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Lap Joint Flange

Lap Joint flanges are used on piping fitted with lapped pipe or with lap joint stub ends. The lap joint flange with the stub end assembly are normally used in systems requiring frequent dismantling for inspection and cleaning and where the ability to swivel flanges and to align bolt holes materially eases the erection of large diameter or unusually stiff piping. These flanges are also used in applications where there is a need to facilitate bolt alignment. These type of flanges are similar to slip-on flanges. The only difference is that it has a curved radius at the bore and face to accommodate a lap joint stub end. They may be used at all pressures and are available in a full size range. These lap joint flanges slip over the pipe, and are not welded. They are otherwise fastened to it. Here the bolting pressure is transferred to the gasket by the pressure of the flange against the back of the pipe lap.



½" to 48" (As Per Customer Requirement)


150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS DIN Standard ND-6, 10, 16, 25, 40 Etc

Material Grade:

Carbon Steel Lap Joint Flange: ASTM A105, ASTM A 694 F42
Low Temperature Carbon Steel Lap Joint Flange: A350 LF2/A350 LF3
Copper Alloys Lap Joint Flange:
  1. ASTM / ASME SB 61 / 62 / 151 / 152
  2. C 70600 (CU -NI- 90/10
  3. C 71500 (CU -NI- 70/30)
  4. UNS NO. C 92200, UNS NO. C 83600,UNS NO C 10100
  5. C 10200, C 10300, C 10800, C 12000, C 12200
Nickel Alloys Lap Joint Flange: Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22, C276
Duplex Lap Joint Flange: ASTM A 182 UNS F 44, F 45, F51, F 53, F 55, F 60,F 61
Stainless Steel Lap Joint Flange: ASTM 182 F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L
Alloy Steel Lap Joint Flange: ASTM SA 182 F1/F5/F9/F11/F22/F91

Advantage of Lap Joint Flanges:

Lap Joint flanges have certain special advantages over other flanges. These are as follows:

  1. Lap Joint flanges have the freedom to swivel around the pipe. This facilitates the lining up of opposing flange bolt holes.
  2. Lack of contact with the fluid inside the pipe leads to the greater durability of these flanges.
  3. In piping systems which corrode or erode quickly, the lap joint flanges may be salvaged for re-use.
  4. The pressure-holding capacity of lap joint flanges is little. But it is better than that of slip-on flanges.
  5. The Lap Joint works as a backing ring on the stub.
  6. 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.
  7. They allow rotational alignment capability.

Value Added Services:

  1. Hot Dip Galvanizing
  2. Electro Polish
  3. Test Certificate As Per EN 10204 - 3.1 & 3.2

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