Johnson screen scallops custom design We custom design Johnson wedge wire screen scallops for reactor internals. Custom Design Considerations: Material Selection, Slot Size, and Flow Rate Optimization. Johnson screen scallops(wedge wire scallops) are reactor internals made from stainless steel vee wires. They are shaped and welded into a grid or https://www.ubowedgewire.com/About/johnson-screen-scallops-custom-design-2275-1.htm