Section 355IAC3-2-6. Piping, tubing, and fittings; construction

   (a) All piping, tubing, and fittings shall be made of steel or other material suitable for anhydrous ammonia d service. Brass, copper, or galvanized steel pipe or tubing shall not be used.

  (b) Piping used on nonrefrigerated systems shall be at least ASTM A53 Grade B seamless or Electric Resistance Welded Pipe. Pipe joints shall be threaded, welded, or flanged. Pipe shall be at least Schedule 40 when joints are welded or welded and flanged. Pipe shall be at least Schedule 80 when joints are threaded. Threaded nipples shall be seamless. Welding shall be done by a welder certified in accordance with the ASME Code, Section IX, "Welding Qualifications". Tubing joints shall be made up with flared, flareless, or compression type fittings complying with ANSI/ASE J513, ANSI/ASME B31.1, or ANSI/ASME B31.5. Standards refer to current amendments and latest edition of the same.

  (c) All pipe lines shall be installed as nearly as possible in a straight line with a minimum amount of pipe and shall not be restricted by an excessive number of tees or elbows.

  (d) Rigid connections, or all metal flexible connections with a bursting pressure of one thousand (1,000) psig, shall be used for permanent installation. Flexible connections shall be installed and used in accordance with the manufacturer's recommendations. For temporary installations, hose meeting the requirements of this rule may be used. Piping between the tank discharge nozzle and primary pump suction of refrigerated storage systems is exempt from this subsection.

  (e) Adequate provisions shall be made to protect all exposed piping from physical damage that might result from impact by moving machinery, automobiles, or trucks or any other undue strain that may be placed upon the piping.

  (f) After assembly, all piping, fittings, and tubing shall be tested and proved to be free from leaks at a pressure not less than the normal operating pressure of the system.

  (g) All piping, tubing, and fittings shall be designed for a pressure no less than the maximum pressure to which they may be subjected in service.

  (h) All piping shall be supported in accordance with good piping practices, and provisions shall be made as necessary for expansion, contraction, impact, vibration, and settling. All piping should conform to ANSI/ASME B31.3, Process Piping, except ANSI/ASME B31.5, Refrigeration Piping shall be used for refrigeration piping systems within its scope. Standards refer to current amendments and latest edition of the same.

  (i) Cast iron fittings shall not be used. Those parts of valves that are subjected to gas pressure should be made of steel, ductile (nodular) iron, or malleable iron. Valves, in this case, include the following:

(1) Shutoff valves.

(2) Excess flow valves.

(3) Back pressure check valves.

(4) Emergency shutoff valves.

(5) Remotely controlled valves.

Ductile iron shall meet the requirements of ANSI/ASTM A395, and malleable iron shall meet the requirements of ANSI/ASTM A47. Standards refer to current amendments and latest edition of the same.

  (j) Joint compounds shall be resistant to ammonia and all additives present in the system at the maximum pressure and temperature to which they may be subjected in service.

  (k) Underground piping shall be hydrostatically tested at one and one-half (1½) times its working pressure upon installation, repair, modification, or replacement. Newly installed or replacement underground piping other than approved inherently corrosion-resistant materials shall be protected from corrosion or erosion. Some acceptable means for protection are the current amendments and latest edition of the following Standard Recommended Practices established by the National Association of Corrosion Engineers:

(1) NACE Standard RP0275, Application of Organic Coatings to the External Surface of Steel Pipe for Underground Service.

(2) NACE Standard RP0276, Extruded Asphalt Mastic Type Protective Coatings for Underground Pipelines.

(3) NACE Standard RP0375, Application and Handling of Wax-Type Protective Coatings and Wrapper Systems for Underground Pipelines.

  (l) When not in use, the acme threads of all acme fittings shall be covered by a weathercap. (State Chemist of the State of Indiana; Agricultural Ammonia PT A, Sec II, Rule 2.6; filed Dec 30, 1965, 2:15 p.m.: Rules and Regs. 1966, p. 6; filed Jan 19, 2001, 2:04 p.m.: 24 IR 1629; 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)