Sterling SGM-250A Manuale utente
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
Page 2 Water Management Systems and Products
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
Water Management Systems and Products Page 3
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.
Page 4 Water Management Systems and Products
Table of Contents
1Introduction...............................................................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
2Shipping 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
3Installation...............................................................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
4Specifications .........................................................13
5Operation.................................................................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
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.
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, 1/3hp (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.
Water Management Systems and Products Page 7
Note: Centrifugal separation systems must not be used for closed-
loop or chilled water systems; back flushing eliminates
chemicals added to the system.
1-4 BFS Series Bag Filters
BFS Series bag filters can be used for full flow or bypass
applications. BFS Series filters feature single cell 25-micron
polyester filter bags, and include pressure gauges. BFS bag filters
are available for tower systems up to 150 tons and chiller systems
up to 200 tons.
1-5 SWF Series Full Flow Stainless Steel Filters
SWF Series full flow stainless steel filters feature 304 stainless
steel construction of filter housings, strainer baskets, and flanges.
Maximum working pressure is 100 psi (689.5 kPa/6.9 bars); 150
psi (1,034.5 kPa/10.3 bars) is available. Maximum operating
temperature is 110ºF (43ºC); consult the factory for higher
operating temperatures. 80-mesh screen size is standard for the
stainless steel strainer basket; 40 mesh can be used for cooling
tower water applications. Options include ΔP pressure alarm and
automatic purge valve with timer.
Note: Valving and bypass are not included with SWF Series
filters.
BFS Series and SWF Series full flow filters must be installed with
bypass piping so that plugging of the filter or temporary shutdown
required for back-washing does not hinder process operation.
Page 8 Water Management Systems and Products
2 Shipping Information
2-1 Unpacking and Inspection
You should inspect your Sterling/Sterlco water management
systems and products for possible shipping damage.
Thoroughly check the equipment for any damage that might have
occurred in transit, such as broken or loose wiring and
components, loose hardware and mounting screws, etc. In case of
breakage, damage, shortage, or incorrect shipment, refer to the
following sections.
2-2 In the Event of Shipping Damages
Important!
According to the contract terms and conditions of the Carrier,
the responsibility of the Shipper ends at the time and place of shipment.
The Carrier then assumes full responsibility of the shipment.
;Notify the transportation company’s local agent if you discover
damage.
;Hold the damaged goods and packing material for the
examining agent’s inspection. Do not return any goods to
Sterling/Sterlco before the transportation company inspection
and authorization.
;File a claim against the Transportation Company. Substantiate
the claim by referring to the agent’s report. A certified copy of
our invoice is available upon request. The original Bill of
Lading is attached to our original invoice. If the shipment was
prepaid, write us for a receipted transportation bill.
;Advise Sterling/Sterlco. regarding your wish for replacement
and to obtain an RMA (return material authorization) number.
Water Management Systems and Products Page 9
2-3 If the Shipment is Not Complete
Check the packing list. The apparent shortage may be intentional.
Back-ordered items are noted on the packing list. You should have:
;Sterling/Sterlco water management system equipment or
chemical treatment products
;Bill of lading
;Packing list
;Operating and Installation packet
;Electrical schematic and panel layout drawings
;Component instruction manuals
Re-inspect the container and packing material to see if you missed
any smaller items during unpacking. Determine that the item was
not inadvertently taken from the area before you checked in the
shipment. Notify Sterling/Sterlco immediately of the shortage.
2-4 If the Shipment is Not Correct
If the shipment is not what you ordered, contact the parts and
service department immediately at [262] 641-8610. Have the
order number and item number available. Hold the items until you
receive shipping instructions.
2-5 Returns
Important!
Do not return any damaged or incorrect items
until you receive shipping instructions from Sterling/Sterlco.
Page 10 Water Management Systems and Products
3 Installation
3-1 Installing the Sand and Gravel Backwash Filter
Selecting an Installation Site
Place the unit on a suitable and level foundation, preferably a
concrete floor or pad and near the pump for best operation. The
location you select must also have an open drain to a sewer for
backwash, a hookup to city water, and a 110-volt electrical source.
Use a fork lift truck when moving the unit to avoid damage.
Installing the Unit
Be sure that piping to the unit has a bypass circuit. The bypass
circuit allows for removal of the unit for servicing without
interrupting water service. Always run piping full size at 1½” NPT
(approx. 38 mm). Connect the entering water connection of the
filter unit to the process supply and the leaving connection to the
tank. Use 2” NPT (approx. 51 mm) to hook up city water or
process water to the backwash connector piping, as well as to
connect back-flush connections to the city waste or sewer.
Figure 1
Typical Sand and Gravel Filter
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