4.12.713 TRANSFER OF LIQUIDS
(1) A qualified attendant shall supervise transfer
liquids from the time the connections are first made until the rail car is
finally disconnected or the transport truck is completely unloaded and finally
disconnected. Any time a site is unattended, the tank car shall not be
connected to the unloading riser. During the transfer operations of the
transport, chock blocks shall be so placed as to prevent rolling of the
(2) Containers shall be filled or used only upon written authorization of owners.
(3) Containers shall be gauged and charged only in the open air or in a building
especially provided for that purpose.
(4) Pumps used for transferring anhydrous ammonia shall be recommended and labelled
for anhydrous ammonia service by the manufacturer:
(a) Liquid pumps may be piston, rotary, centrifugal or regenerative type for 250
psig working pressure.
(b) Positive displacement pumps shall have installed off the discharge port a
constant differential relief valve discharging through a line of sufficient
size to carry the full capacity of the pump at relief valve setting, which
setting and installation shall be according to pump manufacturer's
pressure gauge graduated from 0 to 400 psig shall be installed before the
relief valve line on the discharge side of the pump.
(d) Centrifugal or regenerative pumps do not require a bypass valve, but the
installation shall incorporate a line from the discharge side of the pump to
the vapor space of the supplying tank and a shutoff valve shall be installed in
(5) Plant piping shall contain shutoff valves located as close as practical to the
(6) Compressors used for transferring or refrigerating anhydrous ammonia shall be
recommended and labelled for anhydrous ammonia service by the manufacturer:
(a) Compressors may be reciprocating or rotary design for 250 psig working
(b) Plant piping shall contain shutoff valves located as close as practical to
relief valve large enough to discharge the full capacity of the compressor
shall be connected to the discharge before any shutoff valve. The discharging
pressure of this valve shall not exceed 300 psig and shall be installed so that
it will be vented in a safe location if
(d) Compressors shall have pressure gauges
graduated from 0-400 psig at suction and discharge.
(e) Adequate means, such as a drainable
liquid trap, shall be provided on the compressor suction to minimize the entry
of the liquid into the compressor.
(7) Loading and unloading systems shall be
protected by backflow check valves or properly sized excess flow valves to
prevent the emptying of the storage container(s) in the event of severance of
(8) Transport vehicles shall not be
utilized for bulk storage of anhydrous ammonia unless incapacitated at an
(9) Railway tank cars must be transferred
at a site that has a permanent storage tank of a capacity equal to 50 percent
of the railway tank car. Sites not able to meet the 50 percent transfer
requirement shall apply to the department annually for a letter of
authorization. The department shall, after inspecting the site and its
facilities and if these are found in compliance with these rules, except for
the 50 percent requirement, issue a one year permit allowing the transfer of
anhydrous ammonia at such site. In the
case of paragraph 11 of this section, no letter of authorization is required.
(10) All transport or railroad loading and
unloading riser liquid and vapor valves must be secured valves or a security
fence with two gates on opposite sides shall be installed and kept locked
during the time the plant is unattended.
(11) The transfer of anhydrous ammonia from
a tank car or transport to any other unit for the purpose of converting
anhydrous ammonia to aqueous ammonia shall only be done upon a railway spur
owned or leased to the operator of such facility where the railway tank car can
be retained for an indefinite period and where an aqueous converter is
installed at a site. The transfer must be done in one continuous operation. The
requirements of ARM 4.12.706 must be met before such site and facility will be
approved by the department. Approved anhydrous ammonia installations designed
for converting aqueous ammonia must have sufficient permanent storage to permit
continuous and uninterrupted unloading from railway tank cars or trucks.
(12) Provision must be made to prevent
bleeding of transport and rail car liquid lines or hoses into the atmosphere
when disconnecting. This shall be done through the use of wet hose with a shut-off
valve at each end of the hose, by bleeding into water at no greater rate than
one gallon of anhydrous ammonia to ten (10) gallons of ammonia-free water
to prevent discharge of fumes into the atmosphere, or with an approved recovery
(13) The filling of mobile containers with
a capacity of 2000 gallons or less with anhydrous ammonia is permissible only
at a permanent storage facility approved by
department for this purpose. Anhydrous ammonia may be transferred from a
transport truck or other vehicle with a maximum capacity of 10,500 gallons into
containers of 2,000 gallons capacity or less mounted on farm vehicles or
containers of 3,000 gallons mounted on motor-driven applicators. This
transfer operation is limited to rural areas and only on the premises of the
History: Sec. 80-10-503, MCA; IMP, Sec. 80-10-503, MCA; NEW, 1986 MAR p. 1820, Eff. 10/31/86.