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Tubular Drag Conveyors

Technical Details: Conveyor Sizes & Speeds

The capacity chart below will allow you to roughly estimate the size of the conveyor and the speed based on the throughput requirements in cubic feet per minute (cubic liters/min) . The horizontal lines represent the velocity at which your product will pass through the conveyor. The vertical lines indicate the volumetric throughput rate in liters per minute. The diagonal lines are the sizes of the conveyors available.


How to Use the Capacity Chart

  • Based on your material's bulk density, calculate the required conveying rate in liters per minute. Locate the amount required on the horizontal scale.
  • Move up the vertical line and note where it intersects with one or more diagonal lines. Each intersection point indicates a possible conveyor size.
  • From each intersection point, move left horizontally all the way to the vertical scale, indicating the conveyor cable/chain speed.

There are many factors that enter into the tubular conveyor selection process. Beyond the mechanical selection described above, we consider the physical characteristics of the material to be conveyed and the equipment duty cycle.


Expected Standard CFM

Feet/Minute (Meters/Min) 3" (75mm) 4" (100 mm) 5" (125mm)
 60 (18)  2 (55)    4 (110)  6 (170)
120 (36) 4 (110)  7 (200) 12 (340)
180 (55) 6 (170) 11 (310) 17 (480)

Cableflow Tubular Drag Conveyors can operate up to 140 ft/min (43m/min) depending on material characteristics.

This drag conveyor capacity chart provides a general information based on conveyor sizes offered.

Tubular Drag Conveyor Selection Guidelines

  • The Cableflow conveyer can operate at speeds up to 140 ft/min (43m/min). The Chainflow conveyer can operate at speeds up to 100 ft/min (30m/min). The Dynaflow conveyer can operate at speeds up to 50 ft/min (15m/min).
  • It is generally advisable to apply a larger conveyor at a slower cable/chain speed if your material has sluggish flow characteristics, is sticky, abrasive or if the equipment operational duty cycle is extensive.
  • Smaller conveyor sizes and faster cable/chain speeds are usually selected when the material is free flowing and non-abrasive and/or the equipment duty cycle is low.
  • Future capacity requirements should be considered. It may be prudent to install a larger conveyor now, at a lower cable/chain speed, then increase the cable/chain speed later to accommodate a higher capacity. This can be done with the use of a variable frequency drive or gearing change.
  • Surges and uneven feed conditions should be considered. Surge hoppers may provide more constant feeding and may enable the use of a smaller conveyor.
  • Many forms of sludge do not flow well into or out of tubular conveyors. Dynaflow conveyors are recommended for applications involving sludge. It is generally advisable to oversize the conveyor by a factor of four or more and to never run the cable/chain at a speed above 20 ft/min. In all sludge applications, it is important to determine the characteristics of the sludge when it dries on the conveyor wall and cable or chain linkage. If it becomes too hard to be easily removed, another type of conveyor may be better suited.