Rules & Regulations of the State of Tennessee
Title 0080 - Department of Agriculture
Subtitle 0080-05 - Markets
Chapter 0080-05-07 - Rules and Regulations Pertaining to Anhydrous Ammonia Storage and Equipment Act
Section 0080-05-07-.03 - BASIC RULES

(a) Containers shall be constructed and tested in accordance with the unfired pressure vessel code of the American Society of Mechanical Engineers, except that construction under paragraphs U-70 and U-200 to U-201 inclusive is not authorized.

(b) The designed working pressure of these vessels shall not be less than:

(a) Each container shall be marked as specified in the following:

(b) The above data shall either be etched, cast or impressed on name plates which shall be irremovably attached to the vessel and located near a manhole, if any, or handhole, or in some conspicuous place. The letters and figures on the name plates shall not be less than 5/32 inches high.

(c) Each bulk storage tank shall be marked on at least two sides with the words "Anhydrous Ammonia - DANGEROUS OR CAUTION" in white letters not less than 6 inches high on a red background or the reverse. In addition the warning sign "No smoking or Open Flame -Allowed".

(d) All transport tanks mounted on trucks and farm trailers shall be marked on both sides and rear with words "Anhydrous Ammonia - DANGEROUS OR CAUTION". Letters are to be at least 6 inches high.

(e) All tanks installed on farm tractors and to be transported over public highways such as in doing custom-work shall be marked on rear side with words "Anhydrous Ammonia -DANGEROUS OR CAUTION" in red letters on a white background. In instances where containers are mounted on side of tractor, the words above specified shall be printed on side of container with similar display of wording on rear of tractor.

(a) Containers shall be located outside of buildings unless the building is especially constructed for this purpose. In case of bulk storage, no bulk storage tanks shall be installed in the limits of any municipality without the approval of their governing body and the Commissioner of Agriculture, and in no instance closer than 200' to any building other than that of the plant operator, or that of a building designed specifically as protection for the plant itself.

(a) All containers shall be equipped with an approved liquid level gauging device so that the maximum volume of container filled by liquid shall not exceed 85% of its water capacity. Containers of 300 water gallons or more shall be equipped also with a vapor pressure indicating gauge graduated to at least 1 1/2 times the working pressure of the container.

(b) All valves and accessory equipment shall be constructed of steel or other material approved for use with anhydrous ammonia, and suitable for a 250 psi working pressure. It is forbidden to use copper or any of its alloys for ammonia equipment.

(c) All connections to containers except safety relief and gauging connections shall have shut-off valves located as close to the container as possible.

(d) Excess flow valves, where required, shall close automatically at the rated flows of vapor or liquid as specified by the manufacturer. The connections and lines, including shut-off valves shall have a greater flow capacity than the rated flow of the excess flow valve.

(e) Openings from tank to fittings for pressure gauge connections and/or other approved gauging devices, shall be protected by a No.54 drill size opening when necessary; or excess flow valve. A hand shut-off valve, with controlling orifice not in excess of 5/16", located as close to the container as possible may be used in lieu of the above on containers of 300 gallons or less.

(f) Openings that require excess flow valve or back pressure check valves, such valve shall be located inside the container or at a point outside where the line enters the container. If installed as in the latter case, installation shall be made in such a manner that any undue strain beyond the excess flow valve or back pressure check valve will not cause breakage between the container and such valve.

(g) Excess flow valves may be designed with a bypass, not to exceed a No.60 Drill size opening to allow equalization of pressure.

(h) All container valves and fittings shall conform to the following:

(a) All fittings where subjected to tank pressure shall be extra heavy construction and only steel (no copper steel), no cast iron, bushings and plugs shall be allowed in the lines or connections.

(b) Galvanized pipe is forbidden to be used as ammonia line pipes; black steel or iron piping of at least 800 pounds minimum test may be used provided welded pipe joints are used. Screwed and bolted flange joints are permissible with double strength pipe. Where screwed joints are used, it has been found that common dopes for pipe threads are attacked by ammonia; freshly mixed Litharge and Glycerin is recommended for use for durability.

(c) All pipe lines shall be installed as nearly in a straight line as possible with a minimum amount of pipe, and not restricted by an excessive amount of elbows and bends. Where nipples are used, they shall be of extra heavy seamless type. Flexible connections shall not be used on permanently fixed installations; rigid connections are required.

(d) Provisions shall be made for expansion, contraction, jarring, vibration, and for settling.

(e) Any section of pipe between shut-off valves that may contain trapped liquid shall be protected by an ammonia relief valve.

(f) Provisions shall be made to adequately protect all exposed piping from mechanical injury that might result from moving machinery, presence of automobiles or trucks, or where any undue strain may be placed upon the piping.

(g) All piping and tubing shall be tested with a pressure of 90 psi after assembly and proved free from leaks. Such test shall be made and certified to by the installer before the system is put into service.

(h) Where hose are used as flexible connections or otherwise, they shall meet the following specifications:

(a) Every container shall be protected with one or more spring-loaded relief valve. Where there is more than one valve on the same container they shall discharge at the same pressure. All relief valves shall be stamped with the name or trademark of the manufacturer, valve number, setpressure at which it begins to discharge, the rating of the valve in the amount of cubic feet per minute it will pass before the pressure of the container exceeds the start to discharge pressure setting of the device plus 25%.

(b) All relief valves shall discharge to the free air and in no case nearer than five feet to any opening into a building.

