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Page 6 Water Management Systems and Products
1-2 Sand and Gravel Automatic Backwash Filters
Sterling/Sterlco sand and gravel filters are shipped complete with:
• Tank
• Valve manifold
• Gauges
• Initial charge of sand and gravel
The system switches valves automatically. Two backwash control
mechanisms are available. Backwash cycles can be based on a time
cycle (SGM-250A) or pressure differential across the unit (SGM-
250P).
SGM-250A sand and gravel automatic backwash filters are
available in a 250-ton (756,000 Kcal/hr) model for cooling towers
and a maximum-capacity 500-ton (1,512,000 Kcal/hr) chiller
model. The SGM250A model is equipped with automatic valves
operated from a timing device so that the backwash cycle
automatically activates on a periodic basis.
Filters must be installed in a bypass line so that plugging of the
filter or temporary shutdown required for back washing does not
hinder process operation.
1-3 Centri-Separator Filter Systems
Sterling/Sterlco centrifugal separation systems are used on cooling
tower or chilled water systems requiring large capacity, heavy-duty
suspended solids removal.
The Centri-Separator System (CSM-150) is designed to handle up
to 150-ton (567,000 Kcal/hr) cooling tower systems and up to 300-
ton (907,200 Kcal/hr) chiller systems. The CSM-150 includes a
centrifugal separator,
1
/3 hp (0.25 kW) pump,
1
/2” PVC electrically-
activated ball valve, and a 115 volt single-phase 60 hertz control
station. The CSM-150 can be mounted on a pump tank or piped in
a bypass line. The system performs all operations, including
separator purging, automatically.
The CSM-400 is designed for larger tower water system
applications; up to 400-ton (1,512,000 Kcal/hr) cooling tower
systems and up to 800-ton (2,419,200 Kcal/hr) chiller systems.