NSF has been testing and certifying drinking water system components for more than 70 years. The certification process is organized and follows a seven-step process that is applied across a wide range of products, including valves, flanges, and other piping
Connecting a weld neck flange to pipe requires a full-penetration butt weld, which provides the joint’s strength and structural integrity. Because the connection depends on weld quality, proper preparation, alignment, and procedure qualification are essential requirements. This guide explains the
On April 10, 2024, the EPA finalized its first National Primary Drinking Water Regulation for PFAS, establishing legally enforceable limits for six compounds in municipal water systems. NSF/ANSI/CAN 61 was updated the same year to match the EPA’s maximum contaminant
“Lead-free” is far more than a marketing phrase on a flange spec sheet – it is a strict requirement mandated by federal law. Any flange used in a drinking water system must meet this requirement, which is why certified flanges
An NSF certification mark can look like just another stamp on a spec sheet, but in reality, a rigorous, multi-step process stands behind it. Achieving true NSF certification requires independent chemical testing, a full manufacturing facility audit, and mandatory ongoing
Not every weld neck flange looks identical. The tapered hub and butt-weld end are constant, but the face type, hub length, and bore can all change to fit a specific joint or industry requirement. This guide covers the main types
The NSF-372 standard confirms one primary requirement: that a product qualifies as lead-free under federal law. Determining compliance requires more than checking whether a listed alloy contains lead. In this article, we cover what the NSF-372 standard measures, how the
A weld neck flange provides a strong, reliable piping connection, but only when designed to the correct material specification and dimensional standard. Choosing the wrong grade or class means the flange will either fail in service or fail to bolt
NSF/ANSI/CAN 60 and 61 were developed to create consistent standards for the materials, chemicals, and components used in drinking water systems. The history of NSF-60 and 61 reflects decades of work by regulators, standards organizations, utilities, and public health experts.
A weld neck flange starts as a solid steel billet and ends as a precisely machined component with a tapered hub and beveled weld end. The manufacturing process of weld neck flanges includes heating, forging, and machining steps. Those steps
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