Authority: IC 22-13-2-8

Affected: IC 22-15-6

Sec. 51. (a) "Waste heat boiler" means a closed vessel that is intended to be operated under pressure for the purpose of heating water or generating steam for external use by the application of heat.

(b) The configuration of the unit shall govern the sections of this article applicable to its design, construction, fabrication, and inspection as follows:

1. (1) If the unit contains tubes, drums, and accessories commonly associated with boilers, the sections applicable to power boilers shall apply.
2. (2) If the unit contains a shell, tube bundle, and channel commonly associated with heat exchangers, the sections applicable to unfired pressure vessels shall apply.

(Fire Prevention and Building Safety Commission; 675 IAC 30-4-51; filed Jan 5, 1996, 10:15 a.m.: 19 IR 1123; 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; readopted filed Sep 4, 2019, 2:20 p.m.: 20191002-IR-675190336RFA; filed Apr 28, 2021, 11:03 a.m.: 20210526-IR-675200627FRA, eff Jul 1, 2021; readopted filed Nov 18, 2025, 10:36 a.m.: 20251210-IR-675240566RFA) NOTE: Transferred from the Boiler and Pressure Vessel Rules Board (680 IAC 2-4-51) to the Fire Prevention and Building Safety Commission (675 IAC 30-4-51) by P.L.249-2019, SECTION 15, effective July 1, 2019.