In this case, the ASME B16.9 ASTM B366 UNS31254 concentric reducer has a reduction from 1-1/2 inches to 1/2 inch, with a schedule of SCH160. This means that the larger end of the reducer has an outside diameter of approximately 1.9 inches and a wall thickness of approximately 0.5 inches, while the smaller end has an outside diameter of approximately 0.84 inches and a wall thickness of approximately 0.16 inches.

The use of UNS31254 in this fitting suggests that it is intended for use in high-corrosion environments, such as in the chemical, petrochemical, and oil and gas industries.

ASME B16.9 is a standard that covers the dimensions and tolerances of factory-made wrought butt-welding fittings. ASTM B366 is a standard specification for factory-made wrought nickel and nickel alloy fittings. UNS31254 is a specific type of nickel alloy that conforms to ASTM B366.

A concentric reducer is a type of pipe fitting that is used to connect pipes of different sizes. It is called "concentric" because the centerline of the reduction section is in the same axis as the centerline of the larger and smaller pipes.

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