(a) Excess-flow valves are not required.
(b) Each liquid filling and liquid discharge line must be provided with a shut-off valve located as close to the tank as practicable. Unless this valve is manually operable at the valve, the line must also have a manual shut-off valve.
(c) Except for a cargo tank that is used to transport the following refrigerated liquids: argon, carbon dioxide, helium, krypton, neon, nitrogen, and xenon;, or mixtures thereof, each liquid filling and liquid discharge line must be provided with aan on-vehicle remotely controlled self-closing shut-offshutoff valve. This requirement does not apply to a cargo tank motor vehicle certified before January
(1,) 1995, unless intended for use to transport flammable ladings. If pressure from a reservoir or from an engine -driven pump or compressor is used to open this valve, the control must be of fail-safe design, and spring-biased to stop the admission of such pressure into the cargo tank. If the jacket is not evacuated, the seat of the valve must be inside the tank, in the opening nozzle or flange, or in a companion flange bolted to the nozzle. If the jacket is evacuated, the remotely controlled valve must be located as close to the tank as practicable.
(12) OnEach a cargo tank with a capacity in excess of 3,500 gallons of water, each remotely controlled shut- off valve must be provided with on-vehicle remote means of automatic closure, both mechanical and thermal,. installedOne atmeans themay endsbe ofused theto cargoclose tankmore than one remotely controlled valve. Cable linkage between closures and remote operators must be corrosion resistant and effective in
at
all
least
types
two
of
diagonally
environment
opposite
and
locations
weather
. The thermal means
shall
must
consist of fusible elements actuated at a temperature not exceeding
121 °C (
250 °F
.
)
, or equivalent devices.
One
The
means
loading/unloading
may
connection
be
area
used
is
to
where
close
hoses
more
are
than
connected
one
to
remotely
the
controlled
permanent
valve
metal piping
.
The number and location of remote operators and thermal devices shall be as follows:
(
2
i
) On a cargo tank
with
motor
a
vehicle
capacity
over
of
3,500 gallons
of
water
or less
capacity
,
each
remote
remotely
means
controlled
of
shut-off
automatic
valve
closure
must be
provided
installed
with
at
the ends of the cargo tank in
at least
one
two
remote
diagonally
control
opposite
station
locations.
on
If
the
end
loading/unloading
of
connection
at
the cargo tank
opposite
is
not in
the
main
general
control
vicinity
station.
of
The
one
remote
of
control
these
station
locations,
at least one additional thermal device
must
contain
be
installed so that heat from
a
manual
fire
means
in
of
the
closure.
loading/unloading
In
connection
addition,
area
it
will
may
activate
contain
the
fusible
emergency
elements
control
actuated
system.
(ii)
at
On
a
temperature
cargo
not
tank
exceeding
motor
250
vehicle
°F.
of 3
,
500
gallons water capacity
or
equivalent
less,
devices.
at
One
least
one remote
means
may
of
automatic closure must
be
used
installed
to
on
close
the
more
end
than
of
the cargo tank farthest away from the loading/unloading connection area. At least
one
remotely
thermal
controlled
device
valve
must be installed so that heat from a fire in the loading/unloading connection area will activate the emergency control system
.
[Amdt. 178-77, 48 FR 27705, June 16, 1983, as amended by Amdt. 178-105, 59 FR 55173, Nov. 3, 1994; 60 FR 17402, Apr. 5, 1995
; 68 FR 19282, Apr. 18, 2003
]
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