AEC VacTrac Series Conveying Systems - Manual (Page 57)

VacTrac™ Series Conveying Systems Page 57
Mechanical Components WH2-605A.4
3-20 Installing and Adjusting the Take-off
Compartment
Take-off compartments (TOCs) are installed under surge bins,
silos, or other storage devices. TOCs are available in a single
position complete cleanout style with a V-shaped bottom or a box
type with one or more material takeoff positions.
You can have several different size tubes for several different sized
pump packages conveying a material from a central supply to
several destinations.
Take-off compartments are typically pre-drilled for mounting and
their outlets are sized to fit the pump package, material, and
distance specified at the time of purchase.
; Make sure that a three-foot (1 m) horizontal run is present prior
to installing elbows.
; Install the TOC so the outlet tubes can head out unobstructed in
the direction of the material destination.
; Use long radius bends on TOC outlets.
; Provide access for removing and cleaning TOC inlet air filters.
; Provide access for cleanout doors on TOCs.
Most TOCs have adjustable material inlet tubes to fine-tune the
material to air ratio for optimal conveying rates. To adjust:
1. Loosen the set screw on the adjusting dial and turn the tube
clockwise one third of the way from the
0 (zero) mark.
2. Turn ON the VacTrac system and start loading from the
takeoff.
3. Rotate the dial until the material flows at a steady rate, then
throttle it back a bit when surging or flooding occurs. System
vacuum should be between 8” Hg (271 millibars) to 12” Hg
(339 millibars) for best rates.
4. Lock the dial in place with the set screw when you have
determined the best setting for a particular material. Make
note of the setting and vacuum level for future reference.