FAMILY OWNED AND OPERATED SINCE 1951

STACK SIZER® 

The Derrick® Stack Sizer® redefines fine particle wet screening, offering high capacity and exceptional efficiency in minimal space. Consisting of up to five individual screen decks positioned one above the other and operating in parallel, the Stack Sizer provides a unique combination of high capacity and efficiency that sets the Stack Sizer far above the nearest competition. Operators worldwide are using the Stack Sizer in a wide variety of applications and capitalizing on the numerous benefits of these remarkable machines to earn significant returns.

  • Screen Decks
  • Derrick Integrated Vibratory Motors
  • Polyweb Urethane Screen Panels
  • Flo-Divider™
  • Feeders
  • Repulp Spray System (Optional)
  • Multifeed Retrofit Kit

Principle of Operation

The patented Derrick Stack Sizer consists of up to five individual screen decks positioned one above the other and operating in parallel. A custom-engineered single or multiple stage Flo-Divider system representatively splits the feed slurry to each Stack Sizer and then to the decks on each machine. Ample space is provided between each of the screen decks for easy observation during operation and easy access for maintenance and replacement of screen surfaces. Each screen deck has an undersize collection pan which discharges to a launder with a single outlet. Similarly, the oversize from each of the screen decks collects in a single hopper with a common outlet

Multifeed Retrofit Kit

A 3-deck Stack Sizer drop-in replacement is now available for current users of Derrick Multifeed Screens. With up to two times the capacity, the Stack Sizer Multifeed retrofit has a similar footprint and is designed with the same oversize and undersize discharge points, eliminating the need for any piping or launder changes. If your machine has reached the end of its useful life, this is the perfect upgrade and will allow you to take advantage of all the features and benefits of Stack Sizer technology with minimal installation costs. Older Multifeed installations typically used woven wire Sandwich Screen® panels. Stack Sizers achieve more efficient separations using Derrick Polyweb panels with openings as fine as 45 microns. The characteristic long life of Polyweb surface technology also lowers operating costs. Finally, with respect to health and safety, sound levels produced by Stack Sizers are much lower than the older Multifeed machines.

FEATURES & BENEFITS

  • Up to five decks stacked one above the other operate in parallel, giving high capacity in minimal space
  • Easy access for maintenance, servicing, and replacement of screen panels
  • Simple drawbolt tensioning system permits all panels to be changed on a five-deck machine in about 30 to 40 minutes
  • Urethane screen frame coating provides abrasion resistance
  • Low sound production
  • Dual 2.5 HP (1.9 kW) Super G® vibratory motors are standard on the Stack Sizer providing uniform linear motion over the entire screen width and length of all screen decks
  • Super G motors offer maintenance-free, greased-forlife bearings (Two-year warranty)
  • Optional Super G2® vibratory motors offers a continuous recirculating internal oil lubrication system (Three-year warranty)
  • Up to 45 percent open area for maximum flow  capacity
  • Full range of openings down to 325 mesh (45 μm) permits screening from coarse to super fine particles
  • Unique non-blinding design for optimum efficiency and performance
  • Long Lasting – 6 to 12 months is common
  • Equalizes feed flow from source to each deck for optimal separation efficiency
  • Custom-designed to meet process and layout requirements
  • Available in wide range of discharge outlets from 2-way to 15-way
  • Equipped with dart valves to stop the flow to one or more outlets
  • Optional low profile inline Flo-Divider is available to accommodate height restrictions
  • Urethane pockets built into the feeder create a uniform distribution of feed slurry across the entire width of the screen
  • Easily removed front cover facilitates maintenance and debris removal
  • Inlet pipe configurations custom designed, if needed, to meet equipment layout requirements
  • Rubber-lined for long life
  • Increase screening efficiency without increasing deck length
  • Spray bars designed to dispense water into repulp wash troughs
  • Added free water helps undersize material pass through screen panels
  • Replaceable rubber repulp wash troughs
  • Up to twice the capacity in the same footprint
  • More efficient separations and lower operating costs with Polyweb urethane surfaces
  • Dual vibrator linear motion provides improved oversize conveyance
  • Significantly reduced sound levels

RELATED DOCUMENTS

Please note: Information on this website is subject to change. To obtain accurate dimensions and equipment configurations, please contact the Derrick Engineering Department for an updated GA drawing.

Stack Sizer

Please note: Information on this website is subject to change. To obtain accurate dimensions and equipment configurations, please contact the Derrick Engineering Department for an updated GA drawing.

Case Study 200 – Stack Sizers In Grinding Circuit Increase Capacity and Metal Recovery at Lead & Zinc Operation

Case Study 202 – Two Stack Sizers Produces 33 Short Tons/Hour of Clean Coal Using 150 Micron Polyweb Screens

Case Study 203 – Stack Sizer Improves Jianshan Operation at TISCO

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