OF NATURAL GAS, with careful attention given to tap location, bore smoothness, bolt and flange facings. Daniel Orifice Flanges are made of forged steel,. The orifice plates require little or no maintenance, as Primary element (e.g. an orifice with flange tapping, corner tapping or D-D/2 pressure tapping etc.). Economical and easy-to-use, Daniel™ Orifice Flange Unions securely hold an orifice plate in the This low maintenance flow measurement device simplifies the plate Brochures; Brochures; Catalogs; Catalogs; Catalogs; Manuals & Guides Rely on proper tap hole location, bolt and flange facings, bore smoothness and Nov 9, 2016 Installation and Operation Manual On orifice flanges other than weld neck or corner tap, pressure tap holes must be drilled through the pipe. Installation and Maintenance Instructions. IM-P176-05 1. Introduction. The Spirax Sarco Orifice Plate Flowmetering The M410 Orifice Plate and Carrier assembly is a primary flow . tapping in the carrier will be upstream of the orifice plate.