Authority: IC 15-16-1-6; IC 15-16-1-7

Affected: IC 15-16-1

Sec. 2. (a) Containers used with systems covered in 355 IAC 3-4, 355 IAC 3-5, 355 IAC 3-6, and 355 IAC 3-7 shall be constructed and tested in accordance with the 1965 edition (and subsequent amendments thereto) of the Unfired Pressure Vessel Code of the ASME except that construction under Table UW 12 at a basic joint efficiency of under eighty percent (80%) is prohibited and compliance with paragraphs UG 125 through UG 128, UG 132, and UG 133 shall not be required.

(b) All containers, except refrigerated storage tanks with a design pressure of less than fifteen (15) psig, shall be:

1. (1) inspected by a person having a current certificate of competency from the National Board;
2. (2) stamped (letter and figure sizes as required by the Code) by a manufacturer, holding a valid certificate of authorization to use the unfired pressure vessel manufacturer's symbol from the American Society of Mechanical Engineers; and
3. (3) registered with the National Board.

(c) Containers exceeding thirty-six (36) inches in diameter or two hundred fifty (250) gallons capacity shall be constructed to comply with one (1) or more of the following additional requirements:

1. (1) Containers shall be stress relieved after fabrication in accordance with the Code.
2. (2) Cold formed heads, when used shall be stress relieved.
3. (3) Hot formed heads shall be used.

(d) Noncode welding, where necessary, shall be made only on saddles or brackets originally welded to the containers by the manufacturer. Noncode welding directly to the container or any part subject to pressure is prohibited.

(e) The provisions of subsection (a) shall not be construed as prohibiting the continued use or reinstallation of containers constructed and maintained in accordance with the 1949, 1950, 1952, 1956, 1959, and 1962 editions of the Unfired Pressure Vessel Code of the ASME.

(State Chemist of the State of Indiana; Agricultural Ammonia PT A, Sec II, Rule 2.2; filed Dec 30, 1965, 2:15 p.m.: Rules and Regs. 1966, p. 4; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1627; readopted filed Jun 20, 2001, 3:22 p.m.: 24 IR 3822; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 25, 2013, 3:27 p.m.: 20131225-IR-355130482RFA; readopted filed Jul 2, 2019, 10:42 a.m.: 20190731-IR-355190258RFA; readopted filed Nov 4, 2025, 2:37 p.m.: 20251119-IR-355240619RFA)