Lap Joint Flanges

Lap Joint flanges are used on piping fitted with 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.

Key Features:

  • Recommended in applications that require frequent dismantling of the flanges and pipe.
  • Used with a matching stub-end insert.
  • Can rotate to allow for an easy alignment of bolt holes.
  • Not recommended in extreme or high-pressure temperature applications.

Advantages of Lap Joint Flanges:

  • Lap Joint flanges have certain special advantages over other flanges. These are as follows:
  • Lap Joint flanges have the freedom to swivel around the pipe. This facilitates the lining up of opposing flange bolt holes.
  • Lack of contact with the fluid inside the pipe leads to the greater durability of these flanges.
  • In piping systems which corrode or erode quickly, the lap joint flanges may be salvaged for re-use.
  • 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.
  • They allow rotational alignment capability.

Product range
Range
½” (15 NB) to 48” (1200NB) in 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS ASA 150, ASA 300, PN 6,10,16,25, 40,64,100,160 ETC. Available with NACE MR 01-75

Stainless Steel
Grade : 304, 304L, 304H, 309, 310, 310S, 316, 316Ti, 316 L, 317, 317L, 321, 347, 347 H, 409, 410, 410S, 420, 430L

Duplex Steel
Grade : 2205 (UNS No. S31803), 2507 (UNS No. S32750)

Nickel Alloy
Grade : Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020), Titanium (Grade I & II)

Copper Alloy
Grade : UNS No. C 10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500, UNS No. C 70600 (Cu -Ni- 90/10), C 71500 (Cu -Ni- 70/30)

Standard

  • ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
  • DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
  • B.S : BS4504 , BS4504, BS1560, BS10
  • OTHER : PLATE, PLATE BLANK


Value Added Services

  • HOT DIPPED GALVANIZING
  • HEAT TREATMENT
  • CNC MACHINING
  • THREADING

 





copper
Sheets & Plates  |  Pipes  |  Bar & Wire  | Flanges  |  Pipe Fittings

» Stainless Steel Pipes & Tubes » Steel Coils and Sheet » Butt Weld Elbow » Forged Elbow » Lap Joint Flanges
» 304 Stainless Steel Pipes and Tube » Stainless Steel Plates » Butt weld Reducers » Forged Reducers » Long Weld Neck Flanges
» 304L Stainless Steel Pipes and Tubes » Alloy Steel Plates SA 387 » Butt weld Tee » Forged Tee » Orifice Flanges
» 304H Stainless Steel Pipes and Tubes » Mild Steel Plates and Carbon Steel Plates » Butt weld Stub Ends » Forged End Caps » Plate Flanges
» 310 Stainless Steel Pipes and Tubes » Abrasion and Wear Resistant Steel Plates » Butt weld Adapters » Forged Stub Ends » Slip on Flanges
» 316 Stainless Steel Pipes and Tubes » Boiler Quality Steel Plates » Butt weld Pipe Nipples » Forged Couplings » Socket Weld Flanges
» 316L Stainless Steel Pipes and Tubes   » Butt weld End Caps » Forged Plug and Bushing » Spectacle Flanges
» 316H Stainless Steel Pipes and Tubes     » Forged Boss » Threaded Flanges
» 321 Stainless Steel Pipes and Tubes     » Forged Union » Weld Neck Flanges
» 347Stainless Steel Pipes and Tubes     » Forged Steel Adapters  
» 410 Stainless Steel Pipes and Tubes     » Forged Pipe Nipples  
» Alloy Steel Pipes & Tubes        
» Mild Steel Pipes & Tubes        
» ERW Pipes & Tubes