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

Affected: IC 15-16-1-10; IC 15-16-1-11

Sec. 5. (a) All shutoff valves and appurtenances (liquid or vapor) shall be suitable for use with anhydrous ammonia and designed for not less than the maximum pressure to which they may be subjected. Valves that may be subjected to container pressures shall have a rated working pressure of at least two hundred fifty (250) psig, except valves for refrigerated storage tanks shall have a rated working pressure at least equal to the maximum pressure to which they may be subjected and meet the following requirements:

1. (1) At a minimum, all manually operated shutoff valves, which are either located on tank openings or are the last valves in any ammonia line that are capable of discharge into the open air, shall be color coded to designate the correct product state, either liquid or vapor, that the valves communicate with in the pressure vessel.
2. (2) Highway orange shall be used to designate that the valve communicates with the liquid space of the tank at maximum permissible filling density.
3. (3) Highway yellow shall be used to designate that the valve communicates with the vapor space of the tank at maximum permissible filling density.
4. (4) All piping and all appurtenances, except safety devices, relief valves, gauges, and those shutoff valves that are color coded, shall be painted white.
5. (5) Only nonfluorescent, fade-resistant colors shall be used.
6. (6) On systems covered in section 4 of this rule and this section, the manually operated shutoff valves referenced in subdivision (1) shall also be labeled "LIQUID" or "VAPOR" in lettering not less than one (1) inch in height.

(b) All connections to containers, except pressure relief connections and gauging devices, shall have shutoff valves located as close to the container as practicable.

(c) Liquid level gauging devices that are so constructed that outward flow of container contents shall not exceed that passed by a No. 54 drill size opening need not be equipped with excess flow valves.

(d) Openings from containers or through fittings attached directly on a container, to which pressure gauge connection is made, need not be equipped with excess flow valves if such openings are protected by not larger than a No. 54 drill size opening.

(e) All excess flow valves shall be plainly and permanently marked with the following:

1. (1) Name or trademark of the manufacturer.
2. (2) The catalog number.
3. (3) The rated capacity.

(f) Excess flow valves shall be designed to close automatically at the rated flows of vapor or liquid as specified by the manufacturer. The connections and line, including valves or fittings being protected by an excess flow valve, shall have a greater capacity than the rated flow of the excess flow valve so that the valve will likely close in case of failure at any point in the line or fittings.

(g) Excess flow and back pressure check valves shall be located inside of the container or at a point outside where the line enters the container. In the latter case, installation shall be made in such a manner that any undue strain, beyond the excess flow or back pressure check valve, will not cause breakage between the container and the valve.

(h) Excess flow valves shall be designed with a bypass, not to exceed a No. 60 drill size opening, to allow equalization of pressure.

(State Chemist of the State of Indiana; Agricultural Ammonia PT A, Sec II, Rule 2.5; filed Dec 30, 1965, 2:15 p.m.: Rules and Regs. 1966, p. 5; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1628; 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)