UFC 3-280-03
23 JULY 2003
Table 2-8. Typical filter press plate sizes and weights.
Plate chamber
Press dimensions and weights (based on 32-mm cake thickness)
3
capacity (m )
Plate
25-mm 32-mm
Plate
filtration
Weight (kg)
(1-in.)
(1.25-
size
area per
Number of
Length
Width
Height
thick
in.)
(mm)
chamber
Cast
chambers
(mm)
(mm)
(mm)
cake
thick
2
(m )
Polypropylene
Rubber
iron
cake
plate
plate
plate
20
2200
1210
1900
2240
500
0.288
0.0039
0.0048
1250
1500
40
3850
1700
2760
1760
20
2800
1470
2300
2804
630
0.484
0.006
0.0075
1350
1500
40
4080
2260
3520
4153
20
3440
2570
4020
4760
800
0.889
0.0112
0.0135
1700
1550
60
6000
3420
7620
9760
30
4660
5060
8490
11,870
1000
1.51
0.0192
0.0224
2000
1500
90
8620
7130
17,200
27,100
50
6610
11,350
18,700
27,060
1200
2.1
0.0284
0.035
2200
1800
100
8210
14,150
28,700
45,260
60
7980
16,600
30,000
45,160
1500
3.5
0.045
0.056
2600
1850
120
12,640
22,260
49,000
78,780
2000
5.66
0.0865
0.104
150
17,430
3400
2135
NR
200,000
NR
NR = not reported
Source: Rushton (1982)
Conversions: 1 mm = 0.039 in.; 1 m2 = 10.8 ft2; 1 m3 = 35.3 ft3; 1 kg =2.2 lb.
2-4.5.4 Closing Mechanism. The closing mechanism either hydraulically or
electromechanically closes the plates and maintains the force to hold the plates
constant during the filter cycle period. The hydraulic closing mechanism can either be
manually operated by a jack or automatically controlled by a hydraulic ram and power
pack. The electromechanical mechanism typically consists of a twin or single screw and
electric gear motor. These systems can be equipped with automatic controls to maintain
a constant closing force to compensate for varying sludge feed pressure increases,
compression of the filter cloth and plates, and expansion and contraction of construction
materials with temperature changes.
2-4.5.5 Plate Shifter. Plates can be shifted manually or automatically to remove the
sludge cake after the filter cycle is complete. The typical shifting mechanism is a
semiautomatic or automatic device that works on the principle of an endless chain or
reciprocating bar. These mechanisms involve pawls attached to a chain or bar that
engage with the plate at the end of the plate pack and slide this plate along the plate
support to a distance of 2 to 3 feet, allowing the sludge cake to be discharged. This
process continues for each successive plate until all the plates have been separated
and the filter cake is removed.
2-4.5.6 Optional Equipment. Optional equipment that is typically provided to ensure
safe and successful performance includes safety guards, light curtains, drip trays, and
cake-breaking cables or bars.
2-4.5.6.1 Safety Guards. A fixed guard is one type of safety feature for smaller
presses where it is possible to designate operating and non-operating sides of the
press. Fixed guards typically consist of a metal screen mounted on the non-operating
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