Imperial orifice plates are monufactured to the recommendations of AGA, ISA, ASME, and ISO. Normally supplied in 304 or 316 stainless steel, Monel, Hastelloy C or B, Alloy 20, Teflon and other materials available. Supplied in all standard designs - Concentric, Eccentric, Quadrant Edge, Bore with Counter Bore, Segmental. Sized to the correct bore by our engineering department on our computer system for fast calculations with accuracy. Grounding rings and spacers available to custoner specifications. Orifice flange unions standard carbon steel stainless steel and other forgeable materials available. Calculations can be done in either metric or english units.