Section 355IAC3-5-2. Design pressures; container construction standards

   (a) Containers shall be designed and constructed in accordance with the ASME Code, have a minimum design pressure of two hundred sixty-five (265) psig, and meet other applicable requirements of DOT regulations. Containers designed and constructed in accordance with earlier ASME Code editions having a minimum design pressure of two hundred fifty (250) psig and meeting certain limiting conditions prescribed by DOT regulations, are authorized for use.

  (b) The shell or head thickness of any container shall not be less than three-sixteenths (³/₁₆) of an inch.

  (c) Baffles are not required for cargo tanks designed for service in which, under normal conditions, the container is loaded to capacity and discharged at one (1) unloading point. All other containers over five hundred (500) gallons capacity should be equipped with suitable baffle plates.

  (d) All container openings, except pressure relief valves, liquid level gauging devices, and pressure gauges, shall be labeled to designate whether they communicate with liquid or vapor space with the container filled to the maximum permitted filling density. Labels shall be readily visible and may be on or adjacent to the valves closing the openings. Per DOT terminology, the label "SPRAY FILL" may be used in conjunction with "VAPOR". (State Chemist of the State of Indiana; Agricultural Ammonia PT A, Sec V, Rule 5.1; filed Dec 30, 1965, 2:15 p.m.: Rules and Regs. 1966, p. 15; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1638; errata filed Apr 24, 2001, 9:06 a.m.: 24 IR 2709; 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)