Current through Register Vol. 18, September 20, 2024
(1) This section
applied to containers of 2000 gallons capacity or less and pertinent equipment
mounted on farm wagons (implements of husbandry) and used for the
transportation of anhydrous ammonia. ARM
4.12.704 to ARM
4.12.718 apply to this section
unless otherwise noted.
(2) Design,
working pressure and classification of containers:
(a) containers shall be constructed in
accordance with ARM
4.12.704 with a minimum design
pressure of 250 psig;
(b) the shell
or head thickness of any container shall not be less than 3/16 of an
inch;
(c) all containers over 500
gallons capacity should be equipped with semirigid baffle plates.
(3) Mounting container:
(a) Stop or stops shall be mounted on the
truck, semi-trailer, or trailer or on the container in such a way that the
container shall not be dislodged from its mounting due to the vehicle coming to
a sudden stop. Back slippage shall also be prevented.
(b) A hold-down device shall be provided
which will anchor the container to the vehicle at one or more places on each
side of the container.
(c) When
containers are mounted on four-wheel trailers, care shall be taken to insure
that the weight is distributed evenly over both axles.
(d) When the cradle and the tank are not
welded together, material shall be used between the two to eliminate
metal-to-metal friction.
(4) Container valves and accessories:
(a) All containers shall be equipped with a
fixed liquid level gauge.
(b) All
containers with a capacity of 250 gallons or more shall be equipped with a
pressure indication gauge having a dial graduated from 0-400 psig.
(c) The filling connection shall be fitted
with a positive shutoff valve in conjunction with either an internal
back-pressure check valve or an internal excess-flow valve.
(d) All containers with a capacity exceeding
250 gallons shall be equipped for spray loading or with a vapor return
valve.
(e) All vapor liquid
connections, except safety relief valves and those specifically exempt in ARM
4.12.707 shall be equipped with
excess-flow valves or quick-closing internal valves which shall remain closed
except during operating periods.
(f) Fittings shall be adequately protected
from physical damage by:
(i) a metal box or
cylinder with an open top securely fastened to the container;
(ii) rigid guards, well braced, welded to the
container on both sides of the fittings; or
(iii) a metal dome. If a metal dome is used,
the relief valve shall be properly vented through the dome.
(g) If a liquid withdrawal line is
installed in the bottom of the container, the connections thereto, including
hose, shall not be lower than the lowest horizontal edge of the vehicle
axle.
(h) Both ends of the hose
shall be made secure while in transit.
(5) Marking of container:
(a) Four (4) diamond type, non-flammable,
department of transportation gas placards shall be displayed (one on each side
and one on each end).
(b) The words
"Anhydrous Ammonia" shall appear on each side and each end in letters no less
than two (2) inches high.
(c) The
words "Liquid" or "Vapor" shall be placed on or within 12 inches of the
appropriate valve by means of stencil, tag, decal, or color coding with a
legible legend ORANGE LIQUID and YELLOW VAPOR on the tank.
(6) Farm wagons (implements of husbandry) :
(a) Farm wagons (implements of husbandry) are
as defined in the Montana Motor Vehicle Code.
(b) All farm wagons shall be securely
attached to the vehicle drawing them by means of drawbars supplemented by
safety chains of sufficient size and strength to prevent the towed vehicle
parting from the drawing vehicle in case the drawbar should break or become
disengaged.
(c) A farm wagon shall
be constructed so that it will follow substantially in the path of the towing
vehicle and will prevent the towed farm wagon from dangerously whipping or
swerving from side to side.
(d) All
farm wagons shall have at least five (5) gallons of readily available clean
water.
(7) Nurse tanks
containing anhydrous ammonia shall be stored no less than 50 feet from the edge
of the adjacent road, 150 feet from place of private or public assembly, and
750 feet from place of institutional occupancy.