[an error occurred while processing this directive] D I S C   F I L T R A T I O N
SPIN DISC
SPIN DISC TECHNOLOGY
Operations
Backwash
SPIN DISC PRODUCTS
2" Compact Stand-alone
2" Standard
3" Standard
3" Star System
4" Galaxy System

The Most Efficient Self-cleaning Filtration
A2 offers the reliable Arkal Disc Filtration System for filtering industrial process and wastewater. It is one of the most efficient filtration systems available. The Spin Disc system operates using a specially designed disc filtration technology. Thin, color-coded polypropylene discs are diagonally grooved on both sides to a specific micron size. A series of these discs are then stacked and compressed on a specially designed spine. When stacked, the groove on top runs opposite to the groove below, creating a filtration element with a statistically significant series of valleys and traps for solids. The stack is enclosed in a corrosion and pressure resistant housing.

Spin Disc Features:
  •  Low Backwash Volumes
  •  Continuous supply of filtrate during backwash
  •  Elements do not need replacing
  •  A simple element change for filtration grade adjustments
  •  Modular units fit any space and can expand or retract easily
  •  10 to 400 micron filtration size
  •  Small Footprint

  • SPIN DISC TECHNOLOGY

    OPERATION
    The Spin Disc compressed disc stack retains particles while clean filtrate passes. Once the element is loaded with particles, the backwash cycle initiates automatically. First, the reversal of the water flow decompresses the disc stack allowing the discs to move freely. Then, a series of nozzles spray a mixture of high pressure water and air on the disc grooves, causing them to spin rapidly. The combination of the spray and spinning action cleans the discs very quickly.

    Normal Filtration



    Click on image for animation    
    During normal filtration the discs are tightly compressed together by the spring's power and the differential pressure, thus providing high filtration efficiency.

    Filtration occurs while water is percolating from the outer diameter to the inner diameter of the element.

    Depending on the micron rating, there are from 18 (in 400 micron discs) to 32 (in 20 micron discs) stopping points in each track, thus creating the unique in-depth filtration.

    Backwashing Filtration


    Activated by a control signal, alternate units of the Spin Disc system go into backwash operation. The inlet valve is shut as the drain is automatically opened.

    During backwash, the compression spring is released. The spin piston rises up, releasing the pressure on the discs.

    , Tangential jets of clean water are pumped at high pressure in the opposite direction through nozzles at the center of the spine. The discs spin free and clear, loosening the trapped solids. Solids are quickly and efficiently flushed out through the drain.

       Click on image for animation

    BACKWASH TYPES:


    Standard Source Standard source backwash uses filtrate from the other filter "pods" on the filter battery as the water source to backwash each "pod". In the standard source backwash process, one pod in the filter battery is isolated from the inlet water via a three-way valve. This same three-way valve is opened to a drain manifold through which the backwash water will leave the backwashed filter pod. A portion of the filtrate from the other pods in the filter battery is then diverted back through the pod being backwashed. The backwash flow is in the opposite direction of the flow when the pod is filtering water, so that the filter is backwashed clean. The dirty backwash water leaves the pod and flows out through the three-way valve into the drain manifold where it is discharged from the system. Once the first pod is backwashed, it is brought back "on line" by changing the three-way valve back to the inlet manifold and then isolating the next pod on the filter battery for backwashing. In this way the complete filter system is backwashed - one pod at a time - so that even during backwash the filter system is still filtering water.

    Benefits:
  • Low cost.
  • Backwash is fast and efficient
  • No need for external source of water
  • Easy maintenance

    Limitations:
  • Inlet feed water pressure must be consistently above 70 psi for fine discs, or 60 psi for coarse disc filtration.

  • External Source External source backwash uses an external source of clean water (potable water, fire water, stored filtrate, etc.) as the water source to backwash each "pod". In the external source backwash, one pod in the filter battery is isolated from the inlet water via a three-way valve. This same three-way valve is opened to a drain manifold through which the backwash water will leave the filter pod. At the same time, the pod is isolated from the outlet manifold via another three way valve. This three way valve is opened to an "external source" manifold. When the external source manifold is opened, backwash water from the external source is forced back through the pod being backwashed. The backwash flow is in the opposite direction of the flow when the pod is filtering water, so that the filter is backwashed clean. The dirty backwash water flows out through the three-way valve into the drain manifold where it is discharged from the system. Once the first pod is backwashed, it is brought back "on line" by changing both three-way valves back to the inlet and outlet manifolds and then isolating the next pod on the filter battery for backwashing. In this way the complete filter system is backwashed - one pod at a time - so that even during backwash the filter system is still filtering water.

