E , F & G S E R I E S I N S TA L L AT I O N I N S T R U C T I O N S
These instructions have been provided so that the user can derive the optimum performance from his centrifugal
pumps. Particular attention must be paid to the instructions pertaining to piping, so that the pump will be able
to perform the job for which it was selected. Faulty installation may not only prevent the pump from functioning
properly, but also may cause serious damage.
Anchor the bolts at the lower end of sleeves by means
of large washers. The foundation should be sturdy
enough to support the weight of the pump without
deflection or vibration and large enough to exceed the
length and width dimensions of the base plate by 3 or
4 inches. The top surface should be fairly rough and
irregular, so that grout will adhere to it properly.
MOUNTING THE PUMP: Close-coupled pumps (Figure
1) are assembled into a rigid unit which requires a
minimum of preparation for mounting. Nevertheless,
this type of pump should be bolted down securely;
otherwise, it may shift its position enough to cause the
pump case to crack.
Set pumping unit on unfinished foundation, using
metal shims having a total thickness of 1 to 1-1/2 inches
(available from tool-supply houses or readily made
from rectangular, steel-bar stock) under the edge of the
base near each foundation bolt. Bases which are long
and narrow should be supported by additional shim
stacks and anchors at the mid-point. Wedges should
be leveled so the base clears the foundation by 3/4 to
1 inch.
Figure 1
The close-coupled pump can be mounted in any
position. However, when the pump is mounted in other
than a horizontal position, the pump motor must be
located above the pump so that if leakage should occur,
the dripping liquid will not enter and possibly damage
the motor. Pumps which are close-coupled to engines
must be mounted horizontally, because the engine’s
fuel and lubricating systems will not function properly
in any other position.
Never allow pump to carry weight of piping. Both
suction and discharge piping should be supported
independently at a point near the pump. Piping must
be installed carefully so that it will not be necessary
to force it into place when connecting to the pump.
In unusually long discharge lines, and in lines which
are subject to wide temperature ranges, expansion
joints or other flexible connectors should be used to
compensate for elongation of the pipe due to pressure
or temperature. Flexible connectors also are helpful
as a means of preventing transmission of noise and
vibration. Consult tables showing friction losses in pipe
when selecting pipe sizes.
It is absolutely necessary to provide a perfectly flat,
horizontal mounting surface. Where such a surface
(finished concrete floor, steel or wood deck) exists, it
should be possible to achieve final adjustment by bolting
the base plate directly to this surface and using shims
under pump or motor to correct any misalignment.
SUCTION PIPING: The pump should be installed as close
to the source of liquid as possible. When high suction
lifts (15 feet or more), hot liquids, or intricate suction
piping is involved, a careful check must be made to be
sure that the pump’s required net-positive suction head
(NPSH) will be met. The suction line should be short,
simple and the largest diameter as practical; it should be
placed so that it rises gradually toward the pump and in
such a way that the pump suction is at the highest point
in the suction line. Use as few fittings as possible and
utilize smooth, long-radius fittings where space permits.
A pump foundation must be constructed when a flat
mounting surface does not exist. ln addition to providing
a substantial mounting surface, the foundation, when
designed to elevate the pumping unit above floor level,
may be helpful in protecting pump and driver from
flooding and from alignment-destroying jolts by hand,
trucks, etc., and also helps to minimize vibration.
A concrete foundation should be poured after baseplate bolts have been accurately located. Bolts should
be inserted in pipes or sleeves having diameter 2 or 2
1/2 times as large as the bolt diameter. These sleeves
will permit slight adjustment of bolts to compensate
for inaccuracies in location of bolts or base-plate holes.
Avoid attaching an elbow directly to the pump suction;
use a length of straight pipe or an eccentric reducer to
provide proper entry of liquid into pump. Do not use
throttling valves or orifices in the suction line.These may
cause cavitation which can seriously damage the pump.
E , F & G S E R I E S I N S TA L L AT I O N I N S T R U C T I O N S
If a gate valve must be used in the suction line, locate
it so that its stem extends horizontally or downward.
