Sterling SGM-250A User Manual

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                        Water Management Systems and Products 
Page 5 
1 Introduction 
1-1 General 
Description 
Filtration is used on cooling tower systems or chilled water 
systems requiring removal of large, heavy-duty suspended solids. 
Four filtration systems are available; sand and gravel filters, 
centrifugal separators, bag filters, and strainers.  
 
Sand and gravel filters use two layers of gravel and one layer of 
sand for filtration. It is piped in a by-pass configuration. A timer 
can be preset at any interval to automatically back wash the sand 
and gravel. The SGM-250A sand and gravel filter is designed to 
handle up to 250 ton tower systems and 500 ton chiller systems. 
 
The Centri-Separator System uses centrifugal force by directing 
the water in a circular motion allowing suspended solids to drop 
out and be purged from the system. It is piped in a by-pass 
configuration and is supplied with an integral pump, electrically 
operated ball valve, and controls. A timer can be preset at any 
interval to automatically purge the separator. The CSM Centri 
Separator is available for cooling tower systems up to 400 tons and 
chiller systems up to 800 tons. 
 
BFS bag filters use a 25-micron bag to filter suspended solids in 
either a by-pass or full flow piping configuration. A differential 
pressure alarm is available to warn when bag is full. BFS bag 
filters are available for tower systems up to 150 tons and chiller 
systems up to 200 tons. 
 
SWF Series full flow filters use a strainer basket to filter the water. 
An 80-mesh strainer screen is standard. Other mesh sizes are 
available upon request. The filter housing, strainer basket, and 
flanges are made from 304 stainless steel. A differential pressure 
alarm and automatic purge valve are available as an option.  SWF 
Series full flow filters are available for tower systems up to 650 
tons and chiller systems up to 850 tons.