(c) Container safety relief valves shall be set to discharge as follows with relation to the design working pressure of the container:

Minimum 100% Maximum 125%

(d) All containers shall be protected by relief valve or valves capable of passing the required amount of free air as determined from Table One (1) of these rules and regulations.

(e) Safety relief valves shall have direct communication with the vapor space of the container and no shut-off valve may be installed between the valve and the container except that a shut-off valve may be used where the arrangement of this valve is such as always to afford full required capacity flow through the relief valve.

(f) Rupture disks may be used with spring-loaded relief valves, provided:

(g) Every rupture disk shall have a specified temperature, bursting pressure, and lot number, and shall be guaranteed by its manufacturer to burst within 5% (plus or minus) of its specified bursting pressure. The bursting pressure, temperature, lot number, and discharge capacity in cubic feet per minute shall be stamped on the flange of the disk or upon a metal tag permanently attached thereto.

(h) When two or more safety valves are placed on one connection, this connection shall have a cross-sectional area at least equal to the combined area of these safety valves.

(a) All containers and pertinent equipment, subject to the rules and regulations or bearing the stamp of approval of the Interstate Commerce Commission for the service for which it was designed, and all containers which are owned or in use by the government of the United States of America are exempted from these rules and regulations, except that such containers and equipment shall be subject to inspection by the Commissioner of Agriculture.

(a) All dealers operating systems on the effective date of these rules and regulations, that do not meet the requirements thereof, shall bring such up to specifications set forth herein, within six (6) months after the effective dates of rules and regulations.

(a) No person or dealer shall fill or permit to be filled any container or system that does not have attached thereto a tag of approval (permanent or temporary), issued by the Commissioner of Agriculture.

(b) Systems installed prior to the effective dates of these rules and regulations shall, WITHIN SIX (6) MONTHS thereafter, obtain inspection and approval of the container and/or systems and have securely attached thereto a Metal Tag of Approval issued by the Commissioner of Agriculture.

(c) On a new system installed after the effective date of these rules and regulations, a temporary tag of approval may be attached by the installer, provided said installer furnishes the Commissioner of Agriculture a certificate, certifying that said system is in compliance with these rules and regulations.

(d) The approval of a system bearing a temporary tag of approval shall become NULL and VOID sixty (60) days after the date of issuance of said temporary tag.

(e) The approval of any system or container shall become NULL AND VOID upon resale, alteration, fire or mechanical injury. Such a system or container shall be reinspected by the Commissioner of Agriculture and a new tag of approval attached thereto before put into use.

(a) After the effective date of these rules and regulations, any person who shall install, connect, alter, or extend any anhydrous ammonia system, shall within forty-eight (48) hours after the completion thereof, give notice to the Office of the Commissioner of Agriculture, in writing, which notice shall give full details with reference thereto. The placing of such in the United States mail, postage prepaid, properly addressed to the Commissioner of Agriculture, shall be sufficient notice within the meaning of this paragraph. Provided this ruling shall not apply to farm tractor dispensing equipment when such change or alteration is equivalent to or better than the original installation.

(a) Equipment dealers shall be held responsible for the installation of systems they sell, alter, or connect. It shall be the responsibility of the Fertilizer Dealers to see that the systems they service meet the requirements set forth in these rules and regulations.

(b) The Commissioner's Tag of Approval shall NOT relieve the Dealer of the aforementioned responsibilities. A prefilling inspection of each system shall be made by the servicing personnel every time a system is to be filled, and it is the obligation of the Dealer responsible to see that such is done and report to the Commissioner anything that is not in keeping with these rules and regulations.

(a) Any and all equipment sold or distributed to consumers or users in the State of Tennessee shall be sold or distributed through a Dealer bonded as an Anhydrous Ammonia Equipment dealer in the State of Tennessee.

(a) Any discrepancy found by the Inspector of the Tennessee Department of Agriculture shall be corrected within a given length of time as specified by the Inspector.

(a) Field welding, when necessary, may be done on saddle plates or other non-pressure parts by non-qualified welders. Any welding, when done on pressure parts, shall be done by a qualified welder, and will enter the category of alteration to vessel, and tank shall be reinspected and tested as was originally done to requalify it under the code under which it was built.

(a) Manufacturers shall forward to the Commissioner of Agriculture two copies of the blueprints of each container of a different design prior to its delivery to any person, firm or corporation in the State of Tennessee. One is to be returned to the manufacturer approved or disapproved, such as the case may be. The other copy is to be retained in the file of the Office of the Commissioner.

(b) Manufacturer's data report of each separate tank shall be forwarded to the Commissioner of Agriculture. It will be the dealer's responsibility to see that the manufacturer complies with this and the above ruling. The Commissioner of Agriculture shall have on hand a copy of said data sheet before any inspection is made of said system, installation or container.

(c) Blueprints and data sheets of containers installed prior to the effective date of these rules and regulations shall be obtained and furnished to the Commissioner of Agriculture by the owner before inspection will be made and tag of approval attached authorizing use of container.

(a) Any person, firm, corporation, or association desiring to engage in business as a dealer in anhydrous ammonia as a fertilizer, or as a dealer in equipment used in the handling of anhydrous ammonia as a fertilizer, within the State of Tennessee shall file formal application for permit on form furnished by the Commissioner of Agriculture.

(b) Two types of permits:

(c) Before any permit will be issued all applicants shall comply with the following: