2.3 Supply
Tubing
The supply tubing run should be as short as possible. For flooded suction mounting,
install a shut-off valve with an appropriate tubing connector at the tank outlet. Cut a
length of tubing from the coil supplied and install between the shut-off valve and the
pump inlet fitting. For suction lift applications, install a foot valve on one end of suction
tubing and cut the tubing to a length such that the foot valve hangs vertically about 1 in
(25mm) above the bottom of the tank. Avoid any loops in the tubing run that could form a
vapor trap. Running the tubing through a length of rigid pipe will help to keep tubing
straight (see Figure 4). Total vertical suction lift should be no more than 5ft. (1.5m).
Attach tubing as shown in Figure 5. First slide the coupling nut, small end first, onto the
tubing. Then slide on the clamp ring. Next push the tubing onto the tubing adapter fitting.
(Tips: Place adapter fitting on a flat surface such as a table top and press tubing down on
top of it
all the way to the lip
of the adapter fitting. If the tubing is stiff from cold, dip the
tubing end in hot tap water for a few minutes so it will slide on and flare out more easily.
Slide clamp ring down until it tightens over the adapter fitting. Then slide coupling nut
down as far as it will go. Insert this arrangement into the suction valve housing. With one
hand holding tubing and applying slight downward pressure, tighten the coupling nut until
secure.
WARNING:
All fittings and coupling nuts should be tightened by hand. If necessary,
small pliers may be used to make it snug. DO NOT use excessive force or large wrenches.
TUBING
ADAPTER
CLAMP
RING
COUPLING
NUT
Figure 5 Attach Tubing
2.4 Discharge
Tubing
Cut a length of tubing long enough to go from the pump to the application (injection)
point. Additional tubing can be ordered from your distributor. Avoid sharp bends or
kinks in the tubing and protect the tubing from sharp edges that could chafe or cut it. If
applicable, install the injection valve in 1/2” NPT thread at the injection point and connect
the discharge tubing to the injection valve.
Attach the tubing as described above, installing it to the discharge valve housing.
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