4.12.709    HOSE SPECIFICATION

(1)  Hoses used in anhydrous ammonia service and subject to container pressure shall conform to the joint Rubber Manufacturers Association's and the Fertilizer Institute's "Hose Specifications for Anhydrous Ammonia" (Table B of the Joint Association's booklet)  .

(2)  Hoses subject to container pressure shall be designed for a minimum working pressure of 350 psig and a minimum burst pressure of 1750 psig. Hose assemblies shall be capable of withstanding a test pressure of 500 psig.

(3)  Unless the manufacturer indicates otherwise,

(a)  hoses from the date of manufacture shall be changed no longer than as follows:

(i)  every two years for rayon braid hoses;

(ii)  every five years for stainless steel hoses.

(b)  If a verification of the date of purchase or the date the hoses were put into service is made available to the department, then the hoses shall be changed no longer than:

(i)  two years from the date of purchase or placement into service but not to exceed three years from date of manufacture for rayon hoses;

(ii)  five years from the date of purchase or placement into service but not to exceed six years from the date of manufacture for stainless steel hoses.

(4)  Hose and hose connections located on the low pressure side of flow control or pressure reducing valves on devices discharging at atmospheric pressure shall be designed for the maximum low side working pressure. All connections shall be designed, constructed, and installed so there will be no leakage when connected.

(5)  Where liquid transfer hose is not drained upon completion of transfer operations, such hose shall be equipped with an approved shutoff valve at the discharge end. Provisions shall be made to prevent excessive pressure in the hose, see ARM 4.12.710(10)  .

(6)  On hoses one-half inch in diameter or larger which are used for the transfer of anhydrous ammonia liquid or vapor, there shall be etched, cast, or impressed at five foot intervals the following information:

                         Anhydrous Ammonia

                xxx psig (Maximum Working Pressure)  

                 Manufacturer's Name or Trademark

             Year of Manufacture (or replacement date)  

(7)  Hoses used for transferring material (both liquid and vapor)  to and from nurse tanks shall be restricted to a 25 feet maximum length and shall be racked when not in use to prevent undue damage to hose.

History: Sec. 80-10-503, MCA; IMP, Sec. 80-10-503, MCA, NEW, 1986 MAR p. 1820, Eff. 10/31/86.