Sterling SGM-250A User Manual
Water Management Systems
Filtration and Separation Systems
SGM-250A Sand and Gravel Filter
CSM Centri Separator
BFS Bag Filter
SWF Full Flow Strainers
Product Manual
Sterling, Inc.
2900 S. 160th Street
New Berlin, WI 53151
Tel [262] 641-8610
Fax [262] 641-8653
Part Number A0568850 Revision C Bulletin No. SC7-600.4
Sterling/Sterlco is committed
to a continuing program of product improvement.
Specifications, appearance, and dimensions described in this manual
are subject to change without notice.
© Copyright Sterling/Sterlco 2008
All rights reserved. Effective 4/14/2008
Part No. A0568850 Revision C Bulletin No. SC7-600.3
Page 2 Water Management Systems and Products
Safety Considerations
Sterling/Sterlco water management systems products are designed
to provide safe and reliable operation when installed and operated
within design specifications, following national and local safety
codes.
To avoid possible personnel injury or equipment damage when
installing, operating, or maintaining this equipment, use good
judgment and follow these safe practices:
; Follow all SAFETY CODES.
; Wear SAFETY GLASSES and WORK GLOVES.
; Disconnect and/or lock out power before servicing or
maintaining the system.
; Use care when LOADING, UNLOADING, RIGGING, or
MOVING this equipment.
; Operate this equipment within design specifications.
; OPEN, TAG, and LOCK ALL DISCONNECTS before
working on equipment. You should remove the fuses and carry
them with you.
; Make sure that system equipment and components are properly
GROUNDED before you switch on power.
; Do not jump or bypass any electrical safety control.
; Do not restore power until you remove all tools, test
equipment, etc., and the system and related equipment are fully
reassembled.
; Only PROPERLY TRAINED personnel familiar with the
information in this manual should work on this equipment.
Water Management Systems and Products Page 3
Table of Contents
1 Introduction...............................................................5
1-1 General Description
1-2 Sand and Gravel Automatic Backwash Filters
1-3 Centri-Separator Filter Systems
1-4 BFS Series Bag Filters
1-5 SWF Series Full Flow Stainless Steel Filters
2 Shipping Information ...............................................8
2-1 Unpacking and Inspection
2-2 In the Event of Shipping Damages
2-3 If the Shipment is Not Complete
2-4 If the Shipment is Not Correct
2-5 Returns
3 Installation...............................................................10
3-1 Installing the Sand and Gravel Filter
3-2 Installing the Centri-Separator System
3-3 Installing the BFS Series Bag Filter
3-4 Installing the SWF Series Full Flow Stainless Steel Filter
4 Specifications .........................................................13
5 Operation.................................................................14
5-1 Sand and Gravel Automatic Backwash Filter
5-2 Centri-Separator System
5-3 BFS Series Bag Filters
5-4 SWF Series Full Flow Stainless Steel Filters
Page 4 Water Management Systems and Products
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.
Water Management Systems and Products Page 5
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 (SGM250P).
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 300ton (907,200 Kcal/hr) chiller systems. The CSM-150 includes a
1
centrifugal separator,
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.
/3 hp (0.25 kW) pump, 1/2” PVC electrically-
Page 6 Water Management Systems and Products
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