Pennsylvania Code & Bulletin
COMMONWEALTH OF PENNSYLVANIA

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The Pennsylvania Code website reflects the Pennsylvania Code changes effective through 52 Pa.B. 4384 (July 30, 2022).

Pennsylvania Code



Subchapter H. SPECIAL INSTALLATIONS


Sec.


3a.161.    Modular boilers.
3a.162.    Portable boilers.
3a.163.    Fired coil water heaters and instantaneous water heaters.
3a.164.    Storage water heaters.
3a.165.    Steam/hot water coil storage water heater.
3a.166.    Miniature boilers and kitchen equipment.
3a.167.    Hot water/steam heat exchangers.
3a.168.    Autoclaves and quick opening vessels.
3a.169.    Fuel trains and piping systems.
3a.170.    Swimming pool heaters.
3a.171.    Locomotive boilers.

§ 3a.161. Modular boilers.

 (a)  A modular boiler as defined in ASME Code, section IV shall be installed in accordance with §  3a.36 (relating to clearances). The distance between modules may be reduced to the manufacturer’s recommendations if the entire modular boiler system meets the 30-inch clearance requirements.

 (b)  A modular boiler must have only one inlet and one outlet valve, as required by ASME Code, section IV. The boiler controls must comply with ASME Code, section IV and ASME/CSD1.

 (c)  Inspection of modular boilers shall be performed in accordance with §  3a.111(1)—(7) (relating to field inspections).

§ 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)  A 30-inch clearance is provided on both ends of the boiler.

   (2)  The boiler’s trailer is provided with chocks and is anchored to prevent movement during operation.

   (3)  The boiler is anchored to the trailer.

   (4)  The trailer provides a means or area to remove boiler tubes.

   (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).

§ 3a.163. Fired coil water heaters and instantaneous water heaters.

 (a)  A fired coil water heater and instantaneous water heater shall be installed in accordance with ASME Code, section IV, articles HLW 700, HLW 800 and HG 614.

 (b)  A storage vessel may be used with a fired coil water heater and instantaneous water heater, if its controls comply with ASME CSD1, and it meets the ASME Code over-pressure protection requirements. The vessel must be ASME Code constructed if the Btu input exceeds 200,000 Btu.

 (c)  Temperature controls must be designed to not exceed 210°F.

 (d)  Inspection of fired coil water heaters and instantaneous water heaters shall be performed in accordance with §  3a.111(4) (relating to field inspections).

§ 3a.164. Storage water heaters.

 (a)  A storage water heater shall be installed in accordance with ASME Code, section IV, articles HLW 700 and HLW 800, and comply with safety valve requirements of ASME CSD1.

 (b)  Temperature controls must be designed to not exceed 210°F.

 (c)  Inspection of storage water heaters shall be performed in accordance with §  3a.111(4) (relating to field inspections).

§ 3a.165. Steam/hot water coil storage water heater.

 (a)  The design and construction of a steam/ hot water coil storage water heater must comply with ASME Code, section VIII and the additional control requirements of ASME/CSD1.

 (b)  Temperature controls must be designed to not exceed 210°F.

 (c)  Inspection of steam/hot water coil storage water heaters shall be performed in accordance with §  3a.111(8) (relating to field inspections).

§ 3a.166. Miniature boilers and kitchen equipment.

 (a)  A miniature boiler must be manufactured under the ASME ‘‘S,’’ ‘‘H’’ or ‘‘M’’ Code. A boiler manufactured under ASME ‘‘S’’ and ‘‘H’’ Code must be stamped with a National Board registration number.

 (b)  Clearance requirements contained in §  3a.36 (relating to clearances) do not govern a miniature boiler or kitchen equipment if all pressure containing parts with appurtenances are visible for inspection.

 (c)  Miniature boiler controls must comply with ASME/CSD1.

 (d)  The sight glass and pressure gauge of a miniature boiler installed in a cabinet must always be visible during operation.

 (e)  Discharge from safety valves must be piped to a safe point.

 (f)  Burners for gas-fired installations must be AGA approved.

 (g)  Inspection of miniature boilers and kitchen equipment shall be performed in accordance with §  3a.111(1)—(6) (relating to field inspections).

§ 3a.167. Hot water/steam heat exchangers.

 (a)  Heat exchangers must be manufactured under the ASME Code.

 (b)  Heat exchangers must have adequate over-pressure protection to protect both systems.

 (c)  Heat exchangers used for domestic hot water supply must have a high temperature limit switch designed not to exceed 210°F.

 (d)  Inspection of hot water/steam heat exchangers shall be performed in accordance with §  3a.111(8) (relating to field inspections).

Cross References

   This section cited in 34 Pa. Code §  3a.3 (relating to scope).

§ 3a.168. Autoclaves and quick opening vessels.

 (a)  An inspector shall inspect autoclaves and quick opening vessels with close examination of all moving parts, locking devices, pins and interlocking devices, in accordance with ANSI/NB 23.

 (b)  An autoclave and quick opening vessel must have interlocking systems to prevent charging the vessel until all openings and locking devices are fully in place.

 (c)  A pressure-relieving device must be sized in accordance with the data plate for pressure. The capacity must be based on the pressure and pipe size or the total Btu valve of the boiler.

 (d)  Inspection of autoclaves and quick opening vessels shall be performed in accordance with §  3a.111(8) (relating to field inspections).

§ 3a.169. Fuel trains and piping systems.

 (a)  The piping of low-pressure steam systems, except PVC materials, must comply with Chapters 10 and 12 of the IMC.

 (b)  The piping of low-pressure hydronic piping systems, except PVC materials, must comply with Chapter 12 of the IMC.

 (c)  The design and installation of high-pressure steam and high temperature hot water piping must comply with ASME B31.1.

 (d)  The repair of high pressure/temperature piping systems installed before 1998 must comply with the code of construction.

 (e)  The installation of fuel trains and associated piping must comply with ASME/CSD1.

 (f)  Inspection of fuel trains and piping systems shall be determined by the type of boiler to which the system is attached and performed in accordance with §  3a.111 (relating to field inspections).

§ 3a.170. Swimming pool heaters.

 (a)  A swimming pool heater is an instantaneous water heater. The heater must meet the construction requirements of ASME Code, section IV and the control requirements of ASME/CSD1 except if exempt under §  3a.3(d) (relating to scope).

 (b)  A pool heater may be piped with polyvinyl chloride material rated for the pressure and temperature of the heater after the isolation valves.

 (c)  Inspection of swimming pool heaters shall be performed in accordance with §  3a.111(4) (relating to field inspections).

§ 3a.171. Locomotive boilers.

 (a)  New installations for boilers of locomotives must comply with ASME Code, section I.

 (b)  Inspection of locomotive boilers shall be performed in accordance with §  3a.111(1) and (2) (relating to field inspections).



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