Flange Types

This flange slides over the pipe or fitting. The recommended method of attaching a Slip On is to weld at both the flange hub and the pipe end. Sometimes under mild service conditions only one weld is made which is commonly at the pipe end. Slip On flanges are sometimes preferred over welding neck flanges as a result of their typically lower cost, the lower accuracy required for cutting the pipe to length, and their slightly greater ease of alignment of the assembly.

Even with these considerations, their final installed cost is probably not much, if any, less than that of welding neck flanges. When compared to welding neck flanges, the calculated strength under internal pressure is approximately 66%, and their life under fatigue is only about 33%. Because of this, slip-on flanges are found only in sizes ½" to 2 ½" in the 1500 lb standard and are not shown in the 2500lb standard.

Tri-Lad manufactures Slip On flanges to the following Specifications.

• ASME/ANSI B16.5
• INDUSTRY STANDARD
• AWWA C207