    Benefits:
  • Can use any clean water source
  • Feedwater pressure and flow can vary without impacting backwash process
  • Pressure can be controlled to ensure proper backwash water pressure
  • Easy maintenance

    Limitations:
  • Slightly more expensive than the "Standard Source" backwash technique.
  • Must have pressurized backwash water system.

  • Air Assist Air assisted backwash uses a stored volume of filtrate as the backwash water source to backwash each "pod". In the air assisted backwash, the valve configuration is the same as the external source backwash technique: one pod in the filter battery is isolated from the inlet water via a three-way valve. This same three-way valve is opened to a drain manifold through which the backwash water will leave the filter pod. At the same time, the pod is isolated from the outlet manifold via another three way valve. This three way valve is opened to an "external source" manifold.

    During filtration, a volume of filtrate is stored in an "on-board" storage reservoir. This stored volume of filtrate is the water that will be used for backwashing each pod. When a backwash is initiated, the external source manifold is opened and backwash water from the filtrate reservoir is forced back through the pod being backwashed using compressed air. The compressed air is connected to the filtrate reservoir via a two-way valve that opens when the backwash process is initiated to force the water back into the filter battery. The backwash flow is in the opposite direction of the flow when the pod is filtering water, so that the filter is backwashed clean. The dirty backwash water flows out through the three-way valve into the drain manifold where it is discharged from the system. Once the first pod is backwashed, it is brought back "on line" by changing both three-way valves back to the inlet and outlet manifolds. After the first pod is backwashed, the filter delays initiating the second pod for a few seconds to allow the reservoir pod to refill with clean filtrate water. Once the reservoir is filled, the next pod on the filter battery is isolated for backwashing. In this way the complete filter system is backwashed - one pod at a time - so that even during backwash the filter system is still filtering water.

    Benefits:
  • The absolute lowest backwash water volume requirement of any filtration system
  • Feedwater pressure and flow can vary without impacting backwash process
  • Pressure is controlled using compressed air to ensure proper backwash water pressure
  • Air/water mixture creates an extremely aggressive backwash for superior cleaning
  • Easy maintenance

    Limitations:
  • Slightly more expensive than the "External Source" backwash technique.
  • Must have compressed air at 80 psi at approximately 24 cfm (used for approximately 5 seconds per pod).
  • Footprint is the same but the system is slightly taller

  • SPIN DISC PRODUCTS

    2" Spin Disc Compact Stand-alone Unit


    Size: 2"

    Capacity: Small Flow (35-90 gpm)

    Operation: Fully Automatic Disc Filtration Unit

    Material: Polyester Coated

    Backwash types available for this unit include:
    Standard Source, External Source, and Air Assist

    CLICK HERE OR SCROLL DOWN FOR HEAD LOSS CHARTS

    2" SPIN DISC COMPACT (STAND ALONE)
      Max. pressure 147 psi
      Max. Temperature 60 deg. C
      Filtration surface area 1.0 ft2
      Filtration volume 75.1 in3
      Filter length - L 2.0 ft
      Filter width - W 2.3 ft
      Distance between end connections A. 2.0
    B. 7.6
     ft
     in
      Weight 63 lbs

    2" Spin Disc Standard Unit


    Size: 3" - 6" inlet/outlet diameter

    Capacity: Low flow (45-530 gpm)

    Operation: Modular, Fully Automatic Disc Filtration System

    Material: Polyester Coated or Stainless Steel

    Backwash types available for this unit include:
    Standard Source, External Source, and Air Assist

    CLICK HERE OR SCROLL DOWN FOR HEAD LOSS CHARTS

    2" SPIN DISC STANDARD
    POLYESTER COATED CARBON STEEL OR SILVER-LINE (STAINLESS ST.)
         2 units  3 units  4 units
      Max. pressure  147 psi  147 psi  147 psi
      Max. temperature  60 C  60 C  60 C
      Filtration surface area  2.0 ft2  3.0 ft2  4.1 ft2
      Filtration volume  150.1 in3  225.2 in3  300.2 in3
      Battery length
      (please add 1.2 ft for air assist)
     2.0 ft  3.0 ft  4.0 ft
      Battery height  3.8 ft  3.8 ft  3.8 ft
      Battery width  2.7 ft  2.7 ft  2.7 ft
      Weight (polyester coated)  174 lbs  221 lbs  267 lbs
      Weight (stainless steel)  154 lbs  198 lbs  243 lbs
      Standard Manifold  3 in  3 in  3 in

