Abstract: A concrete pad with drainage holes is created using an in-situ form with a plurality of spaced, vertically aligned conduits having upper ends with removable caps and spacers connecting the conduits. The form is horizontally positioned at the area where the pad is to be created and concrete is poured into the form until the upper surface of the concrete is in a plane with the upper ends of the conduits. After the concrete has cured, the caps are removed to permit water to flow from the top of the pad through the conduits for drainage into the soil beneath the pad.

Abstract: A pre-screening element for use with pneumatic discharge systems for transport of powdered material has a housing having an inlet and an outlet, a first vane array, having a plurality of strip-shaped first vanes arranged inside the housing and spaced apart with respect to a longitudinal axis of the housing, each individual vane of the plurality of first vanes being substantially parallel to other vanes of the first vane array and having a long edge facing the inlet, and a second vane array, having a plurality of strip-shaped second vanes arranged inside the housing each individual vane of the plurality of second vanes being substantially parallel to other vanes of the second vane array and having a long edge facing the inlet, a longitudinal axis of the first vanes being arranged at an angle to a longitudinal axis of the second vanes.

Abstract: A pre-screening element for use with pneumatic discharge systems for transport of powdered material has a housing having an inlet and an outlet, a first vane array, having a plurality of strip-shaped first vanes arranged inside the housing and spaced apart with respect to a longitudinal axis of the housing, each individual vane of the plurality of first vanes being substantially parallel to other vanes of the first vane array and having a long edge facing the inlet, and a second vane array, having a plurality of strip-shaped second vanes arranged inside the housing and spaced apart with respect to a longitudinal axis of the housing, each individual vane of the plurality of second vanes being substantially parallel to other vanes of the second vane array and having a long edge facing the inlet, a longitudinal axis of the first vanes being arranged at an angle to a longitudinal axis of the second vanes.