This will help to eliminate air pockets and leakage of air
through the valve packing. If a foot valve is required to
keep the pump primed, the cross-sectional areas of its
passageways should be 1-1/4 to 2 times the area of the
suction pipe. A strainer, if required, should have 3 to 4
times the area of the suction pipe; otherwise, excessive
friction loss will be caused.
during shipment of the pump, the pump is usually
shipped loosely. All necessary fittings are attached to
the line. Merely insert the line into the tapped openings
in the volute and seal chamber and tighten the fittings.
If the pump is being used in a system that exerts
substantial positive pressure (more than 10 psi) on
the pump suction, it may be advisable to substitute
a longer recirculation line which will connect the seal
chamber to the pump inlet. This substitution will permit
seal chamber pressure to be approximately equal
to suction pressure and thus reduce the amount of
pressure, which must be withstood by the packing or
mechanical seal.
It is especially important that suction piping, on pumps
that operate at a high suction lift, be absolutely free
from leaks. If air is drawn in the suction line through any
leaks, the pump capacity will be reduced and serious
difficulties in maintaining prime may result. When the
suction line draws liquid from an open sump, its lower
end should be submerged sufficiently in such a way
that air is not drawn into the line by vortex action. A
flared suction bell placed on the end of a vertical suction
line will help to compensate for lack of submergence.
A square steel plate attached to the suction pipe, or a
square floating collar around the vertical pipe, will also
help to suppress vortex action.
Larger single-phase motors (either close-coupled or
general purpose) and all three-phase motors must be
provided with a manual starter which incorporates
overload protection. For overload protection as well
as automatic operation (in conjunction with a float or
pressure switch), a magnetic starter must be used.
Electric wiring to the. motor should be sized in
accordance with applicable codes or handbooks.
Undersized wires will cause a voltage drop which may
result in damage to the motor. Be certain the current
characteristics of the electrical are in agreement with
those required by the motor. Verify desired voltage
by checking the instructions for connecting the motor
leads of a dual voltage that appear in the cover of the
motor conduit box.
DISCHARGE PIPING: Discharge piping is not as critical
as suction piping, but care should be exercised in sizing
and laying pipe in order to avoid unnecessary frictional
losses. As in suction piping, the number of fittings
should be minimized and abrupt changes in direction
and size of piping should be avoided.
A gate valve should be installed in the discharge line; it
will be of assistance when priming the pump and will
permit service to be performed on the pump without
needing to drain the discharge line and any connected
vessels. It is advisable to install a check valve in the
discharge line between the pump and gate valve in a
system operating at high discharge heads and with a
foot valve on the suction line. The check valve protects
the pump from pressure surges which occur when the
pump is stopped. In pressure systems without a foot
valve, the check valve prevents reverse rotation of the
pump and loss of pressure in the discharge line if the
pump stops. For systems with very high discharge
heads (above 80 psi), a non-slam check valve should
be used.
PROTECTIVE CONTROLS: If there is any possibility
that a pumping system will allow the pump to run dry
(loss of prime, empty tank, etc.) the pump must be
protected by an automatic control. Contact the factory
for assistance in selecting loss-of-prime switches, lowliquid-level shut-off controls, etc.
Centrifugal pumps (except self-priming models) must
be primed (filled with liquid) before pumping starts. For
pumping systems which have a foot valve on the end
of the suction line, the easiest way to prime the pump
is to fill suction line and pump enough of the discharge
system to establish a liquid level 1 or 2 feet above the
top of the pump case. Any air trapped in the pump case
should be allowed to escape by removing the top plug
until a steady stream of liquid flows from the opening.
Turn the pump shaft by hand to allow any air trapped
within the impeller to escape. Wait several minutes for
air to escape from any horizontal runs of suction pipe.
Replace plug and prepare to the start pump.
Large E, F & G series pumps, whether equipped with
packing or a mechanical seal, are provided with a
recirculation line which allows high pressure fluid
from the pump volute to flow to the seal chamber.
