Subchapter F. LOW PRESSURE HEATING BOILERS INSTALLED PRIOR TO JULY 1, 1916
Sec.
3a.141. Riveted boilers.
3a.142. Welded boilers.
3a.143. Cast iron boilers.
3a.144. Safe pressure.
3a.145. Steam stop valves.§ 3a.141. Riveted boilers.
(a) The ASME Code governs the determination of the maximum allowable working pressure on the shell of a riveted heating boiler.
(b) The maximum allowable working pressure of a steam heating boiler may not exceed 15 psig.
(c) The maximum allowable working pressure of a hot water boiler may not exceed 160 psig at a temperature not exceeding 250°F.
Cross References This section cited in 34 Pa. Code § 3a.3 (relating to scope).
§ 3a.142. Welded boilers.
The maximum allowable working pressure on the shell of a welded steel or wrought iron heating boiler may not exceed the requirements of ASME Code, section IV.
Cross References This section cited in 34 Pa. Code § 3a.3 (relating to scope).
§ 3a.143. Cast iron boilers.
(a) The maximum allowable working pressure on the shell of a cast iron boiler may not exceed 15 psig for a steam boiler and the stamped working pressure for a hot water boiler.
(b) The maximum allowable working pressure for a boiler having a cast iron shell or heads, and steel or wrought iron tubes may not exceed 15 psig for a steam boiler and the stamped working pressure for a hot water boiler.
Cross References This section cited in 34 Pa. Code § 3a.3 (relating to scope).
§ 3a.144. Safe pressure.
An inspector may reduce the operating pressure of a heating boiler if the inspector determines that the boiler is unsafe for operation at the approved pressure and the boiler is not properly repaired. The inspector may reduce the operating pressure based upon the remaining thickness of the pressure boundaries and code of construction requirements.
Cross References This section cited in 34 Pa. Code § 3a.3 (relating to scope).
§ 3a.145. Steam stop valves.
(a) A boiler equipped with a steam stop valve must contain a check valve in the condensate return line between the boiler and the system.
(b) A heating system equipped with a steam stop valve must have a check valve in the condensate return pipe from the part of the system equipped with the steam stop valve.
Cross References This section cited in 34 Pa. Code § 3a.3 (relating to scope).
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