Section 355IAC3-2-12. Liquid level gauging devices; construction

   (a) Each container, except containers filled by weight, shall be equipped with a liquid level gauging device of approved design.

  (b) All gauging devices shall be arranged so that the maximum liquid level to which the container may be filled is readily determinable (See sections 3(a)(6) and 9(a) of this rule).

  (c) Gauging devices that require bleeding of the product to the atmosphere, such as the rotary tube, fixed tube, and slip tube, shall be so designed that the bleed valve maximum opening is not larger than a No. 54 drill size unless provided with an excess flow valve.

  (d) Gauging devices shall have a design pressure at least equal to the design pressure of the storage container on which they are used.

  (e) Fixed liquid level gauges shall be so designed that the maximum volume of the container filled by liquid shall not exceed eighty-five percent (85%) of its water capacity. The coupling into which the fixed liquid level gauge is threaded must be placed at the eighty-five percent (85%) level of the container. If located elsewhere, the dip tube of this gauge must be installed in such a manner that it cannot be readily removed. (This does not apply to refrigerated storage.)

  (f) Gauge glasses of the columnar type shall be restricted to bulk storage installations. They shall be equipped with:

(1) valves having metallic handwheels;

(2) excess flow valves; and

(3) extra heavy glass;

adequately protected with a metal housing applied by the gauge manufacturer. They shall be shielded against the direct rays of the sun. (State Chemist of the State of Indiana; Agricultural Ammonia PT A, Sec II, Rule 2.12; filed Dec 30, 1965, 2:15 p.m.: Rules and Regs. 1966, p. 11; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1634; 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)