PROCESS & compression SYSTEMS
WEMCO Silver Band
WATER
Proprietary Filtration Technology
Cameron’s WEMCO Silver Band filters are used for tertiary treatment of produced waters.
The WEMCO® Silver Band system is a high-performance,
downflow media filter. It typically can remove 98% of
suspended solids and insoluble hydrocarbons in most
applications.
MEDIA
FLUIDIZATION
PUMP
F
VENT
FILTER
MEDIA
The key to the Silver Band media cleaning is an exclusive
fluidization process that strips oil and contaminants from
the media. This process eliminates the need for gas/oil
scouring, surfactants or high volumes of backwash water.
SCRUBBER
SCREEN and
NOZZLE
MEDIA
SUPPORT
SCREEN
Scrubber screen nozzle
Simple, superior design means
low system costs
MEDIA
OUTLET
Our filter system design and proprietary filter media
provide efficient bulk separation of oil and solid
contaminants from liquid streams. In the WEMCO Silver
Band system, a stainless steel media support screen is
situated on supports near the bottom of the vessel. A
fluidization nozzle located in the top center of the filter
extends down to the top of the media. Inside of the
fluidization nozzle is the stainless steel scrubber screen.
This screen allows the dirty fluid to exit the vessel, but
retains the media.
A
B
DIRTY-WATER
INLET
NORMALIZATION
DISCHARGE
E
D
CLEAN-WATER
OUTLET
DRAIN
BACKWASH
DISCHARGE
C
The simple, automatic design means low system costs for
several reasons:
Pecan/walnut shell media
•T
he system requires less floor space than other deep-bed
filters.
Filtration media that cleans better
and lasts longer
•T
he designed flux rate of 13.5 to 15 gal per min/sq ft
necessitates smaller and fewer filters for specific
applications.
The pecan/walnut shell media used by the WEMCO Silver Band
system is more efficient and cost-effective because it:
• F ilters use raw inlet water for regeneration, eliminating
the need for clean-water backwash storage tanks.
•E
ach filter contains its own pump for backwash
fluidization, eliminating the need for large auxiliary
backwash pumps, associated piping and control.
•C
hemicals, air, or gas typically are not required to
enhance removal efficiency or media cleaning during
filtration or regeneration, with the following benefits:
° Corrosion and environmental problems are reduced.
° Filtrate quality is independent of outside interaction.
° Byproduct waste is free of chemical contamination,
allowing easy treatment.
° Separate normalization outlet allows reduction of
•R
emoves 98% of contaminants with particle size higher than
two microns (in most applications)
•R
emains unaffected by heavy oil surges, resisting oil fouling
better than other media
• Is resistant to fouling by chemicals in the feedstream
•C
auses no downtime due to oil buildup, screen plugging or
too-frequent backwashes
• Is durable and easy to clean, so it never requires a complete
change, but only an average of 5% to 10% replenishment
per year (based upon recommended backwash operation)
In addition, the system provides the lowest backwash volume
of the nutshell media filters available. Often, this is 30% to 50%
less waste volume, reducing the size of the associated tankage
and handling equipment.
waste volume by 1/3 to 1/2 of other standard systems.
Data Sheet | TC9814-069
PROCESS & compression SYSTEMS
Separation process
F
Filtration Cycle
During the filtration cycle of the WEMCO Silver Band filter
system, the dirty fluid passes through valve “A” and enters
the side of the vessel. The fluid is forced through the
media, where solids and oil are removed. Any gases and
F
A
B
INFLUENT
DRAIN
E
EFFLUENT
D
NORMALIZATION
BACKWASH OUTLET
C
A
B
INFLUENT
DRAIN
E
D
EFFLUENT
NORMALIZATION
BACKWASH OUTLET
C
free oils float to the top and are bled off through valve
“F.” The clean, filtered fluid exits through valve “E.” The
filtration cycle terminates in one of three ways:
• Time lapses (automatic – 30 hours maximum)
• Differential pressure (automatic – 16 psig)
• Manually
Regeneration Cycle
Once the filter is isolated, the regeneration cycle consists
of four steps:
Step 1: Fluidization The first step in the regeneration cycle
is the fluidization of the bed. During this step, valves “E”
and “A” close, valve “B” opens, and the fluidization pump
is turned on. The fluid in the vessel passes through the
fluidization pump and down the inside of the fluidization
nozzle that surrounds the separator screen. This “jet
action” of fluid passing through the nozzle breaks up and
liquifies the media bed. The media then circulate through
the fluidization pump, causing a shearing action that strips
the oil and contaminants from the media. The entire bed is
fluidized in a few seconds.
