What is a Type A stub end?
Type A – Type “A” Stub Ends are for use with standard Lap Joint Flanges. The Lap thickness on the Stub End is greater than, or equal to, the nominal thickness of the pipe wall. Also, type “A” has its outside corner radius to receive Lap Joint Flanges. The inside corner is square.
What is lap joint stub end?
Lap joint stub ends are fittings used in place of welded flanges where rotating back up flanges are desired.
What is a lap joint flange?
A lap-joint flange is a two-component assembly, with a stub end that has a lap-joint ring flange placed over it. This type of flange connection is particularly useful for large or hard-to-adjust flanges. The lap joint flange can be used in sizes and pressure classes similar to that of a weld-neck flange.
What is stub end for?
What is a stub end and why should it be used? Stub ends are buttweld fittings that can be used (in combination with a lap joint flange) alternatively to welding neck flanges to make flanged connections.
What is a stub end flange?
Used in conjunction with a backing flange, a Stub End is, essentially, a short length of pipe with one flared end and one square-cut end, which is welded to a pipe of the same NPS, material grade and schedule. Type A Stub Ends are produced and machined to fit Lap Joint flanges. They are the most common.
What is a pipe stub end?
What is stub end used for?
Stub ends are buttweld fittings that can be used (in combination with a lap joint flange) alternatively to welding neck flanges to make flanged connections.
Is a lap joint flange raised face?
Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a “Lap Joint Stub End”. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).
Are lap joint flanges flat?
A lap joint flange has a flat face, which is not used to seal the flanged joint but simply hosts the back of a stub end. The sealing surface is actually on the stub end itself and may be either flat face or raised face.
