Pressure Sand Filters
Sand filtration is a frequently used very robust method to remove suspended solids from water.
The filtration medium consists of a multiple layer of sand with a variety in size and specific gravity.
Applications for sand filtration:
- Preparation of cooling water
- Treatment of waste water
- Production of drinking water
- Filtration in swimming pools
- Pre filtration for membrane systems
- Filtration of grey or surface water
Depending on the type of water, suspended solids concentration, oil and grease, COD/ BOD, iron contents, sand filters are sized differently, but the basic design data to clarify natural waters are the following:
| Filtration velocity | 6-15 m3/h.m2 |
| Diameter | 1 to 3m |
| Filtration area | 0.8 to 7 m2 |
| Flow rates | 10 to 100 m3/h |
| Pressure ratings | 4 to10 bar |
| Vessel Materials | Epoxy-coated steel |
| Polyester composite | |
| Stainless steel (on request) | |
| Bed depth | 1 meter min. |
| Filtration media | Anthracite 1.4-1.5 mm
Sand 0.4-0.8 mm Sand 1.0-2.0 mm Gravel 2.0-3.15 mm Gravel 3.15-5.6 mm |
| Top manhole | 2 1/2 to 6″ |
| Accessories | 5-ball or butterfly valves |
| Options | Manometers, degaser, flowmeter |
| Control | Automatic or manual backwash, on timer and/or differential pressure |
Operation Specifications:
- Operating pressure: 25-100 psi (1.73-6.9 bar)
- Operating temperature: 41-122°F (5-50°C)
- Electrical supply: 220V/1Ph/50Hz
Standard Features:
- Time controller for backwash scheduling
- High performance FRP tank/MSEP/SS316/SS304
- 220V/1Ph/50Hz
- Automatic backwash valve
- High quality media
- Operating pressure: 25 – 125 psi (2 – 8.6 bars)
- Operating temperature: 350°-1000°F (20°- 380°C)
- Flow controller to limit backwash flow
Available Options:
- Auxiliary micro switch
- Inlet / Outlet sample valves
- Duplex systems
- Vacuum breaker
- Filters using diaphragm valves
- Stainless steel tanks
- Inlet / Outlet pressure gauges
- Epoxy coated steel tanks