PADDLE TYPE Concentric Bored Type - PC Eccentric Bored Type - PX Segmental Bored Type - PS Restriction Bored Type - PR UNIVERSAL Concentric Bored - Type - UC RING JOINT PLATE HOLDER Integral Plate Seal Type - PIRJ Hold Down Screw Type - PSRJ Snap Ring Clip Type - PCRJ HOLDING BLOCK ANSI 150 lb Flanges Type - HB WELD NECK Flange Taps RF Type - FWR Flange Taps RTJ Type - FWJ Corner Taps RF Type - FWC SLIP ON Flange Taps RF Type - FSR   These plates are used for most flow meter applications because they are so easy to reproduce, low cost, easy to install and remove and have very small error. Orifice plates are best used in clean non-viscous fluids and are generally used for Pipe Reynolds Numbers above 8000. Flow coefficient data for concentric bored orifices are available for flange taps, corner taps, pipe taps, vena contracta taps and radius taps. Concentric bored orifice plates that are used for two-way flow applications should be specified as for two-way flow. In this case, no bevel is placed on the orifice bore. Pipe Size 3/4" 1" 1 1/2" 2 " 2 1/2" 3" 4" 6" 8" O.D., inches 1.125 1.312 2.000 2.437 2.812 3.437 4.406 6.437 8.487 t, inches 1/8" 1/8" 1/8" 1/8" 1/8" 1/8" 1/8" 1/8" 1/8"   Pipe Size 10" 12" 14" 16" 18" 20" 24" 26" 30" O.D., inches 10.687 13.079 14.563 16.563 18.563 20.563 24.500 26.750 30.750 t, inches 1/4" 1/4" 1/4" 1/4" 1/4" 3/8" 3/8" 3/8" 1/2" *  Hastelloy C is a registered trademark of Delloro Stellite Co. **  Carp. 20 is a registered trademark of Carpenter Steel Co.