Current through Register Vol. 43, No. 12, March 20, 2024
Each tank truck, semitrailer, and trailer, except implements of
husbandry, used for the transportation of anhydrous ammonia shall meet the
following requirements:
(a) Design
pressure of containers.
(1) Each container
shall be constructed in accordance with K.A.R. 4-10-2b and shall have a minimum
design pressure of 250 psig.
(2)
The shell or head thickness of each container shall not be less than 3/16 of an
inch.
(3) Baffles shall not be
required for any cargo tank that is designed so that the container is loaded to
capacity and discharged at one unloading point. All other containers having a
capacity in excess of 500 gallons shall be equipped with suitable, semirigid
baffle plates.
(4) Except for
safety relief valves, liquid level gauging devices, and pressure gauges, all
container openings shall be labeled to designate whether they communicate with
liquid or vapor space. Labels may be located on valves.
(b) Mounting containers on truck.
(1) The container shall be attached to the
cradle, frame, or chassis of a vehicle in a manner designed to withstand, in
any direction, that amount of static loading equal to twice the weight of the
container when filled and its attachments. The safety factor used shall be not
less than four and shall be based on the ultimate strength of the material to
be used.
(2) "Hold-down" devices,
when used, shall anchor the container to the cradle, frame, or chassis in a
suitable and safe manner that will not introduce an undue concentration of
stresses.
(3) If any vehicle is
designed and constructed so that cargo tanks constitute, in whole or in part,
the stress member used in lieu of a frame, the cargo tanks shall be designed to
withstand the stresses thereby imposed.
(4) All connections, including any hose
installed in the bottom of a container, shall not be lower than the lowest
horizontal edge of the trailer axle.
(5) While in transit, both ends of each
transfer hose shall be secured.
(6) If the cradle and the container are not
welded together, a suitable material shall be used between them to eliminate
metal-to-metal friction.
(c) Container valves and appurtenances.
(1) Each container shall be equipped with a
fixed liquid level gauge.
(2) Each
container shall be equipped with a fully operational pressure-indicating gauge
that has a dial graduated from 0-400 psi.
(3) Nonrecessed container fittings and
appurtenances shall be protected against damage.
(4) Filling connections shall be provided
with approved automatic valves to prevent backflow whenever the filling
connection is broken.
(5) Except
for safety relief valves and those connections specifically exempted by K.A.R.
4-10-2e(b) and K.A.R. 4-10-2e(d), all connections to containers shall be
provided with approved excess-flow valves.
(6) All containers shall be equipped with an
approved vapor return valve.
(d) Safety devices.
(1) The discharge from each safety relief
valve shall be directed upward and away from the container and shall flow in an
unobstructed manner into the atmosphere. Loosely fitting rain caps shall be
used.
(2) Each unloading line
shall be provided with an excess-flow valve at the point where the hose leaves
the truck.
(e) Marking
of containers. Each side and the rear of every container shall be conspicuously
and legibly marked on a background of sharply contrasting color with the words
"anhydrous ammonia" in letters at least four inches high and shall be placarded
in compliance with applicable D.O.T. regulations.
(f) Piping, tubing, and fittings.
(1) All piping, tubing, and metering or
dispensing devices shall be securely mounted and shall be protected against
damage.
(2) Threaded pipe shall be
extra heavy and comply with ASME schedule 80. Standard weight pipe that
complies with ASME schedule 40 may be used if the joints are welded.
(g) Electrical equipment and
lighting. Tank trucks, tank trailers, and tank semitrailers shall not be
equipped with any artificial light other than electric light. Electric lighting
circuits shall have suitable overcurrent protection.
(h) Trailers and semitrailers.
(1) Each trailer or semitrailer shall be
equipped with a reliable system of brakes that comply with D.O.T. regulations.
(2) Each trailer or semitrailer
shall have lights that comply with D.O.T. regulations.
(i) Safety equipment. All tank trucks,
trailers, and semitrailers shall be equipped with the following:
(1) An approved gas mask that has current
ammonia canisters having intact seals and that covers the entire face;
(2) one pair of rubber or suitable
plastic protective gloves;
(3) one
pair of rubber or suitable plastic protective boots;
(4) one rubber or suitable plastic protective
slicker, or rubber or suitable plastic protective rain suit, or both;
(5) a pair of flexible-fitting,
splash-proof goggles; and
(6) a
container of not less than five gallons of clean water.
(j) Transfer of liquids.
(1) Each container shall be loaded by any of
the following:
(A) Weight;
(B) a suitable liquid level gauging device;
or
(C) a suitable meter.
(2) Pumps or
compressors designed and installed in accordance with K.A.R. 4-10-2(j) and
properly protected against physical damage may be mounted on ammonia tank
trucks and trailers.
(k) Protection against collision. Each
end-fitted tank truck and each semitrailer shall be provided with properly
attached steel bumpers or a chassis extension to protect the tank, piping,
valves, and fittings in case of collision.
(l) Conversion from other service to
anhydrous ammonia. Tanks used for the transporting or storage of materials
other than anhydrous ammonia shall be emptied of the material previously
hauled, and the pressure in the tank shall be reduced to atmospheric pressure.
If the material previously hauled in the container will be harmful to the
anhydrous ammonia, then the tank shall be purged before being placed in
anhydrous ammonia service, and all appurtenances shall be changed to comply
with these regulations.
(m) Mobile
containers. Except for tank trucks and semitrailers that comply with K.A.R.
4-10-5a, mobile containers shall be unloaded only at approved locations.
(n) Parking. Except in
emergencies, tank trucks, semitrailers, or trailers transporting anhydrous
ammonia shall not be parked in cities or in densely populated areas.
(o) Conversion of tanks from anhydrous
ammonia to other service. Tanks used for the transportation of anhydrous
ammonia shall be emptied and purged. Ammonia vapor shall be vented into an
adequate portable supply of water and not into the atmosphere. An adequate
supply of water shall be deemed to be five gallons of water per each one gallon
of liquid ammonia. The aqueous ammonia solution resulting from the purging
process shall be disposed of properly.