    2" SPIN DISC STANDARD
    POLYESTER COATED CARBON STEEL OR SILVER-LINE (STAINLESS ST.)
         5 units  6 units  7 units  8 units
      Max. pressure  147 psi  147 psi  147 psi  147 psi
      Max. temperature  60 C  60 C  60 C  60 C
      Filtration surface area  5.1 ft2  6.2 ft2  7.2 ft2  8.3 ft2
      Filtration volume  375.3 in3  450.4 in3  525.5 in3  600.6 in3
      Battery length
      (please add 1.2 ft for air assist)
     5.0 ft  6.0 ft  7.0 ft  8.0 ft
      Battery height  3.8 ft  3.8 ft  3.8 ft  3.8 ft
      Battery width  2.7 ft  2.7 ft  2.7 ft  2.7 ft
      Weight (polyester coated)  320 lbs  371 lbs  422 lbs  470 lbs
      Weight (stainless steel)  289 lbs  334 lbs  380 lbs  425 lbs
      Standard Manifold  4 in  4 in  4 in  4 in

    Head Loss Chart
    2" Spin Disc - In Clean State


    1 - Blue(400 MICRON / 40 MESH)
    2 - Yellow        (200 MICRON / 80 MESH)
    3 - RED(130 MICRON / 120 MESH)
    4 - BLACK(100 MICRON / 140 MESH)
    5 - GREEN(55 MICRON)
    6 - GREY(20 MICRON)



    3" Spin Disc Standard Unit


    Size: 4" - 10" inlet/outlet diameter

    Capacity: Medium flow (400-880 gpm)

    Operation: Modular, Fully Automatic Disc Filtration System

    Material: Polyester Coated or Stainless Steel

    Backwash types available for this unit include:
    Standard Source and External Source

    CLICK HERE OR SCROLL DOWN FOR HEAD LOSS CHARTS

    3" SPIN DISC STANDARD
    POLYESTER COATED CARBON STEEL OR SILVER-LINE (STAINLESS ST.)
         2 units  3 units  4 units
      Max. pressure  147 psi  147 psi  147 psi
      Max. temperature  60 C  60 C  60 C
      Filtration surface area  4.0 ft2  6.1 ft2  8.1 ft2
      Filtration volume  299 in3  448.5 in3  604.1 in3
      Battery length  2.0 ft  3.0 ft  4.0 ft
      Battery height
      (add 1.1 ft for air assist)
     4.0 ft  4.0 ft  4.0 ft
      Battery width  3.0 ft  3.0 ft  3.0 ft
      Weight (polyester coated)
      (add 55 lbs for AA)
     220 lbs  353 lbs  408 lbs
      Weight (stainless steel)
      (Add 54 lbs for AA)
     208 lbs  331 lbs  375 lbs
      Standard Manifold  4 in  4 in  4 in

    3" SPIN DISC STANDARD
    POLYESTER COATED CARBON STEEL OR SILVER-LINE (STAINLESS ST.)
         5 units  6 units  7 units  8 units
      Max. pressure  147 psi  147 psi  147 psi  147 psi
      Max. temperature  60 C  60 C  60 C  60 C
      Filtration surface area  10.2 ft2  12.2 ft2  14.3 ft2  16.3 ft2
      Filtration volume  747.5 in3  897 in3  1046.5 in3  1196 in3
      Battery length  5.0 ft  6.0 ft  7.0 ft  8.0 ft
      Battery height
      (add 1.1 ft for air assist)
     4.0 ft  4.0 ft  4.0 ft  4.0 ft
      Battery width  3.0 ft  3.0 ft  3.0 ft  3.0 ft
      Weight (polyester coated)
      (add 55 lbs for AA)
     492 lbs  610 lbs  740 lbs  870 lbs
      Weight (stainless steel)
      (Add 54 lbs for AA)
     441 lbs  543 lbs  659 lbs  770 lbs
      Standard Manifold  6 in  6 in  8 in  8 in

    3" Spin Disc Star Unit


    Size: 3" Spin Disc compact batteries
    8" - 12" inlet/outlet diameter

    Capacity: High flow (880-2,600 gpm)

    Operation: Modular, Fully Automatic Disc Filtration System

    Material: Polyester Coated or Stainless Steel

    Backwash types available for this unit include:
    Standard Source and External Source

