How does a lap joint flange work?
How does a lap joint flange work?
A lap-joint flange is a two-component assembly, with a stub end that has a lap-joint ring flange placed over it. The stub end is then butt welded to the pipe, and the flange ring can be rotated to align with the mating flange. This type of flange connection is particularly useful for large or hard-to-adjust flanges.
What is the advantage of lap joint flanges?
The pressure-holding capacity of lap joint flanges is little. But it is better than that of slip-on flanges. The Lap Joint works as a backing ring on the stub. The main advantage of lap joint flange is that the bolt holes can be aligned with the matching flange after the welds have been completed.
What is the difference between lap joint flange and slip-on flange?
lap joint flanges are very similar to a slip-on flange, with the main difference being that it has a curved radius at the bore and face to house a lap joint stub-end. Lap joint flanges and stub-end assemblies are typically used in situations where frequent dismantling is required for for inspection.
What is a flange adapter?
Flange adaptors join plain end pipe of ductile iron or steel, to flange valves, pumps, fittings and pipe — virtually all types of liquid and process equipment. They require no threading or welding, and allow for pipe misalignment.
What is a lap joint weld?
Lap Joint Welding Lap welding joints are essentially a modified version of the butt joint. They are formed when two pieces of metal are placed in an overlapping pattern on top of each other. They are most commonly used to joint two pieces with differing thicknesses together. Welds can be made on one or both sides.
Is a lap joint flange raised face?
On a Lap Joint, the flange slides over the pipe and the stub end is the connection where the gasket sits. The end where the gasket sits is the same outside diameter as the face of a raised face flange….Lap Joint Flange Datasheets.
Class | Flat Face |
---|---|
ANSI 2500 | Lap Joint, ANSI Class 2500 (in) |
What are the advantages of lap?
Advantages of lap joints include: Easy to prepare (does not require cut faces to be parallel or perfectly flat) Can be formed between two dissimilar metals, such as aluminum and copper. Accommodates different thicknesses (thinner piece must be welded on top)
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. The combination of a Stub End and a backing flange is generally used as an alternative to a standard flange.
How does a Van Stone flange work?
Van Stone style uses two pieces with center socket loose from the flange portion until tightened. These ANSI flanges, Van Stone style, utilize two pieces with center socket loose from the flange portion until tightened.
How does a flange work?
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.
Why are lap joint flanges used in piping?
However, if the piping needs to be frequently dismantled for inspection or cleaning, consideration should be made for lap joint flanges. They give the ability to swivel flanges and to align bolt holes which simplifies the assembly of large diameter or unusually stiff piping.
Why is the lap joint flange ring free to rotate?
The lap joint flange ring is free to rotate after the stub end is welded to the pipe, this is because it is not physically joined to the stub end. Once the flange joint has been assembled, the lap joint ring is no longer free to rotate.
How does a lap joint work?
On a Lap Joint, the flange slides over the pipe and the stub end is the connection where the gasket sits. The end where the gasket sits is the same outside diameter as the face of a raised face flange .
Are lap joint stub ends compatible with lap joint flanges?
However, Lap Joint flanges include a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Lap Joint Stub End making it only compatible to Lap Joint Stub Ends