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Rotary Distributor Center Mechanisms for Trickling Filters

DBS rotary distributor center mechanisms are available in 2, 3, 4, or 6 arm configurations as a rotary reaction type (hydraulically driven) or motorized type (motor driven).

The motorized rotary distributor turns at a controlled speed regardless of flow. This allows the operator to control the dousing rate.

DBS rotary distributors are designed for all standard influent pipe sizes from 8 inches to 48 inches (200 mm to 1200 mm). Standard models are made from steel pipe and plate and are hot dip galvanized. DBS rotary distributors are also available in aluminum and stainless steel construction.

The DBS rotary distributor center mechanism represents state of the art in reliability and simplicity. One specially designed precision bearing supports the entire rotating mechanism. The bearing is top running and is safely away from damaging water and moisture.


        MODEL
MAX. FLOW RATE1
CENTER INFLUENT COLUMN DIAMETER
    
GPM        
LPS        
inches        
mm        
        RD-8
625        
39        
8        
203        
        RD-10
979        
62        
10        
254        
        RD-12
1,410        
89        
12        
305        
        RD-14
1,719        
108        
14        
356        
        RD-16
2,428        
153        
16        
406        
        RD-18
2,914        
184        
18        
457        
        RD-20
3,818        
241        
20        
508        
        RD-24
5,522        
348        
24        
610        
        RD-28
7,270        
459        
28        
711        
        RD-30
8,376        
528        
30        
762        
        RD-36
12,185        
769        
36        
914        
        RD-42
16,460        
1,038        
42        
1,067        
        RD-48
21,630        
1,364        
48       
1,219        
    1 Maximum flow rates are based on a velocity of four feet per second.


Features

Sealless Design
The DBS sealless rotary distributor center mechanism reduces maintenance and breakdowns. If the arms clog and flow backs up into the rotary distributor, the overflow simply discharges between the distribution manifold and influent column. Access ports are provided for easy maintenance and cleaning.

Warranty
A 5-year bearing warranty.

Torque Overload Protection
A shear pin mechanism or a slip clutch device protects the entire motorized rotary distributor in the event binding occurs.

Reversibility–Motorized Models
Motorized rotary distributors can be reversed and back-driven. This feature is particularly useful during start-up and installation.

Options
Stainless steel or aluminum construction.
High-Low flow splitter baffles.

UPPER SUPPORT BEARING
Heavy duty precision bearing for combined thrust, moment, and radial loading. Bearing can be replaced without removing the distribution manifold, arms or influent column.

WEIR
Flow cascades over the stainless steel weir and enters the distribution manifold.

LOWER GUIDE BEARING
A supplemental bearing is provided to prevent the rotary distributor from tipping in the event of extremely unbalanced loads. The bearing is made of high strength, corrosion resistant, maintenance-free, ultra-high molecular weight (UHMW) material.

Dimensions

Item
Description
1
Main gear-bearing
2
Machine cover plate
3
Grease Lubricator
4
Torque overload protection
5
Electric motor
6
Pinon drive speed reducer
7
Pinion
8
Lubrication & inspection cover
dimensions

    Model
A
B
C
Weight
    
in    
mm    
in    
mm    
in    
mm    
lb    
kg    
    RD-8
15    
381    
24    
610    
4.026    
102    
1,600    
726    
    RD-10
15    
381    
28    
711    
5.047    
128    
2,000    
907    
    RD-12
16    
406    
34    
864    
6.065    
154    
2,700    
1,225    
    RD-14
16    
406    
36    
914    
7.981    
203    
3,200    
1,452    
    RD-16
16    
406    
38    
965    
7.981    
203    
3,600    
1,633    
    RD-18
18    
457    
42    
1,067    
10.02    
255    
4,200    
1,905    
    RD-20
18    
457    
46    
1,168    
10.02    
255    
4,800    
2,177    
    1 Metric flanges are available.

