Introduction
In medium-low pressure piping systems, reducers (also called eccentric or concentric reducers) are critical components that connect pipes of different diameters while maintaining flow efficiency and reducing turbulence. For engineering, procurement, and construction (EPC) projects, sourcing custom reducers often becomes necessary when standard sizes or materials do not meet specific design conditions. This article provides a procurement-focused guide for engineers and industrial buyers, covering essential standards, required inspection documents, an RFQ checklist, and common quality risks to ensure a reliable supply chain.
Key Standards for Reducers
When specifying reducers, always confirm the applicable standards. For butt-weld reducers used in medium-low pressure piping, the most common standard is ASME B16.9 – Factory-Made Wrought Buttwelding Fittings. This standard covers dimensions, tolerances, and marking requirements. For flanged reducers, ASME B16.5 (Pipe Flanges and Flanged Fittings) applies, though reducers are typically buttweld or socket-weld type.