This introduction of higher pressure liquid into the seal
chamber acts as a seal, preventing air from leaking into
the pump when suction pressure is below atmospheric
pressure. To prevent damage to the recirculation line
E , F & G S E R I E S I N S TA L L AT I O N I N S T R U C T I O N S
Pumps equipped with a stuffing box should be checked
for proper adjustment. This adjustment must be made
while pump is running; gland should be tightened
so that a very slight leakage (6-10 drops per minute
remains). This leakage lubricates the packing and helps
prevent excessive wear on shaft, or shaft sleeve and
packing. Pumps furnished with mechanical shaft seals
require no adjustment. If the pump must be shut down
after initial startup, due to exposure to below freezing
weather, protect the pump and connected piping from
damage by draining the system completely or by
introducing a corrosion-inhibiting anti-freeze into the
Correct direction of rotation is assured when pump is
furnished complete with single-phase motor. These
drivers are selected to impart correct rotation to pump.
It is very important, however, to check for correct
rotation when three-phase motors are furnished, or
when drivers of any type are supplied by others.
Check rotation of three-phase motors by turning on
power for only an instant allowing the pump to turn
a few revolutions. Be aware that prolonged operation
of pump in the wrong direction may damage it! Note
whether shaft rotation is in agreement with directional
arrow on pump case. If direction is wrong, obtain
opposite rotation by interchanging any two of the three
wires either at the motor or starter. Close gate valve in
discharge line and start pump.
The rotating parts of the centrifugal pump (impeller,
shaft, seal elements, etc.) are lubricated by the liquid
being pumped. No additional lubrication is required.
Open valve gradually to a half-open position once
driver attains operating speed. If pump fails to function
after a few seconds of operation, stop it and allow it
to remain idle for several minutes. Add more priming
liquid if needed and open air vent (or remove top plug)
briefly to permit any accumulated air to escape. Restart pump; if the pump still fails to function, stop it and
repeat priming and air-bleeding procedure. If repeated
attempts at starting the pump are unsuccessful, check
for leaks in foot valve, suction piping or pump stuffing
PACKED PUMPS (Figures 2 and 3), or pumps with
packed stuffing box, should be adjusted when leakage
becomes excessive by tightening the packing gland
nuts evenly. Never tighten so severely that the leakage
through the packing is stopped entirely. Always have
the pump running while making this adjustment.
When leakage cannot be controlled by additional
tightening, remove packing gland and add one ring
of packing, replace gland and make final adjustments
while pump is running. When packing has been added
in this manner once or twice, it is advisable to remove
all packing the next time that service is required. To
remove old packing either loosen gland and run pump
briefly allowing the pump pressure to force the packing
rings out or use packing removal tools (obtained from
tool-supply houses).
Do not permit pump to run for more than a few seconds
unless it remains full of liquid and is discharging
properly; prolonged operation of an unprimed pump
can cause severe damage to rotating parts.
A discharge pressure gauge, mounted at the pump
discharge will indicate the pressure being developed
by the pump, thereby determining whether the pump
is operating properly. When proper pump operation
is obtained and if the discharge line remains full at all
times, the discharge gate-valve can be opened fully
and allowed to remain open until the pump must be
serviced or reprimed.
Add four rings of new packing so that the ring butt joints
are 180 degrees from each other. This type of packing,
suitable for temperatures up to 200°F is available in
ring form (six rings per set) from the factory. We also
can furnish special packing (such as Teflon®, etc.) for use
in pumps which are handling solvents and corrosive
For pumping systems which are especially large or
which do not incorporate a foot valve, and yet must be
primed in order to overcome a suction lift condition,
other methods of priming are available. Hand-operated
or motor (engine) driven vacuum pumps can be used
to evacuate air from pump case and suction piping; the
vacuum pump must be capable of lifting the priming
liquid to a level above the pump case and within a
reasonable length of time. The discharge line must have
a check or gate valve located near the pump in order to
limit the volume of air to be removed.
The useful life of pump packing is shortened
considerably when the shaft sleeve is worn. It should
be inspected and replaced, if necessary, in accordance
with instructions on next page.
E , F & G S E R I E S I N S TA L L AT I O N I N S T R U C T I O N S
Spacer Sleeve
Spacer Sleeve
Sea adjustments are not required; the seal is lubricated
by the liquid being pumped (unless a special provision
has been made for an external supply of cool or clean
water to the seal). (See Recirculation Line Instructions.)
