Section 680IAC2-9-2. Feed supply and piping

   (a) Every miniature boiler shall be provided with at least one (1) feed pump or another mechanical feeding device except where the following conditions exist:

(1) Where the boiler is connected to a water main or system having sufficient pressure at all times to feed the boiler at a pressure six percent (6%) in excess of the safety valve setting.

(2) Where the boiler is operated without extraction of steam (closed system in which case the boiler is filled, when cold, through the connection or opening provided as required in subsection (b)).

  (b) Each miniature boiler shall be fitted with a feed water connection which shall not be less than one-half (½) inch iron pipe size. The feed piping shall be provided with a check valve near the boiler and a valve or cock between the check valve and the boiler.

  (c) Feed water may be introduced through the blow-off connection where the boiler is operated without extraction of steam (closed system).

  (d) Feed water shall not be introduced through the water column or gage glass connections while the boiler is under pressure. (Boiler and Pressure Vessel Rules Board; 680 IAC 2-9-2; filed Jan 5, 1996, 10:15 a.m.: 19 IR 1132; 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)