Ash Screw Conveyor Design

I use screw conveyor for conveying ash from boiler.I manufactured it made by ASTM A36. The problems happened with this screw conveyor are abraded very fast.

All guys help me please??? Thanks....

I'm searching the books CEMA Handbook No 300 "Screw Conveyor Dimensional Standard" and CEMA Handbook No 350 "Screw Conveyor For Bulk Material". If guys have these books, please share with me. Thanks.....

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