Occasionally, a new seal may leak slightly during its
first hour of operation, but unless the seal is faulty or
the installation has been done incorrectly, this leakage
will stop. When leakage occurs after the pump has been
used for a long time, a seal must be replaced.
The shaft seal for pump service is a precision product
which must be handled with care. Do not drop the brittle
carbon-sealing washer or seat face, and do not scratch
their lapped surfaces. Damage and consequent seal
malfunction are almost certain to occur if these parts
are mishandled. The pump case, impeller and bracket
must be removed from driver or frame mounted unit
in order to replace the shaft seal. Complete instructions
for dismantling pump and removing impeller can be
found in applicable paragraphs below.
E , F & G S E R I E S I N S TA L L AT I O N I N S T R U C T I O N S
force required to push it along the shaft will be greatly
reduced. Be sure to anticipate this reduction so the
carbon washer will not be fractured by being slammed
against the seat face. Before sliding the carbon washer
up against the seat face, make certain that the lapped
faces are absolutely clean. Wipe both faces with light
oil (never use grease) and then slide seal components
together. Place seal spring on shaft; this applies only
with larger seals (see Figure 4) whose springs are an
integral part of the seal assembly. Replace impeller
washer, impeller, and reassemble pump.
When replacing a shaft seal (see Figure 4), new shaft seal
assembly is required. Individual parts are not available.
Slide the rotating portion of the old seal assembly
(consisting of carbon-sealing washer, rubber bellows,
metal parts and spring) off the pump shaft or sleeve
after the impeller has been removed. Sometimes, the
rubber driving ring of the seal assembly grips the shaft
or shaft sleeve so firmly that the bracket must be used
as a puller to remove seal assembly.
Remove capscrews which fasten the pump case to the
bracket. Separate the case from the bracket; do this
gradually and carefully to avoid damage to these parts
and to possibly salvage the assembly o-ring. This o-ring
will be reusable if not torn and immersed in water until
reinstalled in the pump. The recommeded practice is to
install a new o-ring each time the pump is reassembled.
With small, close-coupled pumps (under 5 HP), it
usually is more practical to leave the case connected to
suction and discharge piping, remove mounting bolts,
then slide bracket, impeller and motor assembly away
from the case.
When dissembling the E-series pump for repair, it is at
times necessary to remove only the front portion of the
case (suction flange); therefore, the discharge piping
need not be disturbed.
Press the old cup seat and ring face out of the bracket.
Lubricate the outside diameter of the new rubber cup
seat with light oil and press the cup seat with seat face
into the bracket cavity making certain that it is seated
squarely in cavity. If the seat and ring cannot be pressed
into place with the fingers, cover the lapped seat face
with the cardboard ring which is packed with each new
seal assembly, and tap seat and ring into place by using
a light mallet with a piece of wood placed squarely
against the seat face. Inspect pump shaft to see that it
is clean and smooth.
Impellers on the E, F & G series pumps slide onto the
end of the shaft and locked in place by a key, impeller
lock screw adapter, lock washer and capscrew. A lock
nut, instead of the cap screws, is used on 50, 60, 75 and
100 HP pumps.
To remove impeller from the shaft, unscrew cap
screw or lock nut after unscrewing set screw (if locked
by set screws), or heat up the lock nut by torch to
approximately 300 °F and apply 300 ft.-lbs. of loosening
torque. These parts have standard, righthand thread. It
may take considerable tapping with a lead hammer,
dousing with penetrating oil and possible application
of heat (by means of a torch) to remove the impeller
from the shaft. Extreme care must be exercised when
striking the impeller, especially if it is cast-iron, in order
to avoid damage.
Use emery cloth to polish the shaft if it is scored or
replace shaft sleeve if pump is equipped with separate
sleeve. Wipe the shaft clean and apply a thin coating of
light oil. Slide the rotating portion of the seal assembly
onto the shaft with the carbon washer facing the floating
seat in the bracket.
