How to Install a Slip on Flange

How to Install a Slip on Flange

Slip on flanges usually “slip” over a pipe and are welded in place. This allows the flanges to swivel freely to easily align bolt holes prior to installing and welding in place.
Flanges are most often used to connect pipes that have diameters of more than 2 inches. The flange’s joint consists of two matching disks of metal, separated by a gasket, that are bolted together to achieve a secure seal with the gasket material. The flange is attached to the pipe by screwed fittings. The flange uses force provided by the bolts to pre-load the gasket. When internal pressure is applied, there is enough contact stress between the flanges and gasket to maintain a seal.
Check the flange and pipe to make sure there is no damage that may prevent a proper seal from being formed.
Slide the slip-on flange onto the pipe using your hand. Determine where you will be welding the flange to the pipe. In most cases, you will be welding the flange to the end of the pipe.
Use a welder to weld the insid