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SPECIAL INFORMATION
ROTATION
Viking pumps can operate equally well in a clockwise or
counter-clockwise rotation; however, some constructions
may require modifications. Consult your Viking Pump
representative if unsure. Shaft rotation determines which
port is suction and which is discharge. Suction port is where
pumping elements (gear teeth) come out of mesh.
If pump rotation is reversed during operation, pressure
protection must be provided on both sides of pump.
Relief valve adjusting screw cap must always point towards
suction side of pump. If pump rotation is reversed, remove
pressure relief valve and turn end for end.
CIRCULATION LINES
This equipment (not utilized on all pumps) must be connected
properly. Packed pumps typically have a flush line from packing
chamber to discharge port. Mechanical seal pumps typically
have a suckback line from seal chamber to suction port. If pump
rotation is reversed, be sure circulation connections are connected
to the suction or discharge port as noted above to avoid excessive
leakage or damage to pump. If pump is handling heated product,
be sure circulation line is insulated to assure continued flow.
SUCKBACK & FLUSH HOLES
Typically, both suction and discharge ports will have pipe plugs
installed in the tapped hole inside the ports. When needed for
added circulation behind the rotor, the suction port hole will be
open, or both the suction and discharge port hole will be open.
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For further details contact your Viking Pump representative.
WARNING !
When replacing a pump casing, pay attention to the use
of the pipe plugs inside the ports and install to match the
previous configuration.
Pumps with Pro-Port™ casing come equipped with a feature
that allows for increased flow of liquid to the back side of the
rotor. In each port is a hole that is plugged with a pipe plug
by default. When pumping high viscosity products ( >23,000
SSU) which are prone to solidification, these pipe plugs can
be removed to encourage the movement of the liquid behind
the pump rotor. At viscosities below 23,000 SSU, leaving these
holes unplugged can result in a lower than expected pump
performance. Typically only one pipe plug would be removed
from the suction port to promote flow behind the rotor. If pump
rotation is changed, the use of this feature would have to be
updated accordingly. Careful attention should be taken to
ensure that pipe plugs are securely installed as loose setscrews
could damage pump internals if they become unseated.
JACKETED PORTS
Jackets are utilized to heat (or cool) the pump and liquid in the
pump prior to startup. Not all pumps have ports for jacketing.
Jacketing port locations vary by model.
PRESSURE RELIEF VALVES
1. Viking pumps are positive displacement pumps and must be
provided with some sort of pressure protection. This may be a
relief valve mounted directly on the pump, an inline pressure
relief valve, a torque limiting device or a rupture disk.
© 2024 Viking Pump, Inc. • Cedar Falls, IA
2. There are relief valve options available on those pump
models designed to accept a relief valve. Options may
include a jacketed relief valve or return to tank relief valve.
3. If pump rotation is reversed during operation, pressure
protection must be provided on both sides of pump.
4. Relief valve adjusting screw cap must always point
®
towards suction side of pump, see "Figure 5" on page
3. If pump rotation is reversed, remove pressure relief
valve and turn end for end.
5. Pressure relief valves cannot be used to control pump flow
or regulate discharge pressure.
For additional information on pressure relief valves, Refer to
Appendix, General Installation Notes, item 5 on Pressure
Protection or contact your Viking Pump
Engineering Service Bulletin ESB-31.
MECHANICAL SEALS
Extra care should be taken in repair of pumps with
mechanical seals. Be sure to read and follow all special
instructions supplied with your pump.
FIGURE 5: RELIEF VALVE POSITION
Suction
MAINTENANCE
These pumps are designed for long, trouble-free service life
under a wide variety of application conditions with minimum
maintenance. The points listed below will help provide long
service life.
LUBRICATION
External lubrication must be applied slowly with a hand
gun to all lubrication fittings every 500 hours of operation
with multi-purpose grease, NLGI # 2. Contact your Viking
Pump
representative with specific lubrication questions.
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Engineering Service Bulletin ESB-515 is located in the
Appendix for standard grease thickener types used by Viking
to check compatibility. Applications involving very high or low
temperatures will require other types of lubrication. O-Pro
should also be greased every 500 hours of operation with a
lubricating fluid compatible with the process fluid.
PACKING ADJUSTMENT
New packed pumps require initial packing adjustment to
control leakage as packing "runs in". Make initial adjustments
carefully and do not over-tighten packing gland. After initial
adjustment, inspection will reveal need for packing gland
adjustment or packing replacement. Contact your Viking
Pump
representative for Engineering Service Bulletin
®
ESB-521 regarding repacking pump.
representative for
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Discharge
Relief Valve Adjusting Screw Cap
TSM 2700 | Issue A | Page 3 of 26
seals
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