Oberdorfer Centrifugal Pedestal Pump Model# 83PBS-10
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.
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 83PB 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.
FEATURES
- All Bronze
- Mechanical Face Type Seal
- Fluoroelastomer (S10) or Polytetrafluoroethylene (PTFE) (S11) Seals Available on Special Order
- Heavy Duty Ball Bearings - Designed for Pulley
- Drive Applications
- Stainless Steel Shaft
- Field Convertible to Close Coupled Unit Using
- Standard Keyed Shaft “C” Flange Motor
- May Be Operated with the Shaft Horizontal or Vertical
DRIVE
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 81PB
pedestal centrifugal pump can be pulley driven at any desired
intermediate speed.
Because of the centrifugal pump impeller and body design, rotation
must be as shown in the dimension diagram. Standard factory rotation is
clockwise facing the pump shaft. If the pump is driven in the opposite
direction it will pump only a very small amount.
LIQUIDS & TEMPERATURES
Bronze pumps are suitable for most common liquids
in the PH-range from 4 to 11. The temperature limit for bronze pumps is
212o F, higher temperatures are possible with
fluoroelastomer or
Chemlon seals. If in doubt, consult with factory. 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.
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 horsepower required is 1.6 times water horsepower.
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
Fluoroelastomer or Polytetrafluoroethylene (PTFE) seals.
SUCTION LIFT
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.
