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Pier-Mounted Dual Concentric Drum Output Drive Units

Introduction

The DBS Pier-Mounted dual concentric drum output drive unit represents state of the art in reliability and performance. Two independent drive units are stacked concentrically together to drive a rake mechanism and a turbine. The rake drive is a low-speed, high-torque, totally enclosed gear drive with positive output torque overload protection. The turbine drive is a heavy-duty, higher speed, totally enclosed gear drive. The specially designed final output precision bearings provide superior life and reliability in excess of 100 years. The forged alloy steel gears and pinions are designed for a minimum life of 20 years.

DBS Pier-Mounted dual concentric drum output drive units are typically used on solids contact and flocculating clarifiers or softeners. The drive unit is supported by a column in the center of the tank. DBS drive units are mounted on tanks that range from 40 to 300 feet (12 to 100 m) in diameter.

DD-Series Capacities
  • 10-year warranty on main gear-bearing
  • Rake drive has accurate torque gauge calibrated in ft-lbf, N-m
  • or any units required
  • Forged alloy steel main gear-bearing designed for over 20 years of life as calculated per AGMA 2001-D04
  • Variable speed turbine drive is standard
  • Alarm and cutoff switches and maximum torque-limiting via shear pin or pressure relief valve
  • Permanently lubricated rake intermediate gear box, oil bath lubricated main gear housings

Rake Torque Capacity - Pier-Mounted Dual Drives
TURBINE DRIVE POWER1
    Model
Continuous
Maximum Overload
Yield
Allowable
Max. Speed
ft-lbf
N-m
ft-lbf
N-m
ft-lbf
N-m
Horsepower
rpm
D30-A*-D30
16,000
22,000
32,000
44,000
94,000
127,000
25
32
D30-B*-D30
27,000
36,500
54,000
73,000
94,000
127,000
25
32
D42-B*-D42
35,000
47,500
70,000
95,000
195,000
264,000
50
24
D42-C*-D42
51,000
69,000
102,000
138,000
195,000
264,000
50
24
D60-C*-D60
65,000
88,000
130,000
176,000
440,000
597,000
75
17
D60-D*-D60
125,000
169,500
250,000
339,000
440,000
597,000
75
17
D80-D*-D80
165,000
223,500
330,000
447,000
750,000
1,017,000
100
13
D80-E*-D80
250,000
339,000
500,000
678,000
750,000
1,017,000
100
13
D42-B*2-D42
70,000
95,000
140,000
190,000
390,000
528,000
50
24
D42-C*2-D42
102,000
138,000
204,000
276,000
390,000
528,000
50
24
D60-C*2-D60
130,000
176,000
260,000
352,000
880,000
1,194,000
75
17
D60-D*2-D60
250,000
339,000
500,000
678,000
880,000
1,194,000
75
17
D80-D*2-D80
330,000
447,000
660,000
895,000
1,500,000
2,034,000
100
13
D80-E*2-D80
500,000
678,000
1,000,000
1,356,000
1,500,000
2,034,000
100
13
1 For higher horsepower requirements or higher speed, consult factory.
Replace the * with the primary reducer option selected.
Continuous: Torque at which main gear will have a life in excess of 20 years at normal operating speeds.
Maximum Overload: The maximum safe, short term operating torque.
Yield: The structural maximum torque based on the minimum yield strength of the main gear.


DD-Series Dimensions

Item
Description
1
Machine frame
2
Drive drum, rake
3
Main gear-bearing, rake
4
Drive drum, turbine
5
Main gear-bearing, turbine
6
Pinion support bearing, turbine
7
Pinion, turbine
8
Primary speed reducer, turbine
9
Primary drive, turbine
10
Oil drain, turbine
11
Oil drain, rake
12
Primary speed reducer, rake
13
Planetary gearbox, rake
14
Pinion, rake
15
Pinion support bearing, rake

    Model
A
B
C
D
Std. Mounting Flange1
Weight
    
in    
mm    
in    
mm    
in    
mm    
in    
mm    
in
mm    
lb    
kg    
D30-A*-D
48    
1,219    
47    
1,194    
5    
127    
14.25    
362    
32
813    
5,200    
2,359    
D30-B*-D
48    
1,219    
47    
1,194    
5    
127    
14.25    
362    
32
813    
6,400    
2,903    
D42-B*-D
60    
1,524    
60    
1,524    
5    
127    
14.5    
368    
44
1,118    
8,000    
3,629    
D42-C*-D
60    
1,524    
60    
1,524    
5    
127    
14.5    
368    
44
1,118    
8,600    
3,901    
D60-C*-D
84    
2,134    
80    
2,032    
6    
152    
17.75    
451    
62
1,575    
12,800    
5,806    
D60-D*-D
84    
2,134    
80    
2,032    
6    
152    
17.75    
451    
62
1,575    
14,800    
6,713    
    1 Maximum standard outside diameter of mounting flange. For larger flange sizes, consult factory.
    Replace the * with the primary reducer option selected.


