Article inapplicable to certain boilers.

Sec. 915. This article does not apply to any of the following: (a) Boilers under federal control. (b) Boilers used in the power plants of self-propelled vehicles designed primarily for the transportation of individuals or property on a highway, except vehicles used exclusively on stationary rails or tracks. (c) Boilers used solely for agricultural purposes. (d) Steam or vapor boilers that carry a pressure of not more than 15 p.s.i.g. and are located in a private residence or in an apartment building with a capacity of fewer than 6 families. (e) Hot water boilers operated at a pressure that does not exceed 160 p.s.i.g. or a temperature that does not exceed 250 degrees Fahrenheit and are located in a private residence or in an apartment building with a capacity of fewer than 6 families. (f) Miniature steam or marine engines used as a hobby. (g) Boilers used on farms for mint processing purposes. (h) Subject to section 919, miniature hobby locomotives that operate on narrow gauge tracks that are less than 24 inches in width.