How NSF/ANSI/CAN 61 Aligns With U.S. EPA PFAS Regulations
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 levels. In this guide, we cover what changed in the 2024 standard, how the new […]
Why the Safe Drinking Water Act Requires Lead-Free Flanges
“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 carry the NSF/ANSI/CAN 372 mark. In this article, we eplain the origins of the regulation, […]
How NSF Certification Is Earned
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 checks over time (not a one-time review). Understanding this complete process is essential when specifying […]
Types and Applications of Weld Neck Flanges
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 of weld neck flanges and the industries where they are the preferred choice. Weld Neck […]
NSF 372 Certification: Technical Requirements and Testing
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 weighted-average lead calculation works, and which products fall under the standard. What Is NSF/ANSI/CAN 372? […]
Weld Neck Flange Materials and Standards
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 up altogether. This guide covers the ASTM material grades used in weld neck flange manufacturing […]
A Brief History of NSF/ANSI/CAN 60 and 61
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. The goal was to establish clearer requirements for drinking water safety. In this guide, we […]
How Are Weld Neck Flanges Made?
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 determine the flange’s grain structure and dimensional accuracy. In this guide, we cover the manufacturing […]
What Is NSF/ANSI/CAN 61? A Guide to Certified Drinking Water Flanges
If a flange is installed in a North American drinking water system, the spec sheet is almost certain to reference NSF®/ANSI/CAN 61 before any other standard. NSF/ANSI/CAN 61 determines whether a flange, gasket, or coating is permitted to contact potable water at all. This guide covers what the standard actually regulates, where it originated, what […]
What Is NSF/ANSI/CAN 372? Lead-Free Requirements for Certified Flanges
NSF-61 and NSF/ANSI/CAN 372 are two consistently paired standards which are often called “NSF-61/372” and treated as one certification. strict limits on lead content leaching in drinking water systems. This standard has its own legal basis and its own testing methodology. This guide covers what exactly this standard verifies, where its lead content threshold comes […]