Socket Weld Flanges

Socket Weld flanges are designed to accept a pipe into a socket, then welded between flange hub and pipe OD. Sometimes referred to as Counter Bore flanges, Socket Weld flanges were originally developed for use on small, high pressure piping systems. Today, they’re widely used in applications where spatial limitations exist.

According to ASME B31.1, a Socket Weld flange weld is properly executed by first inserting the pipe into the socket of the flange until it reaches the bottom, then separating the pipe end from the flange by 1.6mm before welding. The gap is there to allow proper positioning of the pipe inside the flange socket after the solidification of the weld.

Socket Weld Flanges are best suited for smaller NPS, high-pressure piping systems that do not transfer highly corrosive fluids due to the fact that they’re subject to corrosion in the gap between the end of the pipe and the shoulder of the socket.

Socket Weld Flanges are similar to Slip On flanges. However, where Slip On flanges do not have a Schedule that corresponds to the pipe, Socket Welds flanges do. This is because the internal recess, or socket that the pipe end fits into, has a groove that is the same width as the pipe being welded to it. The pipe should be square cut for best results, allowing for a smoother flow of the process fluid. Socket Weld flanges will be slightly more expensive than Slip-On flanges due to the more intricate machining required to manufacture them.

James Duva, Inc. offers Socket Weld flanges in stainless, nickel alloy and low temp grades. Our team of experts will help you procure the best materials for your project. We are dedicated to being the industry leader in customer service, ensuring a job done right with the best products to suit your specific needs.