Section 680IAC2-10-8. Steam gages for low pressure steam heating boilers; connections; dial range; stops

   (a) Each low pressure steam heating boiler shall have a steam gage connected to its steam space or to its water column, or its steam connections by means of a siphon or equivalent device to keep the gage tube filled with water and so arranged that the gage cannot be shut off from the boiler except by a cock with a tee or lever handle, placed in the pipe near the gage. The handle of the cock shall be parallel to the pipe in which it is located when the cock is open.

  (b) The scale on the dial of a low pressure steam heating boiler gage shall be graduated to not less than thirty (30) psig. The gage shall be provided with effective stops for the indicating pointer at the zero (0) point and at the maximum pressure point. The travel of the pointer from zero (0) to thirty (30) psig pressure shall be at least three (3) inches.

  (c) Connections to steam-gage siphons shall be of non-ferrous metal when smaller than one (1) inch pipe size and longer than five (5) feet between siphon and the point of connection of pipe and boiler, and also when smaller than one-half (½) inch pipe size and shorter than five (5) feet between the siphon and point of connection of pipe to the boiler.

  (d) On a compound gage, effective stops shall be set at the limits of the gage readings on both pressure and vacuum sides. (Boiler and Pressure Vessel Rules Board; 680 IAC 2-10-8; filed Jan 5, 1996, 10:15 a.m.: 19 IR 1134; readopted filed Jul 9, 2001, 1:33 p.m.: 24 IR 3822; readopted filed Sep 21, 2007, 9:16 a.m.: 20071010-IR-680070389RFA; readopted filed Oct 19, 2007, 1:08 p.m.: 20071114-IR-680070389RFA; readopted filed Sep 5, 2013, 10:09 a.m.: 20131009-IR-680130182RFA)