Slip-On Flanges

A Slip On flange is designed to accept a pipe into its bore, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. A second weld is generally made between the pipe OD and flange hub. For tips on how to properly weld a Slip-On flange, visit the American Welding Society at aws.org.

Although their strength under pressure and life under fatigue are less than that of their Weld Neck counterpart, Slip On flanges are often chosen due to their lower cost and ease of installation. Generally, these flanges are much easier to align to a pipe end, with the pipe cut requiring less accuracy in length and squaring, in turn saving time on preparation and installation. However, because Slip-On flanges have a calculated strength under internal pressure of approximately 65% of a Weld Neck flange of the same class and grade, Slip-On flanges are limited to line sizes of 1/2″ to 2-½” in the Class 1500 ANSI standard.

Slip On pipe flanges are typically manufactured and supplied with a raised face, and often with a flat face. The standard height of the raised face is 1/16″ for Slip On pipe flanges under Class 400. For Slip On pipe flanges of Class 400 and greater, the standard raised face height is 1/4″.

James Duva, Inc. supplies a wide variety of Slip-on flanges that meet all specifications required for your job. We have a vast inventory available for quick delivery, in quantities both large and small, and are committed to setting the standard in customer service.

Whether you need a standard Slip On flange from stock, or a custom Slip On made to meet your specification, contact us today. Our experienced staff will be glad to assist.