Section 355IAC2-3-4. Prohibited materials

   (a) Storage containers and appurtenances shall not be constructed of copper, brass, zinc, or copper base alloys.

  (b) Storage containers and appurtenances used for the storage of fluid fertilizers containing phosphates or chlorides shall not be constructed of aluminum or aluminum alloys.

  (c) Storage containers and appurtenances used for the storage of low (less than five (5)) pH fluid fertilizers shall not be constructed of ferrous materials other than "316" or "317" stainless steel unless the materials are coated or treated with protective substances that are adequate to inhibit corrosion.

  (d) Storage containers and appurtenances used for the storage of low pressure nitrogen solutions shall not be constructed of mild steel, fiberglass, polyolefins, or plastic. This prohibition does not extend to nonpressure solutions, commonly referred to as twenty-eight percent (28%), thirty percent (30%), or thirty-two percent (32%) nitrogen solutions. This prohibition against the use of mild steel does not extend to aqua ammonia.

  (e) Storage containers and appurtenances used for the storage of phosphoric acid shall not be constructed of ferrous materials other than "316" or "317" stainless steel unless the container is lined with a suitable substance to prevent corrosion.

  (f) Storage containers and appurtenances used for the storage of fluid fertilizers containing potassium chloride (muriate of potash) shall not be constructed of ferrous materials other than stainless steel unless the containers and appurtenances are:

(1) coated or treated with protective substances that are adequate to inhibit corrosion; or

(2) used for storage periods of not more than six (6) months each and are completely emptied between storage periods, cleaned, and inspected for leaks before being refilled for any subsequent period.

(State Chemist of the State of Indiana; 355 IAC 2-3-4; filed Mar 8, 1991, 2:45 p.m.: 14 IR 1392, eff one hundred twenty (120) days after filing with secretary of state; readopted filed Jun 20, 2001, 3:20 p.m.: 24 IR 3822; filed Aug 10, 2005, 1:00 p.m.: 28 IR 3572; readopted filed Apr 27, 2007, 2:03 p.m.: 20070509-IR-355070039RFA; readopted filed Nov 13, 2013, 10:42 a.m.: 20131211-IR-355130442RFA)