Dimensions
Item
Description
1
Oil drain valve
2
Intermediate speed reducer
3
Torque overload protection
4
Electric motor
5
Primary drive speed reducer
6
Pinion
7
Oil fill & inspection
8
Machine cover plate
9
Output drive plate
10
Main gear-bearing


    Model
A
B
C
D
Weight
    
in    
mm    
in    
mm    
in    
mm    
in    
mm    
lb    
kg    
    RD-24
16    
406    
52    
1,321    
5    
127    
21    
533    
5,500    
2,495    
    RD-28
16    
406    
56    
1,422    
7    
178    
23    
584    
6,000    
2,722    
    RD-30
18    
457    
64    
1,626    
9    
229    
25    
635    
8,000    
3,629    
    RD-36
18    
457    
68    
1,727    
11    
279    
27    
686    
9,000    
4,082    
    RD-42
20    
508    
84    
2,134    
13    
330    
29    
737    
11,000    
4,990    
    RD-48
20    
508    
86    
2,184    
15    
381    
31    
787    
12,000    
5,443    
    1 Metric flanges are available.


General Engineering Specification for Rotary Distributors

The Rotary distributor center mechanism shall be of the top running bearing type and shall consist of a stationary influent column, precision bearing, and a rotating distribution manifold. The influent column shall be attached to the support base of the trickling filter. The influent column base plate shall include four leveling bolts for assisting in leveling the rotary distributor during installation. The precision bearing supports the entire rotating mechanism. The distribution manifold shall be bolted to the rotating raceway of the bearing assembly.

The precision bearing shall be a four-point-contact design. The bearing balls shall be separated by Nylon spacers to prevent ballto-ball sliding friction. The bearing shall be oil bath or grease lubricated and have seals to prevent dirt and water from entering bearing raceway. The bearing shall be safely located away from damaging water. The bearing shall be replaceable without removing the distribution manifold, arms, and influent column. The bearing shall have an L10 Life in excess of 100,000 hours.

The influent column assembly and the rotating distribution manifold shall be constructed of steel pipe and flanges. All pipe shall be of standard schedule (0.375" wall thickness) on 12 inch pipe and larger, and schedule 40 on 10 inch pipe and smaller. Bearing mounting flanges shall have a minimum thickness of 1 inch. All welds shall conform to AWS specifications. All exposed steel components shall be near white blast cleaned (SSPC-SP10) and shall be hot dip galvanized, excluding machined surfaces and power train components. If required, an annular baffle for restricting low flow to a portion of the distributor arms and for splitting high flow to all arms shall be provided.

Rotary distributors that are motor driven shall have a power train consisting of an electric motor, intermediate gear reduction unit, and a final reduction pinion and gear. The final reduction gear shall be integral with the top running bearing. Gear teeth shall have a core hardness of 250-300 Brinell. Gear teeth shall be made to AGMA grade 6 or higher. The main gear and pinion shall be rated per AGMA standard 2001-D04 for a life in excess of 200,000 hours. The gear reduction units shall be of the spur gear or helical type to allow the trickling filter to coast after the power is cut off. A torque overload protection device such as a shear pin or slip clutch shall be provided in case binding of the trickling filter were to occur. Power train components shall be protected with a heavy duty paint system.

Ordering Information


Options

Stainless steel or aluminum construction
High-Low flow splitter. Internal annular baffles for flow restriction to the arms
High-Low flow splitter. External flow splitter boxes for flow restriction to the arms
2, 3, or 6 arm design (4 is standard)



Trickling Filter Arms

DBS manufactures arms for trickling filter mechanisms to match the customer’s exact requirements. The arms are designed to distribute large volumes of water evenly over the entire trickling filter.

Features

  • Rectangular cross section arms made from HDG carbon steel, stainless steel, or aluminum.


  • Tapered outer section to maintain uniform water velocity while minimizing weight for longer rotary distributor bearing life.
  • Easily removable UV resistant rubber nozzle grommets of different sizes allow for precise flow distribution to evenly dose the tricking filter media.


  • Water spreader plate runs continuously along the length of the arm.


  • Flushgate at the end of each arm for easy cleaning.