Reline Scrolls
Pneumatic conveyance fans endure a huge amount of wear. Not only the blast wheels, but the scrolls (they house the blast wheel) will wear out due to the abrasion they endure.
If the damage is not too great, you can repair instead of replace.
One of the most popular repairs is to replace or line the scroll with abrasive resistant steel.
We use ¼-inch as well as ½-inch abrasive resistant steel for our liners.