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What is a Flange?

Lap Joint Flanges

Lap Joint Flanges (LJ Flanges) are used on piping fitted with lapped pipe or with lap joint stub ends the combined initial cost of the two items being approximately one-third higher than that of comparable welding neck flanges.
Lap joint flange is having two components, a stub end, and a loose backing flange. Stub end is butt welded to the pipe and Backing flange freely move over the pipe. The backing flange can be of different material than stub material and normally of the carbon steel to save the cost. Lap flange is used where frequent dismantling is required, and space is constrained.

The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.

Lap Joint Flanges

The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face. This radius is necessary to have the flange accommodate a lap joint stub end. Normally, a lap joint flange and a lap joint stub end are mated together is an assembly system.

Lap joint flange
Standards, Dimensions & Weight

ANSI, MSS, API, AWWA, DIN, JIS, BS and GB.

free forging, plate cutting.

1/2" to 64" (and much larger size according to customers' demands).

Carbon steel and alloy steel with yellow print, black print, oil or zinc.

in wooden cases, wooden pallets or as per customers' special requirement, Standard Export Package.

* We can also manufacture special application flanges and forgings that customers require.

Lap joint flange draws :
Details of Lap Joint Flange
1. Lap Joint flange 2. Stub End 3. Butt weld 4. Pipe or Fitting

These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.

Flange Material:
  • Cabon steel: A105, A350 LF2
  • Stainless steel: A182 F304/F304L/F316/F316L/F321
  • Alloy steel: F11, F12


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