    CLICK HERE OR SCROLL DOWN FOR HEAD LOSS CHARTS

    3" SPIN DISC - STAR SYSTEM
    POLYESTER COATED CARBON STEEL
        8 units 12 units 15 units 18 units
      Max. pressure 147 psi 147 psi 147 psi 147 psi
      Min. pressure backflushing 51 psi 51 psi 51 psi 51 psi
      Vol. Of water for each backflush 139 gal 209 gal 260 gal 312 gal
      Filtration surface area 16.1 ft2 24.2 ft2 30.4 ft2 36.4 ft2
      Filtration volume 1196 in3 1794 in3 2243 in3 2691 in3
      Battery length 4.2 ft 4.2 ft 5.8 ft 5.8 ft
      Battery height 5.4 ft 6.9 ft 6.9 ft 7.1 ft
      Battery width 3.7 ft 3.7 ft 6.5 ft 6.5 ft
      Distance between inlet/outlet (flange) 4.1 ft 4.1 ft 5.7 ft 5.7 ft
      Flange diameter 8"  10"  10"  12" 
      Weight 1102 lbs 1345 lbs 1654 lbs 1984 lbs

    3" SPIN DISC - STAR SYSTEM
    STAINLESS STEEL
        8 units 12 units 15 units 18 units
      Max. pressure 147 psi 147 psi 147 psi 147 psi
      Min. pressure backflushing 51 psi 51 psi 51 psi 51 psi
      Vol. Of water for each backflush 139 gal 209 gal 260 gal 312 gal
      Filtration surface area 16.1 ft2 24.2 ft2 30.4 ft2 36.4 ft2
      Filtration volume 1196 in3 1794 in3 2243 in3 2691 in3
      Battery length 4.2 ft 4.2 ft 5.8 ft 5.8 ft
      Battery height 5.4 ft 6.9 ft 6.9 ft 7.1 ft
      Battery width 3.7 ft 3.7 ft 6.5 ft 6.5 ft
      Distance between inlet/outlet (victualic) 2.5 ft 2.8 ft 3.7 ft 3.9 ft
      Diameter (victualic) 8"  10"  10"  12" 
      Weight 926 lbs 1124 lbs 1389 lbs 1587 lbs

    Head Loss Chart
    3" Spin Disc - In Clean State


    1 - Blue(400 MICRON / 40 MESH)
    2 - Yellow        (200 MICRON / 80 MESH)
    3 - RED(130 MICRON / 120 MESH)
    4 - BLACK(100 MICRON / 140 MESH)
    5 - GREEN(55 MICRON)
    6 - GREY(20 MICRON)



    4" Spin Disc Galaxy Unit


    Size: 4" - 10" inlet/outlet diameter

    Capacity: Medium flow (400-880 gpm)

    Operation: Modular, Fully Automatic Disc Filtration System

    Material: Polyester Coated or Stainless Steel

    Backwash types available for this unit include:
    Standard Source and External Source

    CLICK HERE OR SCROLL DOWN FOR HEAD LOSS CHARTS

    4" SPIN DISC-GALAXY SYSTEM
    MANIFOLDS - STAINLESS STEEL, GALVANIZED OR POLYESTER COATED CARBON STEEL
         3 units  4 units  5 units  6 units  7 units
      Max. pressure  146 psi  146 psi  146 psi  146 psi  146 psi
      Max. temperature  60 C  60 C  60 C  60 C  60 C
      Filtration surface area  2046 in2  2728 in2  3410 in2  4092 in2  4774 in2
      Filtration volume  1208 in3  1611 in3  2014 in3  2417 in3  2819 in3
      Battery length  57 in  62 in  73 in  73 in  107 in
      Battery height  60 in  60 in  60 in  60 in  60 in
      Battery width  33 in  65 in  65 in  65 in  65 in
      Weight  500 lbs  600 lbs  750 lbs  900 lbs  1150 lbs
      Standard Manifold  4 in  6 in  6 in  6 in  8 in

    4" SPIN DISC-GALAXY SYSTEM
    MANIFOLDS - STAINLESS STEEL, GALVANIZED OR POLYESTER COATED CARBON STEEL
         8 units  9 units  10 units  11 units  12 units
      Max. pressure  146 psi  146 psi  146 psi  146 psi  146 psi
      Max. temperature  60 C  60 C  60 C  60 C  60 C
      Filtration surface area  5456 in2  6138 in2  6820 in2  7502 in2  8184 in2
      Filtration volume  3222 in3  3624 in3  4028 in3  4430 in3  4833 in3
      Battery length  107 in  130 in  130 in  153 in  153 in
      Battery height  60 in  60 in  60 in  60 in  60 in
      Battery width  65 in  65 in  65 in  65 in  65 in
      Weight  1300 lbs  1500 lbs  1650 lbs  1850 lbs  2000 lbs
      Standard Manifold  8 in  10 in  10 in  12 in  12 in

    Head Loss Chart
    4" Spin Disc - In Clean State






    [an error occurred while processing this directive]