sludge dewatering equipment
sludge dewatering systems

Dewatering Screws

sludge dewatering equipment

Sand Classification System with Sludge Dewatering Equipment

Fine Material Dewatering Screws
With single and twin auger designs available, GreyStone dewatering screws are built for economical, long-life production. From our externally mounted pillow block bearings to oil-bath sealed gear reducer drives, most GreyStone components are standard, off-the-shelf items to facilitate maintenance and reduce downtime. With a low-profile, custom-built design, our E-Series dewatering screws range in size from 12" x 14' to 36" x 25' and are capable of producing up to 200 TPH. Our larger, standard series are available in sizes from 36" x 28' to 84" x 38' and can produce up to 1000 TPH.

Model "E" and Standard Dewatering Screw Features

More information on sludge dewatering Systems

MOTOR AND DRIVE ASSEMBLY
The shaft mounted gear reduction is totally enclosed within an oil bath gear box. The reduction is designed with easy service and customer convenience in mind. By simply changing the drive pulley on the motor, you may increase or decrease the speed to custom tailor the washing action on your material. All standard electric motors are 230/460 Volt, 3-phase, 60 cycle. Parts required for routine maintenance are standard off-the-shelf items and are easily found in most metropolitan areas nationwide.

SHAFT-MOUNTED GEAR BOX DRIVE
A greatly improved drive is used on all GreyStone washers. Based on the use of standard, direct, shaft-mounted speed reducers, the drive provides several significant advantages.

  • The drive is fully enclosed, with all gears running in a sealed oil bath.
  • Maintenance is economical since only stock reducers are used.
  • The drive is simplified by reducing the number of shafts, bearings,
     and other components.
  • The transmission is highly efficient because of the direct shaft arrangement,
       with V-belt drive to electric motor and belt guard.
  • Falk or Dodge shaft-mounted gear reduction drives are used and
       are readily available.

SHAFTING
The heavy stub of mirror-smooth, heat-treated shafting is fitted into a hard stainless steel spacing sleeve. Shaft and sleeve are driven through a heavy duty rubber gasket that fits snugly between the connecting disc and tub. A specially designed slinger fits perpendicular to the shaft between the roller bearing and sleeve and turns with the shaft adding further protection to the outside mounted bearing from the seal leakage which may follow extensive use.

SHAFT AND FLIGHTS
The spiral-type, half pitch steel flights are welded to a heavy tubular steel shaft. Each spiral screw flight is formed by a special machine to ensure a uniform spiral. The shaft flanges are precision ground after they have been welded onto the heavy tubular steel shaft.

ADJUSTABLE SCREW SHAFT
The adjustable screw shaft makes a unique design. This will allow you to control the clearance between the belly pan and screw flights...Exclusively from GreyStone.

ADJUSTABLE WEAR SHOES
Heavy-duty 1-inch-thick rock-grade rubber wear shoes are used on GreyStone Washers. These shoes can be adjusted 3/4" for years of additional service. Rubber will outwear other material at approximately half the replacement cost.

EXTERNAL BEARING
GreyStone Sand Dewatering Screws have externally mounted pillow block bearings that are standard, off-the-shelf components for easy replacement.

LARGE HEAVY-DUTY TUB
Strong and rigidly constructed screw washers are designed to provide years of maintenance-free service. GreyStone tubs are all welded construction and are made of heavy steel plate with angle iron skid frame. GreyStone machines have a heavy belly pan which is curved to fit tightly to the screw shaft. During operation, this feature keeps sand from slipping back and increases your production.

THREE-SIDE OVERFLOW
GreyStone's large tub gives maximum weir length and maximum sand recovery. The GreyStone classifier features a three-side overflow flume with adjustable weirs. Weirs can be set to control the amount of fines to be retained or rejected. Efficient overflow distribution assures quiet pool area to prevent fine sand from flushing out with waste water.

FEED BOX AND SKIRT
The feed box is designed to effectively control the velocity of the aggregate being introduced into the screw tub. This will reduce turbulence within the pool area and allow a uniform flow of material.

