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| Filtration principles |
Filtering with media filters is also recognized as depth filtration.
The media filters perform the filtration of water through a thick
layer of graded particles. These particles can be sand, gravel or
other granular materials. The filtration rate depends on the
effective size of the bedding and the water velocity through the
filter. Amiad offers a complete line of manifolds, accessories and
control systems For single or multiple media filters. The Amiad
Customer Support Department is at your service in designing
complete media filtration systems with gravel, sand, active carbon
or multi-layer beddings: For manual or automatic operation, For
single or multi-units, manifolded For complete filtration solutions.
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| How the Sand / Media filters work: |
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Water enters through the filter inlet and percolates through the filter bed. When suspended matter comes in contact with media particles, it absorbs it. Clean water Then goes via the filtration nozzles through the filter outlet. Cleaning is done by backwashing. Water is inserted in reverse direction - from the nozzles upwards, causing suspension of the filter bed, thus releasing the suspended matter from the bedding and it is flushed out through a backwash valve. Backwashing may be done automatically according To pressure differential and/or according To time.
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1. Water inlet
2. Water
3. Sand bed
4. Water outlet
5. Filtration
6. Service port
7. Media filling
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| SAND / MEDIA FILTERS |
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| Vessel diameter [mm] |
400 |
500 |
600 |
750 |
900 |
1050 |
1200 |
1500 |
| In/Out diameter |
40mm;11/2" |
50mm; 2" |
50mm; 2" |
80mm; 3" |
80mm; 3" |
80mm; 3" |
100mm; 4" |
100mm; 4" |
| In/Out connection |
Thread |
Thread |
Thread |
Flange / Victaulic |
Flange / Victaulic |
Flange / Victaulic |
Flange / Victaulic |
Flange / Victaulic |
| Flow rate range [m3/h] |
6-10 |
10-18 |
15 - 25 |
15 - 35 |
30-50 |
45-65 |
50-90 |
80-110 |
| Bed depth [mm] |
500 |
500 |
500 |
500 |
500 |
370 |
400 |
400 |
| Bed volume [liters] |
65 |
100 |
140 |
220 |
318 |
320 |
450 |
707 |
| Bed weight [kg] |
96 |
150 |
210 |
330 |
450 |
480 |
690 |
1060 |
| Weight w/o bed [kg] |
55 |
75 |
95 |
155 |
200 |
245 |
285 |
400 |
| Vessel volume [liters] |
90 |
150 |
275 |
372 |
535 |
716 |
926 |
1465 |
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| MULTI-MEDIA FILTERS |
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| Vessel diameter [mm] |
400 |
500 |
600 |
750 |
900 |
1050 |
1200 |
1500 |
| In/Out diameter |
40mm;11/2" |
50mm; 2" |
50mm; 2" |
80mm; 3" |
80mm; 3" |
80mm; 3" |
100mm; 4" |
100mm; 4" |
| In/Out connection |
Thread |
Thread |
Thread |
Flange / Victaulic |
Flange / Victaulic |
Flange / Victaulic |
Flange / Victaulic |
Flange / Victaulic |
| Flow rate range [m3/h] |
6-10 |
10-18 |
15 - 25 |
15 - 35 |
30-50 |
45-65 |
50-90 |
80-110 |
| Bed depth [mm] |
Basalt |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
| Quartz |
400 |
400 |
400 |
400 |
400 |
270 |
300 |
300 |
| Bed volume [liters] |
65 |
100 |
140 |
220 |
318 |
320 |
452 |
707 |
| Bed weight [kg] |
20 |
150 |
180 |
280 |
400 |
360 |
560 |
1100 |
| Weight w/o bed [kg] |
55 |
75 |
95 |
155 |
200 |
245 |
285 |
400 |
| Vessel volume [liters] |
90 |
150 |
275 |
372 |
535 |
716 |
926 |
1465 |
| Maximum working pressure |
6.5 bar |
| Testing pressure |
10 bar |
| Maximum temperature |
60°C |
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| A |
390 |
480 |
610 |
| B |
1185 |
1293 |
1287 |
| C |
876 |
880 |
880 |
| D |
185 |
180 |
180 |
| E |
219 |
266 |
331 |
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| A |
750 |
900 |
1050 |
1200 |
1500 |
| B |
1231 |
1219 |
1219 |
1186 |
1370 |
| C |
1100 |
1100 |
1100 |
1100 |
1265 |
| D |
196 |
196 |
340 |
365 |
400 |
| E |
430 |
505 |
585 |
660 |
814 |
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| DOUBLE-HEIGHT VESSELS |
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