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What is the difference between a full face flange, and a stub flange? Do I need to use a backing ring for a full face flange?

April 26, 2017backing Face flange ring stub

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What is the difference between a full face flange, and a stub flange? Do I need to use a backing ring for a full face flange?

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Use of metal backing rings is recommended for both types of flange. A full face flange has an extended lip, which the backing ring sits flush against; bolts pass through the lip of the flange (flanges can be supplied pre-drilled to specific flange tables, or undrilled). A stub flange has only small lip, and flange bolts do NOT pass through the body of the stub – this adds flexibility of placement after installation (backing ring can be rotated to suit orientation of the valve/ etc that is being installed).