Rake Primary Speed Reducer Options

E-type primary speed reducer

The E-type design uses helical gears for speed reduction. It has alarm and cutoff switches and a shear pin to provide triple protection of the drive unit. This design is used where the output speed is outside the limits of the F-type primary speed reducers or when an electro-mechanical type drive unit is desired.

More Information

F-type primary speed reducer

The F-type design uses a hydraulic pump-motor combination for speed reduction. It has alarm and cutoff switches and hydraulic relief (equivalent to a shear pin in the E-type primary speed reducer) to provide triple protection of the drive unit. This design is positive torque-limiting and will operate under stalled and semi-stalled conditions. Optional reversing rotation and variable speed are available. The torque indication and protection system is equally accurate for operation in either direction.

More Information

H-type primary speed reducer

The H-type design has all the features of the F-type primary speed reducer. It uses a stand-alone industrial hydraulic power unit. This design is used on higher horsepower and multiple pinion drive applications.

More Information

W-type primary speed reducer

The W-type design uses helical gears for speed reduction. It has shear pin and shear pin activated cutoff switch to protect the drive unit. This is simplified E-type design used where a torque gauge and adjustable alarm switch are not required.

More Information

Turbine Variable Speed Primary Reducer Options

Mechanical type variable speed reducer

The mechanical variable speed reducer is a ring-cone or a disc design. The output speed varies as the pitch-line distance between two rotating components decreases or increases. The speed variation is adjusted by turning a hand-wheel on the reducer. These reducers include a standard NEMA C-frame on both the input and output connections for easy installation and removal. The reducers provide a 5:1 variable speed range.

Electrical type variable speed reducer

The electrical type variable speed reducer is a variable frequency drive (VFD) that controls the output speed of the electric motor. The VFD can be mounted near the drive unit or at a remote location. VFDs provide a clean, maintenance- free, and economical way of attaining variable speed. Standard features include forward and reverse, speed indication, motor overload protection, soft-start, 4-20 mA signal, and monitoring of operating conditions. These reducers provide a 5:1 variable speed range or 10:1 when used with an inverter duty motor.

Hydraulic type variable speed reducer

The hydraulic type variable speed reducer is a stand-alone industrial hydraulic power unit with a variable volume piston pump and hydraulic motor combination for speed reduction. This design is used when the rake primary speed reducer is an H-type design. A screw located on the pump is turned to change the stroke of the pump pistons and vary the amount of oil delivered to the hydraulic motor, thus varying the final output speed of the drive unit. These speed reducers provide a 3:1 variable speed range.

Ordering Information

Pier-Mounted Dual Concentric Drum Output Drive Unit Model Number Turbine Specification Extension
Series
  Rake Gear
  Pitch Dia.
  (Inches)

 - 
  Secondary
  Speed
  Reducer
  Primary
  Speed
  Reducer
  Number
  of Pinions

 - 
  Turbine   Turbine Gear
  Pitch Diameter
  (Inches)
  Maximum
  Turbine HP

D

30


A



E
F
H

1 (omit)


D

30
42

25
50
B
42
B
1 (omit)
2
42
60
50
75
C
60
C
1 (omit)
2
3
4
60
80
75
100
D
80
D
80
100
E

Example: Model D30-AF-D3015

D is for a pier-mounted drive unit; 30 is the size of the final rake gear pitch diameter in inches; A is the size of the secondary speed reducer; F is the type of the primary reducer; D is for turbine drive; 30 is the size of the turbine gear pitch diameter in inches; 15 is the turbine horsepower.

Standard Features

Alarm and cutoff switches
O&M manual in PDF format
6" torque gauge indicating real torque
(not available on H-type primary reducer)

Optional Features

4-20 mA torque transducer
Bi-directional operation (available for F and H-type primary reducers)
Loss motion switch
4-20 mA lift position transducer
Variable speed, turbine
Variable speed, rake
Special coating
Special electric motor
Oil heater (available for F and H-type primary reducers and main gear housing)
Oil temperature switch
Oil level switch
Explosion proof switches