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TM 9-2320-356-BD
e.
Table D-1 identifies fuels or products that can be used as fuels. One of
the best means to increase the available fuel is to use potential substitutes as
extenders by mixing them with the primary fuels and not using them as the sole fuel
source.
This allows some products which could not ordinarily be burned (or pumped)
to be used by diluting them.
Because of the dangers of varying combustibility of
fuels, increased by vaporization during filling, the blending process is very
important.
The most direct and expedient procedure to mix fuels is to add the two
fuels at the same time from two separate fuel lines. If added directly to the
vehicle fuel tanks as separate fuels there is not sufficient turbulence in filling
or shaking by normal driving to provide a properly mixed fuel.
In vehicles with
more than one tank, you could end up with a distinct fuel type in each tank.
D-2.
FUEL BLENDING.
a.
In following the blending procedure, it must be remembered that the basic
fuel is the better of the two fuels and the extender is the poorer. The blending
fuel is the extender.
While you can use up to 50 percent (half and half) of the
extender you should not use more than is needed to obtain the supply needed.
Also,
ensure a fuel tank or container is available to hold the quantity of fuel needed to
perform the mixing operation.
b.
The preferred location to accomplish blending is at a fuel dispensing site
or in fuel dispensing vehicles that utilize their own pumps.
The least desirable
is using the vehicle’s fuel tanks.
Blending in vehicle fuel tanks should only be
done as a last resort because it is imprecise and time consuming.
( 1 ) Blending in Fuel Dispensing Vehicles.
Add the blending fuel to the fuel
tank and mix by connecting the pump inlet hose to the vehicle and recirculating the
fuel for a minimum of 15 minutes.
(2) Blending in 55-Gallon Drums.
Add the blending fuel directly into a drum
and mix by rolling the drum.
(3) Blending in Gravity Feed Tanks (Stationary) not Equipped With Fuel
Transfer Pumps.
Blending fuel can be added manually or by using the pump and meter
of a fuel dispensing vehicle.
Add the blending fuel and mix by recirculating from
the tank outlet to the tank truck pump inlet.
NOTE
Blending in the fuel tanks of using equipment
and vehicles should be undertaken only as a last
resort.
Add both fuels to the fuel tank at the
same time with dual nozzles, or from fuel cans.
c. If expedient fuels are not used completely during the operation, they should
be drained or pumped out.
Fill the vehicle fuel tanks with 10 to 15 gallons of an
approved primary fuel and operate the engine for at least 1/2 hour.
Operate the
engine under a load or drive the vehicle a sufficient distance to bring the engine
up to operating temperature.
D-2
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