What to do if the pump dead heads during Back-Vac operation
During the Back-Vac separation process, vacuum can start to build outside the bag due to a buildup of
removed solids on the sides of the bulk bag. The pump is designed to dead head at a vacuum between
-15 and -20 hg. If the pump dead heads during Back-Vac operation, follow the steps below:
1. Lift the suction nozzle assembly out of the water, but make sure to keep it over the catcher
tank to catch any discharge water.
2. Turn the ball valve handle to Cross-flow mode for 30 seconds to start the pump and drain
water from the cross-flow separator into the catcher tank.
3. Turn off the supply air valve.
4. Bleed any remaining vacuum from the holding chamber by loosening the two-inch poly-cap
and lifting slowly. Replace the cap once vacuum has been released.
5. Raise the VacBOX lid and examine the bulk bag—silt cakes should have fallen down into the
bag when vacuum was released. However, you may have to scrape the sides of the bag to
knock the silt cakes loose before you close the lid and resume Back-Vac operation.
© 2021 Flow International Corp.
Retrieved from Flow KB on April 14, 2021 PST
Ancillary option: Abrasive Transfer System (ATS)
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