has three filtering stages. In the first stage 15 filter elements remove solid contaminants and coalesce any
water in the fuel. In the second stage, five canisters separate the water from the fuel and let it drain into the
filter/separator sump. Finally, there are 15 go/no go fuses as safety devices to shut off the flow of fuel if the
other two stages allow water or solid contaminants to exceed a safe level. There are three of these fuses in
each of the second-stage canisters. Other parts of the filter/separator include an automatic dump valve, a
manual drain valve, an emergency shutoff control, and three pressure gages. Any water collected in the
filter/separator is removed by the automatic dump valve. This valve is operated by a float that rises in water
and sinks in fuel. Drain water from the unit by opening the manual drain valve located at the bottom of the
sump. Keep the valve open as long as water is running out. When fuel appears, close. While product is
flowing through the separator, check the pressure differential. A 300-GPM positive displacement meter is
located on the right side of the roadside equipment cabinet. The meter counter registers up to 9,999 gallons.
A knob on the side of the meter is used to reset the counter. To do this, the knob is turned clockwise until the
counter is back to zero. The meter also has a totalizer which keeps a record of all issues. There are three
dispensing assemblies on the M131A5C tank semitrailer. One assembly is made up of three 15-foot sections
of 3-inch suction hose. These sections are stored in tubes located on the roadside of the vehicle. The other
two assemblies are housed in the roadside equipment cabinet. The one on the left side of the cabinet is a 0-
55 GPM dispensing assembly. It has a 50-foot section of 1 1/2-inch discharge hose, a hose reel, and a 1
1/2-inch nozzle with a bonding clip and a plug. The assembly on the right side of the cabinet is a 225GPM
dispensing assembly. It has a 50-foot section of 2 1/2-inch discharge hose, a hose reel and a 2 1/2-inch
nozzle with bonding clip and plug. The 2 1/2-inch nozzle comes with two nozzle spouts. The standard 14-
inch spout, standard for most fueling operations is normally attached to the nozzle. The 24-inch spout, used
only for defueling operations, is stored on the left side of the fire extinguisher in the roadside equipment
cabinet. Each dispensing assembly is controlled by a brake assembly and a rewind mechanism. There are
two fusible link connections and two fusible nut connections on the semitrailer. Two fusible links are installed
at the tank compartment discharge valves and two fusible nuts are part of the operating lever assembly. If
there is a fire in any of these places, the fusible links and nuts melt and close the tank compartment
discharge valves.
Figures 3-1. M131A5C 5,000-gallon semitrailer.
3-3
QM 5098
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