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TM 10-3835-231-13
8
Use the hose clamps, as required, to disconnect the hoseline segments and install the ball
receiver in the hoseline at the determined field location. Align the 6-inch end of the reducer
without the internal rod stop toward the end with the displacement ball in it. Install a coupling
clamp over the joined grooved ends.
9
Align the 6-inch end of the reducer with the internal rod stop with the next hoseline segment.
Install a coupling clamp over the joined double grooved ends, thereby connecting the receiver
assembly to the next hoseline segment.
10
Release the hose clamps installed in Step 8 by loosening the screw handle.
11
Attach the air compressor hose to the ball inlet assembly. Release the hose clamp installed near
the ball inlet assembly. Start the air compressor and inject compressed air into the ball inlet
assembly installed in Step 5. Air pressure of 20 to 25 pounds per square inch (psi) is usually
required to move the displacement ball at a satisfactory rate along the hoseline. The air
compressor should be run until the ball is observed entering the ball inlet assembly. A sound will
be heard when the ball reaches the ball receiver. If the ball gets stuck, straighten kinks in the
line. Be observant to ensure that the hose does not become over-pressured.
12
After the ball has entered the ball receiver assembly, stop the air compressor and clamp down
the hose clamp on the downstream side of the ball receiver assembly. Uncouple and remove the
ball receiver from its location and the hose clamps from the evacuated hose segment.
(f)
Air and Fuel Vapor. After the displacement ball has moved completely through the hoseline, you
must still remove the small remaining quantity of fuel, fuel vapor, and air from the hoseline section per
the following procedures.
WARNING
Ensure area is clear of smokers and all open flame or sparking devices. Fuel
vapors and air are very explosive.
1
Using the attached upstream air compressor inject compressed air into the evacuated hose
segment for at least 10 minutes, thereby blowing out any remaining fuel or fuel vapors. Air
pressure of 20 to 25 pounds per square inch (psi) may be required.
4-79
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