Step 2: Discharge After the bed is fluidized, the actual
discharge of the accumulated contaminants begins. Valve
“C” opens. The feed water enters through valve “B” and up
through the bottom of the vessel, thus cleaning the bottom
screen. The fluid containing solids and oils passes through
the separator screen and out through valve “C.” The media
continue to pass through the fluidization pump and down
F
• Fluidization (repeated later in the process)
• Discharge
• Settling
• Normalization
A
B
INFLUENT
DRAIN
E
C
D
EFFLUENT
NORMALIZATION
BACKWASH OUTLET
Data Sheet | TC9814-069
PROCESS & compression SYSTEMS
the outside of the separator screen. This prevents any
media from exiting the vessel, but allows the contaminants
to flow out through the discharge line. The discharge
process lasts for the amount of time set by the control
panel, typically 11 minutes. The fluidization step is repeated
here to ensure the scrubber screen is clean.
Step 3: Settling The next step in regeneration is a delay
cycle that allows the media granules to settle. Valve “C”
closes, which stops the discharge cycle. Valve “A” opens,
F
remain in the bottom of the vessel and compact the media
bed. Valve “D” opens, allowing the influent to be filtered
while passing through the media bed and forcing all
contaminated fluids out of the filter. Since this is filter inlet
fluid, introduced into the lower portion of the filter during
the backwash sequence, the standard operating procedure
is to return those fluids to the upstream tankage. This
reduces the backwash discharge waste volume by 30%
to 50%, thereby reducing the size of the waste storage
and handling equipment. When the normalization cycle is
complete, all contaminants are removed and the media
bed is compressed. Filtration now is ready to resume. This
is done by opening valve “E” and closing valve “D.”
Valve Sequencing
A
B
INFLUENT
DRAIN
E
EFFLUENT
D
NORMALIZATION
BACKWASH OUTLET
C
Mode
A
Filtration
•
B
Filter Isolation
•
Fluidize #1
•
Discharge
•
Fluidize #2
•
Settle
•
Normalization
•
C
D
E
F
•
•
Media
Fluidization
Pump
Nominal Mode
Time
18-24 hrs
10 sec
•
On
10 sec
On
11 min (adjust)
On
10 sec
30 sec
•
3 min (adjust)
• Indicates valve is open; all other valves are closed.
valve “B” closes, and the fluidization pump is turned off,
allowing the media to sink by gravity. The delay lasts
approximately 30 seconds.
Step 4: Normalization The final step in regenerating the
filter bed is normalization. It is necessary to normalize
the filter to remove the dirty fluid and contaminants that
F
A
B
INFLUENT
DRAIN
E
D
EFFLUENT
NORMALIZATION
BACKWASH OUTLET
C
Data Sheet | TC9814-069
PROCESS & compression SYSTEMS
Less maintenance and less downtime
The WEMCO Silver Band system was designed to cost less
to maintain and incur less downtime than any other deepbed filters.
The result of this design focus is:
•B
ecause high volumes of backwash water are not required,
it provides the lowest filtration costs per gallon of clean
water available for this level of cleaning.
•B
ackwash offline time is as little as 14 minutes – the least
amount of time of any deep-bed filtration system.
• F ast, effective media regeneration performs positive
cleaning of media in an average of 14 minutes, with
upstream flow interruption of one to two minutes.
Designed for the oil field,
effective everywhere
The WEMCO Silver Band filter is designed for use in the
oil field. Its six operating valves (compared to almost a
dozen in most other filter systems) mean simpler operation,
lower costs and less maintenance. These factors give our
system an advantage over other bulk filters. In the case of
power interruptions that might be more likely in an oilfield
environment, the Silver Band filter recovers automatically,
even if caught in the regeneration cycle.
Although specifically designed for oilfield use, the system is
equally effective when used to treat and remove suspended
solids and oily residues from liquids such as those produced
by refinery and petrochem processes.
•C
leanup does not require removing media from the
vessel, which eliminates the need to tear down and clean
piping if power is lost during backwash.
• Filter performance lasts longer due to:
° The positive regeneration cycle that prevents bed
channeling and mudballing;
° Thorough media cleaning that maintains filtration
efficiency; and
° Regeneration volume that typically is less than 1% of
throughput, compared to 6% to 12% required of
other filters.
Unlike other media filters, Silver Band does not “force-set”
media after cleanup. Instead, our filters use a settling step
to allow gravity settling before pressurized flow resumes.
Force settling, common to many other filters, can damage
and plug the bottom screen. In contrast to other filters,
the Silver Band screen is cleaned during every regeneration
cycle before the media settle down.
