AWWA C207/C228 Spec Update: What Changed for 22″ Class-F Flanges
In 2023, The American Water Works Association (AWWA) has issued a specification revision affecting the bolt hole diameter for 22″ Class-F flanges. This revision is applicable to Carbon Steel (AWWA C207 Class F) and Stainless Steel (AWWA C228 Class SF) materials, in both Slip-On and Blind configurations. It means that engineers, procurement teams, and contractors […]
What Flange Quality Looks Like in the Real World
If you have worked around flanges long enough, you have seen it. Two different suppliers, two flanges made to the same specification, with the same dimensions, tolerances, material, and standard, and still do not look equal when they arrive. One shows up, and you feel confident it can be installed in piping systems. The other […]
API International’s General Flange Manufacturing Process
We start the process by receiving raw material.When material arrives, it first goes through receiving inspection. Our receiving inspector performs an initial check per the work order, measuring two points on the material to verify callout dimensions. This confirms that the raw stock matches the order and ensures machining feasibility before it enters production. At […]
The Most Common Flange Spec Mismatches (and How Standards Prevent Them)
The real issue behind most mismatches Most flange mismatches happen because people assume all flanges are the same. In reality, flanges from different manufacturers can vary in size, pressure rating, material, and bolt hole pattern.To avoid these problems, always double-check the basics before buying or installing a flange. Look at the size, pressure rating, material, […]
An Alternative Perspective: Why Flanges Exist and Their Purpose
1. The simplest way to explain what a flange is A flange is a lip. Try to grab a smooth pipe, and your fingers slide off. When you flare the end of the pipe, you create a small lip you can grab and pull. That lip is a flange.It’s the same idea as a strip […]