
8
Both suction and discharge pipes must be supported
independently near the pump, so that when piping is
connected to the pump, no strain will be transmitted to the
pump. Piping should be arranged with as few bends as
possible, and, preferably, with long radius elbow whenever
possible.
Where vibration noises must be kept to a minimum a
Àexible connection is recommended on both the suction
and discharge lines. This will eliminate any sound being
telegraphed through the pipe system.
NOTE: Flexible connector should have limiting bolts to
contain hydraulic forces.
SUCTION PIPING
A horizontal suction line must have a gradual rise to the
pump. Any high point in the suction pipe can become ¿lled
with air and prevent proper operation of the pump and may
cause loss of prime. The pipe and ¿ttings must be free of
all air leaks.
Any valves or ¿ttings should located at a distance equal
to 5 to 10 times the diameter of the suction pipe from the
pump suction nozzle. If an elbow must be installed at the
pump suction, it should be installed in a vertical position
to reduce unequal Àow into the pump, which may cause
cavitation in the pump (See Figure 4).
There is always uneven Àow in an elbow when it is
installed in any position other than a vertical position. This
unequal Àow allows more water to enter one side of the
impeller than enters the other side causing a reduction
in capacity and ef¿ciency. This condition may also cause
cavitation which would be characterized by noisy operation
and shorter pump life.
An eccentric rather than straight reducer and gate vale with
stem horizontal rather than vertical should be installed in
suction piping. (See Figure 4).
NOTE: A gate valve in the suction piping should not be
used as a throttling device, as this may cause the liquid to
overheat during operation.
DISCHARGE PIPING
A silent type check valve and a gate valve should be
installed in the discharge line. The check valve, placed
between the pump and the gate valve, is to protect the
pump against pressure surges and to prevent water
running back through the pump in case of failure of the
driver. The gate valve is used in priming, starting and when
shutting down the pump. This is especially important when
the pump is operated against a high static head.
if increasers are used on the discharge side increase the
size of discharge piping, they should be placed between
the check valve and pump.
7. LUBRICATION
Grease Lubricated Bearings
Grease lubricated bearings are prelubricated at the
factory before shipment. See LUBRICATION Section C for
recommended lubricants.
Oil Lubricated Bearings
Pumps furnished with oil lubricated bearings are shipped
WITHOUT oil in the housings (31) & (33). To ¿ll the oil
reservoir in the housing:
1. Install the Trico Opto-Matic constant level oiler (125)
with piping as shown with the moveable oiler body at
its lowest position.
2. Unscrew the plastic bottle from the oiler.
Fill bottle of the oiler and screw ir onto the lower
reservoir. Several ¿llings of the bottle will be required
before the oil level in the bearing reservoir is equal
to the level for which the oiler is adjusted. NEVER
FILL FRAME RESERVOIR THRU LOWER
RESERVOIR OF THE OILER. See LUBRICATION,
Section C, for recommended lubricants. When
proper oil level is obtained, re¿ll and replace the
plastic bottle on the oiler. See LUBRICATION,
Section C, for proper oil level.
Packing Box
The pump may be furnished with packing or mechanical
shaft seal, as ordered.
Packing is continuously lubricated internally with pumped
Àuid. External lubrication may be provided through tapping
opening, provided by-pass is plugged with item (263).
Mechanical seals ca be lubricated by:
1. The internal by-pass which leads from the volute
to the packing box. When using the internal by-pass
it is recommended that the tap in the seal gland be
used for the vent.
2. Plugging the internal by-pass with a socket head
pipe plug (263) and using an outside source. When
using an outside source, it is recommended to use
the tap in the seal gland for the inlet and outside tap
of the internal by-pass for the vent.
Other Lubrication
For proper lubrication of driver bearings and shaft
couplings, see manufactures instructions.
8. WIRING
For electric motor drives, connect power supply to conform
with national and local codes. Line voltage and wire capacity
must match the ratings stamped on the motor nameplate.
9. ROTATION
Before starting the pump, check the required direction
of rotation of the pump. The proper direction is indicated
by a direction arrow on the pump casing. Separate the
coupling halves, then start motor to see that it rotates in
the direction required by the pump. If it does not, reverse
any two main leads of the 3-phase wiring to the motor.
The coupling halves can be reconnected and the pump
primed for starting.