Data Sheet | TC9814-069
PROCESS & compression SYSTEMS
Typical Onshore
Separation PFD
Compression
Gas
Export
Compression
METROL™
Three-Phase HP
Production Separator
METROL
Gas
Dehydration
METROL
Knock-Out
Drum
METROL
Three-Phase LP
Production Separator
Production
from Wells
PETRECO®
Electrostatic
Dehydrator
Krebs
Wellhead
Resander
WEMCO
Silver Bands
WEMCO
Pacesetter®
To
Solids
Treatment
VORTOIL™
SubSep
Downhole
Separator
Crude
Export
WEMCO
Depurator
Well
Fluid
Inlet
Booster
Produced Water
for Reinjection or
Disposal
Booster
Compression
Typical Compact Offshore
Separation PFD
Compression
Gas
Export
METROL
Two-Phase
Production
Separator
Production
from Wells
METROL
Knock-Out
Drum
Krebs
Wellhead
Resander
To
Solids
Treatment
METROL
Three-Phase
Production Separator
VORTOIL
PreSeparator
METROL
Gas
Dehydration
VORTOIL
Deoiler
PETRECO
Electrostatic
Dehydrator
WEMCO
Silver Bands
VORTOIL
Deoiler
VORTOIL
SubSep
Downhole
Separator
Crude
Export
WEMCO
ISF™ Single
Cell
Booster
Well
Fluid
Inlet
Typical Water
Injection PFD
Produced Water
for Reinjection or
Disposal
Recycle
BFCC
Anti-Biofouling
Unit
Chemical
Injection
Injection
Water
METROL
Deaerator
Tower
METROL
SEASCREEN™
Coarse
Filter
Seawater
Caisson
Lift Pump
and
Dosing Ring
METROL
Auto-Felt ™
or
Dual-Media
Fine
Filter
Injection
Pump
METROL
Polishing
Filter
METROL
SEACELL®
Booster
Pump
Data Sheet | TC9814-069
PROCESS & compression SYSTEMS
Specifications
Model No.
SB18
SB49
SB70
SB126
SB196
SB283
SB385
SB502
SB636
SB785
SB950
SB1130
SB1327
SB1539
Nom. Flow (b/d)
820
2300
3300
5800
9100
13,100
17,800
23,300
29,500
36,400
44,000
52,400
61,400
71,250
Nom. Flow (gpm)
25
65
95
170
265
380
520
680
860
1060
1285
1530
1790
2080
Nom. Flow (m /h)
6
15
22
39
60
86
118
154
195
241
292
347
407
472
Ship Wt. (lb)
2300
6500
7500
10,500
14,000
16,000
19,500
21,500
23,000
26,000
28,500
33,500
33,900
42,500
Operating Wt.
3200
9500
11,500
18,500
27,000
35,500
46,000
57,500
70,000
86,000
104,000
124,000
154,900
204,000
Process Inlet
1”
2”
2”
3”
3”
4”
6”
6”
6”
8”
8”
8”
8”
10”
Process Outlet
1”
2”
2”
3”
3”
4”
6”
6”
6”
8”
8”
8”
8”
10”
Backwash Disch.
1”
2”
2”
3”
3”
3”
4”
4”
4”
6”
6”
6”
6”
8”
Normalization
1”
2”
2”
3”
3”
3”
4”
4”
4”
6”
6”
6”
6”
8”
Vessel OD
1’ 6”
2’ 6”
3’
4’
5’
6’
7’
8’
9’
10’
11’
12’
13’
14’
Vessel S/S
8’
8’
8’
8’
8’
8’
8’
8’
8’
8’
8’
8’
8’
8’
Driver (hp)
3
7.5
10
15
20
25
30
40
50
60
75
100
150
100
2 x 3-10
3 x 4-10
4 x 6-10
4 x 6-10
4 x 6-12
6 x 8-12
6 x 8-12
3
Pump Size/Type
1-1/2 x 3-8 2 x 3-10
8 x 10-12 8 x 10-12 8 x 10-13 8 x 10-15 8 x 10-15
Dimensions
Model No.
SB18
SB49
SB70
SB126
SB196
SB283
SB385
SB502
SB636
SB785
SB950
SB1130
SB1327
SB1539
A
4’
7’
7’
8’ 8”
9’
9’ 10”
10’
11’ 8”
12’
15’
16’
18’
18’
18’
B
4’
7’
6’
7’
8’
9’ 10”
10’
10’
10’
12’
12’
12’
13’
14’
C
13’ 6”
14’ 8”
15’
15’ 6”
17’ 2”
18’ 4”
18’ 11”
19’ 4”
20’ 10”
23’ 8”
24’ 0”
24’ 10”
25’ 2”
26’ 6”
D
1’
1’
1’ 6”
1’ 6”
1’ 6”
1’ 6”
2’
2’
2’
2’
2’ 6”
2’ 10”
2’ 10”
2’ 10”
Dimensions shown are for preliminary planning only. Contact Cameron for exact dimensions at the time of purchase.
A
C
B
D
L O C AT I O N S
O t h er locat i o n s
United States of America
United Kingdom
Singapore
Abu Dhabi
Japan
11210 Equity Dr., Suite 100
Cameron House
2 Gul Circle (Gate 2)
Australia
Mexico
Houston, TX 77041
61-73 Staines Road West
Jurong, Singapore 629560
Brazil
Malaysia
USA
Sunbury-on-Thames
Tel +65.6861.3355
Calgary
Russia
Tel +713.849.7500
Middlesex, UK TW16 7AH
Colombia
Tel +44.1932.732000
Saudi Arabia
France
w w w. c - a - m . c o m
© 2011 Cameron | Pacesetter, PETRECO, SEACELL and WEMCO are registered trademarks of Cameron. Auto-Felt, ISF, METROL, SEASCREEN and VORTOIL are trademarks of Cameron. | Printed in USA | 08/11 TC9814-069