34 Pa. Code § 3a.162 – Portable boilers.

(a) A portable boiler must meet the requirements of § 3a.21 (relating to stamping).
(b) A portable boiler may be mounted in covered trailers if the following conditions are met:
1. (1) A 30-inch clearance is provided on both ends of the boiler.
2. (2) The boiler’s trailer is provided with chocks and is anchored to prevent movement during operation.
3. (3) The boiler is anchored to the trailer.
4. (4) The trailer provides a means or area to remove boiler tubes.
5. (5) The roof or the ceiling of the trailer provides space to allow proper operation of all valves and appurtenances.
(c) The clearance on one side of a boiler mounted in a covered trailer may be reduced to 3 inches if the trailer has access panels for removal of handhole plugs for inspection and maintenance.
(d) The user or operator shall notify the Department in writing and obtain written Department approval before a portable boiler is moved and placed in service.
(e) Inspection of portable boilers shall be performed in accordance with § 3a.111(1)—(7) (relating to field inspections).