Be extremely careful when sliding the rubber portion of
the seal onto the shaft; otherwise, the rubber bellows
will be damaged and leakage will occur. Push only
against the rubber rear face of the element assembly
when sliding it onto the shaft.
Behind this keyed-on type of impeller is an impeller
washer (spacer) and the shaft sleeve. To inspect or
remove the shaft sleeve, first remove the pump bracket
from driver or frame. If the sleeve is so rough and scored
that it cannot be smoothed out with emery cloth, it
should be replaced. A rough sleeve can shorten packing
Installation can be facilitated by using a sleeve that fits
over the shaft and squarevs up against the back of the
seal assembly. Once the assembly is on the shaft, the
E , F & G S E R I E S I N S TA L L AT I O N I N S T R U C T I O N S
tap gently around its entire circumference so that the
ring enters the case or bracket squarely. Be sure ring is
seated firmly. If the new ring can be chilled in a freezer
or ice bath, it will aid in installation.
life drastically; on pumps equipped with shaft seals, a
rough sleeve surface will permit leakage between the
sleeve and the seal’s rubber driving-ring. To remove the
sleeve, strike the rear edge of sleeve with hammer and
chisel until the sleeve moves forward enough to permit
the application of bearing puller. Heating the sleeve
with a torch will assist in this removal operation. Before
replacing the sleeve, clean up the shaft with fine emery
cloth. Wipe the shaft thoroughly, apply a thin film of
grease to the shaft, and place a new shaft-sleeve gasket
or o-ring and o-ring spacer sleeve on the shaft. then
slide the sleeve into place.
The pressure breaker, located in the bracket of stuffing
box models of E, F & G series pumps, helps to reduce
pressure in the stuffing box. If its inside diameter has
become more than .060 inches larger than the pump
shaft diameter, it should be driven out of the bracket
and replaced. If it is not being replaced, its recirculation
holes should be inspected; the holes must be open so
that the pressure-equalizing function of the recirculating
line is unrestricted. The recirculation line should also be
checked to see that it is not clogged.
Put the impeller key in place with its gib-head engaging
the shaft sleeve. Replace impeller washer and impeller.
Replace lock-screw adapter, lock washer, and cap screw
(lock washer and lock nut with set screws for 50, 60,
75, and 100 HP pumps, or Loctite locked-nut for 40 GB4
(40 GM4) and 50 GB4 (50 GM4) pumps.) Assembly of
Loctite locked-nut should be done as follows: (a) clean
and dry thread of shaft and nut; (b) apply Loctite-242
medium-strength to both matching threads portion;
(c) apply 250 ft.-lbs. of tightening torque on nut; (d)
remove excess Loctite and allow 60 minutes of curing
time before use. Recommended tightening torque for
cap screw of 3/8 and 1/2-inch sizes are 35 ft.-Ibs and 80
ft.-Ibs. respectively, and 250 ft.-Ibs. for lock nuts.
Servicing and replacement parts for motors, engines
and other drivers are most readily obtainable from
authorized repair stations which have been established
by the motor and engine manufacturers. Consult factory
for advice on your nearest supplier of repair parts and
Whenever parts are needed for pump or frame unit,
please give the pump model number, specification
letter, and pump serial or unit number. This information
is stamped in the nameplate space marked “pump
model number”. The nameplate normally is attached to
to pump bracket. Only after this information is supplied
can the correct replacement parts be obtained.
Replaceable wear rings are provided if specified in E, F
& G series pump cases and in the larger E, F & G series
pump brackets. When rings are worn until the inside
diameter exceeds the outside diameter of the impeller
eye by more than 0.035 to 0.040 inches, they should
be replaced in order to restore peak performance.
To remove a worn ring, cut ring in one or two places
with a chisel, and pull it out of the case or bracket. Tap
the new ring into place with a lead or plastic hammer;
Your Distributor:
22069 Van Buren Street • Grand Terrace, CA 92313-5607
Phone: (909) 512-1262 • (800) 843-9222
Fax (909) 783-3440 • (909) 422-1787
email: [email protected]
website: www.griswoldpump.com
Printed in the U.S.A.
Copyright 2012 Griswold Pump Company
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