Manual 8978584

Manual 8978584
MODEL
121
121B
BRONZE OR ALUMINUM
PEDESTAL HELICAL ROTOR PUMP
CAPACITY - WATER 60OF
GALLONS PER MIN. - WATER & HORSEPOWER*
PIPE SIZE 3/4
Pump
Pressure P.S.I.
R.P.M.
0
20
GPM HP
40
GPM HP
60
GPM HP
80
GPM HP
100
GPM HP
GPM
HP
400
1.4
1/4
1.3
1/4
1.2
1/4
1.1
1/4
0.9
1/4
0.7
600
2.4
1/4
2.3
1/4
2.1
1/4
1.8
1/4
1.6
1/3
1.2
1/3
800
3.6
1/4
3.4
1/4
3
1/4
2.7
1/3
2.1
1/2
1.6
1/2
1000
4.6
1/4
4.2
1/4
3.7
1/3
3.2
1/2
2.7
1/2
2
1/2
1200
5.6
1/4
5.1
1/4
4.6
1/3
3.9
1/2
3.3
1/2
2.6
1/2
1400
6.7
1/4
5.9
1/3
5.1
1/3
4.4
1/2
3.7
1/2
3.1
3/4
1600
7.8
1/4
6.8
1/3
5.9
1/2
5
1/2
4.2
3/4
3.5
3/4
1725
8.5
1/4
7.5
1/3
6.5
1/2
5.5
1/2
4.5
3/4
3.7
3/4
1/4
* Capacitor start electric motor with 1.35 service factor
Pump No.
121
121B
Viscosity
Maximum
Saybolt Seconds
Recommended
Liquid
Universal S.S.U.
Pump R.P.M.
Example
Material
Aluminum
Bronze
FEATURES
• All Bronze or Corrosion Resistant Aluminum
Construction
• Heavy Duty Ball Bearings
• Designed for Pulley Drive Applications
• Quiet Running
• Can Handle Contaminated Liquids
• Carbon Face Mechanical Seal
• Buna Stator and Stainless Steel Rotor
50
1725
Water
500
1400
Corn Syrup
1000
1200
SAE 30 Oil
5000
800
Mineral Oil
10000
600
SAE 50 Oil
50000
400
Molasses
Close fit of the rotor within the stator permits lifting of liquid on the
suction side as high as 20 ft. High starting torque motors are recommended in order to overcome the high starting friction of the stator.
The pump is relatively quiet.
ROTATION
SPEED AND DRIVE
Viscous or thick liquids must be pumped at slower
speeds as indicated in the above table. Speed reduction
from standard electric motor speed can be obtained by pulleys in the direct ratio of speed reduction desired - large pulley on pump, small pulley on motor.
Heavy liquids can be pumped at higher speeds but
require more horsepower in direct amount to their specific
gravity - for example, a liquid with a specific gravity of 1.3
would require 1.3 times the original horsepower.
MATERIALS OF CONSTRUCTION
These pump housings and mounting brackets are made from
cast aluminum or bronze alloy. The rotor is made from stainless steel
with a hard chrome plate for improved wear properties. The stator is
made from molded Buna N. The mechanical seal is a carbon and
ceramic rotary face for positive sealing.
LIQUIDS
CHARACTERISTICS
The turning of the helical shaped rotor within the stationary stator creates a progressing cavity similar to a moving piston. Liquid is thus displaced generating a pumping
action. Unlike piston pumping, extremely high pressure cannot be created because the stator is made of Buna N and is
flexible. Because of this flexibility contaminated liquids can
be handled.
www.oberdorfer-pumps.com
This helical rotor design demands a single rotation - clockwise
when facing the pump drive shaft. Pump rotation and “in” and “out”
ports are indicated on the dimension diagrams on reverse side.
The corrosion resistant alloys used are compatible with common
liquids including water, water solutions, oils and many commercial
chemicals. Severe solvents are not compatible with the Buna and
should not be pumped. Viscous liquids can be pumped, but at slower speeds. Samples of liquids, viscosity and recommended pump
shaft R.P.M. are given on this page. Contaminated liquids can be
pumped because of the flexible Buna stator.
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
MODEL
121
121B
BRONZE OR ALUMINUM
PEDESTAL HELICAL ROTOR PUMP
PARTS LIST
Pump
No.
121
121B
1
2
3*
4
5
6*
7*
8*
9
Screw
Cover
Stator
Body
Plug
Gasket
Rotor
Pin
Universal
Joint
14 Reqd
5897
5897
1 Reqd
5872
6896
1 Reqd
5891
5891
1 Reqd
5873
6897
1 Reqd
5908
5395
1 Reqd
5882
5882
1 Reqd
5890
5890
1 Reqd
5888
5888
1 Reqd
5874
5874
10*
11
12
13
14
15
16
Seal
Ball
Snap
Snap
Pin
Shaft
Pedestal
Assembly
Bearing
Ring
Ring
1 Reqd
1 Reqd
2 Reqd
1 Reqd
1 Reqd
1 Reqd
1 Reqd
32156
5889
5928
5925
5927
5926
5924
32156
5889
5928
5925
5927
5926
6895
* Repair Kit #10737. Kit includes these parts. (and others for 101/101B) as well
as compression plate tool for seal removal.
DIMENSIONS
Pump No.
121 & 121B
C
D
E
13/16 4 9/16 1 3/8
3/06
www.oberdorfer-pumps.com
F
G
H
J
K
L
M
N
O
P
R
12 1/8
2 1/16
5 1/8
1 5/8
11/32
5/8
1 9/16
3 1/2
4 3/8
5 11/16
2 1/2
Specifications are subject to change without notice.
PHONE (800) 448-1668; (315) 437-0361
FAX (315) 463-9561
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