of other state authorities and used for carrying passengers or freight;

D. Pressure vessels installed on the right-of-way of railroads and used directly in the operation of trains;

E. Pressure vessels used solely for agricultural purposes on farms;

F. Pressure vessels located in private residences and apartment houses with fewer than 6 apartments;

G. Pressure vessels having an internal or external operating pressure not exceeding 15 pounds per square inch;

H. Vessels for containing water under pressure, including those containing air, the compression of which serves only as a cushion, when neither of the following limitations is exceeded:

(1) A design pressure of 300 pressure pounds per square inch; or

(2) A design temperature of 210 degrees Fahrenheit;

I. Pressure vessels containing water heated by steam or any other direct or indirect means when none of the following limitations are exceeded:

(1) A heat input of 200,000 British thermal units per hour;

(2) A water temperature of 200 degrees Fahrenheit; or

(3) A normal water-containing capacity of 120 gallons;

J. Pressure vessels that do not exceed:

(1) Five cubic feet in volume and 250 pounds per square inch gauge pressure;

(2) One and 1/2 cubic feet in volume and 600 pounds per square inch gauge pressure; or

(3) An inside diameter of 6 inches with no limitation on pressure; or

K. Pressure vessels that are used as an integral part of a circuit breaker or transformer.