RISING CURRENT BELLY PAN
The rising current water enters the pool from the bottom and filters up, separating fines, dirt and other extraneous matter, which is carried to the top and forced out with the overflow.

CLEAN-OUT DRAIN
An easily operated clean-out valve is provided for complete draining of the reservoir on the lower end of the tub.

HEAVY-DUTY SKID FRAME
GreyStone standard series washers are equipped with a heavy-duty skid frame. Pull a GreyStone to where it is needed without using a crane…an Exclusive GreyStone Feature.

SEND US A SAMPLE
Send us a sample of your pit run material for a free examination and recommendation for the best equipment selection to meet your requirements.

Standard Dewatering Screw Specifications

SINGLE UNITS

Size

TPH

Screw
Speed
FPM

RPM

Max. Mat.
Size

hp

Overflow Water Capacity

100 M*

150 M*

200 M*

36" x 28'

100
75
50

200
150
100

20
15
10

3/8

15
10
7.5

700

330

160

44" x 32'

175
130
85

200
150
100

17
14
10

3/8

20
15
10

1600

750

425

48" x 32'

200
150
100

200
150
100

16
12
8

3/8

25
20
15

1700

850

450

54" x 35'

275
210
140

200
150
100

15
12
8

3/8

30
25
20

1900

950

575

60" x 35'

340
255
170

200
150
100

13
9
5

3/8

30
25
20

2200

1050

600

66" x 35'

400
300
200

200
150
100

14
11
8

3/8

40
30
25

2400

1200

650

72" x 38'

475
360
240

235
180
126

13
10
7

3/8

50
40
30

2600

1300

700

84" x 38'

600
450
300

260
160
110

11
8
5

3/8

60
50
40

3100

1600

850

TWIN UNITS

36" x 28'

200
150
100

200
150
100

20
15
10

3/8

(2) 15
(2) 10
(2) 7.5

1250

620

340

44" x 32'

350
260
170

200
150
100

18
14
10

3/8

(2) 20
(2) 15
(2) 10

2800

1400

675

48" x 35'

400
300
200

200
150
100

16
12
8

3/8

(2) 25
(2) 20
(2) 15

3000

1450

750

54" x 35'

550
412
275

200
150
100

15
12
8

3/8

(2) 30
(2) 25
(2) 20

3500

1750

950

60" x 35'

680
510
340

200
150
100

13
9
5

3/8

(2) 30
(2) 25
(2) 20

3700

1800

975

66" x 35'

800
600
400

200
150
100

14
11
8

3/8

(2) 40
(2) 30
(2) 25

4000

2000

1200

72" x 38'

950
710
475

235
180
126

13
10
7

3/8

(2) 50
(2) 40
(2) 30

4500

2200

1250

*M = MESH SIZE RETAINED WHILE OVERFLOWING ESTIMATED G.P.M.

The tonnage capacity tables given here are based upon peak operation of the unit. Be sure you select a unit large enough for the peak load (100 lbs. per cubic foot aggregate).

Model "E" Specifications

SINGLE UNITS

Size

TPH

Screw
Speed
FPM

RPM

Max. Mat.
Size

hp

Overflow Water Capacity

100 M*

150 M*

200 M*

12" x 14'

20
15
10
5

120
90
60
30

40
30
20
10

3/8"

3

150

100

50

24" x 24'

50
38
25

200
150
100

32
24
16

3/8"

7.5
5
5

500

225

125

30" x 24'

75
60
50

200
150
100

25
19
13

3/8"

15
10
7.5

575

275

160

36" x 25'

100
75
50

200
150
100

20
15
12

3/8"

15
10
7.5

700

330

180

TWIN UNITS

24" x 24'

100
76
50

200
150
100

32
24
16

3/8"

(2) 7.5
(2) 5
(2) 5

890

420

235

30" x 24'

150
120
100

200
150
100

25
19
13

3/8"

(2) 15
(2) 10
(2) 7.5

1000

490

280

36" x 25'

200
150
100

200
150
100

20
15
10

3/8"

(2) 15
(2) 10
(2) 7.5

1250

620

340

*M = MESH SIZE RETAINED WHILE OVERFLOWING ESTIMATED G.P.M.



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