(1)  "Alteration" means a change in any item described in the original Manufacturer's Data Report which affects the pressure containing capability of the container. Rerating a container by increasing maximum allowable working pressure or temperature shall be considered an alteration.

(2)  "Anhydrous ammonia" means a compound formed by the combination of the two gaseous elements, nitrogen and hydrogen, in the proportion of one part of nitrogen to three parts hydrogen by volume. Anhydrous ammonia is ammonia gas in compressed and liquefied form. Anhydrous ammonia is not aqueous ammonia which is a solution of ammonia gas in water.

(3)  "ANSI" refers to American National Standards Institute, 1430 Broadway, N.Y., N.Y. and their publication "Safety Requirements for the Storage and Handling of Anhydrous Ammonia" (as adopted this lst day of January, 1982)  .

(4)  "Approved" means tested and recommended by manufacturer as suitable for use with anhydrous ammonia and product so marked, or inspected by the department and found to be in compliance with these rules.

(5)  "Appurtenances" means all devices, such as, system devices, liquid level gauging devices, valves, pressure gauges, fittings, metering or dispensing devices.

(6)  "ASME" refers to the American Society of Mechanical Engineers, United Engineering Center, 345 East 47th Street, New York, New York 10017 (as adopted this 1st day of January, 1982)  .

(7)  "ASTM" refers to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19103 (as adopted this 1st day of January, 1982)  .

(8)  "Capacity" means the total volumetric measure.

(9)  "Closed system" refers to a transfer system which will return displaced vapor to the tank from which the liquid is being discharged.

(10)  "Container" means a vessel, such as, a tank or cylinder used for the storage and handling of anhydrous ammonia.

(11)  "Department" means the Montana Department of Agriculture, Agriculture/Livestock Building, Helena, Montana 59620, (406)  444-3730.

(12)  "Design pressure" means the maximum allowable working pressure.

(13)  "Filling density" means the percent ratio of the weight of the gas in a container to the weight of water at 60 degrees Fahrenheit (F)  that the container will hold. One pound H20=27.737 cubic inches at 60 degrees F. For determining the water capacity of the tank in pounds, the weight of a gallon (231 cubic inches)  of water at 60 degrees F in air shall be 8.32828 pounds.

(14)  "Filling volume" is defined as the percent ratio of the liquid in a container to the volume of the container.

(15)  "Free vented" as used means the system is permanently open to the atmosphere. No shutoff or check valve is allowed in such opening.

(16)  "Gas" means anhydrous ammonia in either the gaseous or liquefied state.

(17)  "Gas mask" means a gas mask approved by the Bureau of Mines (30CFR Part II, Section 14-f)  .

(18)  "Hold-down devices" refers to chains or metal straps or cables.

(19)  "Hold to a minimum" means the product should be loaded in anticipation of sale into the nurse tanks and delivered to the consumer for use without being stored in nurse tanks waiting for a consumer order.

(20)  "Hydrostatic relief valve" refers to an automatic pressure activated valve for liquid service characterized by throttle or slow weep opening (non-pop off action)  .

(21)  "Implement of husbandry" means a farm wagon-type tank vehicle of not over 2000 gallons capacity, used as a field storage nurse tank supplying the anhydrous ammonia to a field applicator, and moved on highways only for transporting anhydrous ammonia from a local source of supply to farms or fields or from one farm or field to another.

(22)  "Institutional occupancy" is a location where people may be unable to vacate voluntarily and shall be deemed to include nursing homes, hospitals, jails, and schools.

(23)  "Material suitable for use" includes iron, steel and certain non-ferrous alloys which are compatible for use in anhydrous ammonia service. Copper, brass, zinc and certain alloys, especially those containing copper, are not suitable for anhydrous ammonia service.

(24)  "Nitrogen fertilizer solutions" refers to compounds (ammonium nitrate, urea, sodium nitrate, and other nitrogen carriers)  formed by the combination of free ammonia and water with or without other nitrogen salts. Nitrogen fertilizer solutions includes all liquid containing more than 2 percent free ammonia and/or having 5 psig. It does not include material containing over 1 percent of phosphorous and/or potassium which is used as plant food. The term "nitrogen fertilizer solution" should be substituted in lieu of the term "anhydrous ammonia" where it appears in these definitions for references made in rules specified in ARM 4.12.701 for rules specifically pertaining to nitrogen fertilizer solutions.

(25)  "Pressure vented" is a system equipped with a pressure relief valve or a combination pressure-vacuum relief valve.

(26)  "Private assembly" is a location where people gather together but is not generally open to the public.

(27)  "Psig" and "Psia" means pounds per square inch gauge and pounds per square inch absolute, respectively.

(28)  "Public assembly" is a location that is generally open to the public and where people gather together, including but not limited to, churches, public halls, libraries, clubs and businesses.

(29)  "Qualified attendant" means a person who has a knowledge of the characteristics of anhydrous ammonia, its safe handling, safety rules for transfer and application, and has completed an anhydrous ammonia training program conducted by the department or an equivalent training program approved by the department.

(30)  "Repair" refers to the work necessary to restore a container or system to a safe and satisfactory operating condition provided that in all cases the container or system design shall continue to comply with the requirements of this standard, or the standard in effect at the time of installation, that special service requirements do not restrict such work and the basic design concept of the system is not altered.

(31)  "Safety relief valve" or "pop off valve" is an automatic pressure activated valve for vapor service characterized by pop action upon opening.

(32)  "Secured valve" is a valve which is locked, plugged or capped.

(33)  "Semi-trailer" refers to a vehicle designed for carrying anhydrous ammonia, which is drawn by a motor vehicle, and so constructed that some part of its weight and that of its load rests upon or is carried by another vehicle.

(34)  "System" refers to an assembly of equipment consisting essentially of the container(s)  , appurtenances, pumps, compressors, and interconnecting piping.

(35)  "Tank" means a vessel designed and constructed for the storage and handling of anhydrous ammonia.

(36)  "Tank motor vehicle" means any motor vehicle designed or used for the transportation of anhydrous ammonia in any tank designed to be permanently attached to any motor vehicle or any container not permanently attached to any motor vehicle which by reason of its size, construction or attachment to any motor vehicle must be loaded or unloaded without being removed from the motor vehicle.

(37)  "The code" refers to the Unfired Pressure Vessel Code of the American Society of Mechanical Engineers (Sec. 4.12.708 of the ASME Boiler Construction Code)  , including editions through 1981 or the Joint Code of the American Petroleum Institute and the American Society of Mechanical Engineers (API-ASME Code)  including editions through 1981 (adopted this 1st day of January, 1982)  .

(38)  "Vacuum" refers to ounces per square inch of pressure below atmospheric pressure.

(39)  "Vapor pressure" unless otherwise specified, shall refer to the pressure developed by the solution at temperature specified.

(40)  "Wet hose" is an anhydrous hose with shut-off valves at each end and is capable of containing liquid product at all times.