Screw Conveying In Low Gravity

Hello,

What kind of effects does gravity have on screw conveying horsepower calculations and design considerations? Upon looking through the ANSI-CEMA-350 standard for screw conveyors for bulk material I cannot find the effects of gravity on the various calculations?

Any help would be greatly appreciated!

Thank you.

My guess is that those standards have not yet been updated to include screw conveyors on the moon. :)