One of the most frequent questions that pipe engineers and purchasing personnel encounter when designing a new project is slip on flange vs socket weld flange. In industrial piping systems, both types of flanges are prevalent, but they behave very differently under pressure, temperature, and load. The selection made could result in leaks, early failures or expensive rework later in the process.<\/p>\n
This guide explains how each flange is constructed, how they will work under real-world conditions and which flange type is right for your project per ASME B16.5 standards. If you are ordering flanges for a water treatment plant, chemical plant, or refinery, you’ll save time, money, and headaches later if you know the differences between them.<\/p>\n
A slip on flange slides directly over the pipe end and is secured with two fillet welds, one on the inside and one on the outside of the flange. The design makes alignment easier during installation, particularly when installing on extended runs of pipe where cutting is difficult.<\/p>\n\n
Slip-on flanges are popular because they are:<\/p>\n
Because the pipe doesn’t pass all the way through the flange bore, slip on flanges<\/a> have a lower pressure rating than weld neck flanges. Engineers do not usually use them when they are required for high-pressure or cyclic loading applications.<\/p>\n A socket weld flange has a machined socket that the pipe is inserted into, with a single fillet weld applied around the outside. Unlike a slip on flange, with a pipe, the bottom of the pipe rests against a shoulder inside the socket, creating a smoother flow path that reduces turbulence at the internal surface.<\/p>\n Key characteristics of a socket weld flange include:<\/p>\n Socket weld flanges are often used in instrumentation piping, small-diameter steam lines, and other low-flow-efficiency systems that require high pressure.<\/p>\nWhat Is a Socket Weld Flange?<\/h2>\n
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Slip On Flange vs Socket Weld Flange: Key Differences<\/h2>\n