70P_2001

70P_2001
BRONZE PEDESTAL
CENTRIFUGAL PUMPS
OBERDORFER PUMPS
MODEL
70P
A Subsidiary of Thomas Industries Inc.
PIPE SIZE: INLET 1 1/4”, OUTLET 1”
Capacity - Water at 70o F
FEATURES
n All Bronze Construction
n Heavy Duty Ball Bearings
n Designed for Pulley Drive
n Mechanical Seal
n Quiet Operation
n Handles Contaminated Liquids
n No Lubrication Required
USES
Silent, efficient, centrifugal pumping is ideal for convenient equipment location in offices, laboratories, public areas,
and living quarters. Long trouble-free service life has made
centrifugal pumps acceptable for industrial uses or wherever
clean or contaminated liquid compatible with bronze is to be
transferred or handled.
The 70P centrifugal pump has an external ball bearing
isolated from the liquid being pumped. The ball bearing is
greased and sealed for life, requiring no maintenance.
CHARACTERISTICS
Oberdorfer centrifugal pumps have a single rotating
metal impeller. Liquid enters at the center and is thrown outward radially by centrifugal force. The impeller is not in contact
with other pump parts resulting in quiet, efficient, pumping
action. The flow produced is not positive which permits the discharge line to be shut off completely without danger of overloading motors or bursting lines. Consequently a relief valve is
not required.
The liquid flow varies directly as the pump speed--the
higher the speed the greater the flow. Horsepower required
varies directly as flow and pressure. Maximum horsepower is
required with a wide open discharge line. This is the point of
maximum flow. With a throttled discharge, the flow decreases
at a greater rate than the pressure increases thereby requiring
less horsepower at the higher pressures. This is known as an
“unloading” feature of the pump.
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This centrifugal pump is not self priming. Normally these
pumps must be installed below the liquid level so that the liquid flows
to the pump by gravity. However, if a foot valve is used at the beginning of the suction line and all air is bled from the suction line and
pump by careful manual priming, these pumps will lift liquid on the
suction side up to 15 ft. Such a system is only as positive as the ability of the foot valve to seal and keep the suction line and pump full
of liquid. If the foot valve should leak, the pump will not prime.
The pedestal centrifugal pumps can be direct driven by electric
motors at either 3450 R.P.M. or 1725 R.P.M. Performance for both
speeds are shown in the curves above. The 70P pedestal centrifugal
pump can be pulley driven at any desired intermediate speed.
Because centrifugal pumps are more efficient at higher shaft
speeds, pumping of viscous or thick liquids is difficult. It is possible
to lose as much as 40% pump performance when attempting to
pump liquids of viscosity equal to S.A.E. 30 oil at room temperature.
S.A.E. 30 oil at room temperature has a viscosity of 2000 Saybolt
Seconds Universal. More viscous liquids are not recommended for
centrifugal pumps.
Heavy liquids can be pumped; however, they demand more
horsepower in direct ratio to the weight of water. For example, carbon tetrachloride has a specific gravity of 1.6 which means it is 1.6
times heavier than water and the horsepower required is 1.6 times
water horsepower.
(continued on back)
PHONE 800-448-1668; (315) 437-0361
FAX (315) 463-9561
BRONZE PEDESTAL
CENTRIFUGAL PUMPS
OBERDORFER PUMPS
MODEL
70P
A Subsidiary of Thomas Industries Inc.
EXPLODED VIEW AND PARTS LIST
1
1
1
1
2
3
4
5
6
7
8
9
10
No.
Screw
Screw
Plug
Body
Gasket
Impeller
Seal
Pedestal
Shaft &
Ret.
Repair
Assembly
Cover
Bearing
Ring
Kit
1 Req'd
1 Req'd
1 Req'd
1 Req'd
32154
5272
5348
5741
5 Req'd 3 Req'd 2 Req'd 1 Req'd 1 Req'd 1 Req'd
70P
1
1
Pump
5504
5633
5395
5266
5307
5267
10693
Repair Kit contains items 5, 6, 7, & 9.
DIMENSIONS
(continued from front)
LIQUIDS AND TEMPERATURES
Bronze pumps are suitable for most common liquids in the
PH-range from 4 to 11.
The temperature limit for bronze pumps is 212oF, higher temperatures are possible with Viton(R)* or Chemlon seals. If in doubt,
consult with factory.
SHAFT SEAL OPTIONS
Mechanical Shaft Seals have Buna rubber components
(212 oF max) as standard. For temperatures up to 400oF a
Viton(R)* seal must be selected by adding code S10 to the
pump number. To handle strong solvents and chemicals
(compatible with bronze), a Chemlon seal (500oF max) must
be specified by adding code S11 to the pump number.
In most instances, Viton(R)* and Chemlon seals are not
field interchangeable with the standard Buna seals. Call factory for details.
*Viton(R)* is a registered trademark of DuPont Dow Elastomers. Viton(R) or equivalent FKM will be used.
1/01
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Specifications are subject to change without notice.
PHONE 800-448-1668; (315) 437-0361
FAX (315) 463-9561
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