General Specifications for NRG COMPANY, INCORPORATED Chain and Flight Skimmer Equipment Part 2 - Products 2.10 Scum Beach   Scum Beach shall be located beneath the head shaft and shall be curved to match the articulation of the flight around the head shaft sprocket. The far side of the scum beach shall be a trough designed for either natural run off of the scum or transmission via a screw conveyor. Beach shall be fully adjustable for proper fitting in the field and shall be stainless steel.