Lap Joint Flanges

Heading section

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.

Buying tips

Certain factors to consider are as follows:

  • Size
  • Design Standard
  • Material
  • Normal Pressure
  • Face Type
  • Durability
  • Corrosion Resistant
Lap Joint Flanges | Lap Joint Flanges Manufactures | Lap Joint Flanges Exporters | Lap Joint Flanges Suppliers
Lap Joint Flanges Flange | Lap Joint Flanges Flange Manufacturers | Lap Joint Flange Exporters | Lap Joint Flange Suppliers
Lap Joint Flanges Manufacturers India | Lap Joint Flanges Exporters India | Lap Joint Flanges Suppliers India

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.
The lap joint flange is practically identical to a slip-on except that 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 . The stub end is mated with the lap joint flange and used together in piping systems. There are many uses for this type of assembly, from saving costs to creating joint systems.
Lap joints do not come with any facing, and are therefore considered flat faced.
We provides ASME Code and Non Code Industrial flanges for the Petrochemical, Process, & Waterworks industries. ANSI, API, AWWA pipe flanges in carbon, stainless, alloys and chrome steel. Weld Neck, Slip on, Blind, Threaded, socket weld, Lap Joint, Orifice Flanges in sizes 1/2" to 198". These flanges are available in all of our stainless steel and chrome-moly grades from ½” to 36” and beyond, class 300 to 2500. We can also source many of your other grade requirements.
Lap-Joint Flanges are similar to Slip_On Flanges, the difference is it has a curved radius at the bore and face to accommodate a lap joint stub end. The lap joint flange and stub end assembly are normally used in systems requiring frequent dismantling for inspection.

Materials used:

  • Carbon steel
  • Stainless steel
  • Alloy steel
  • Brass
  • Cast Iron
  • Bronze
  • Aluminum
  • Thermoplastics
  • PVC etc.

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.
150#
Branch NB A B C D E F G x No. H I Weight KG
1/2" (15) 89 16 22.9 11,6 3 60.3 15.8 x 4 22.2 10 0.4
3/4" (20) 99 16 28.2 13.2 3 69.8 15.8 x 4 27.7 11 0.7
1" (25) 108 17 34.9 14.7 3 79.4 15.8 x 4 34.5 13 0.8
1 1/2" (40) 127 22 50.0 19.5 6 98.4 15.8 x 4 49.2 16 1.4
2" (50) 152 25 62.5 22.7 8 120.6 19.0 x 4 61.9 17 2.2
3" (80) 191 30 91.4 24.3 10 152.4 19.0 x 4 90.7 21 4.1
300#
Branch NB A B C D E F G x No. H I Weight KG
1/2" (15) 96 22 22.9 14.7 3 66.7 15.8 x 4 22.2 10 0.7
3/4" (20) 117 25 28.2 16.3 3 82.6 19.0 x 4 27.7 11 1.1
1" (25) 124 27 34.9 17.9 3 88.9 19.0 x 4 34.5 13 1.4
1 1/2" (40) 156 30 50.0 21.1 6 114.3 22.2 x 4 49.2 16 2.6
2" (50) 165 33 62.5 22.7 8 127 19.0 x 8 61.9 17 3.4
3" (80) 210 43 91.4 29 10 168.3 22.2 x 8 90.7 21 6.1
600#
Branch NB A B C D E F G x No. H I Weight KG
1/2" (15) 96 29 22.9 21.3 3 67 15.8 x 4 22.2 10 0.8
3/4" (20) 117 32 28.2 22.9 3 83 19.0 x 4 27.7 11 1.4
1" (25) 124 34 34.9 24.5 3 89 19.0 x 4 34.5 13 1.6
1 1/2" (40) 156 39 50.0 29.3 6 114.3 22.2 x 4 49.2 16 3.1
2" (50) 165 44 62.5 32.4 8 127 19.0 x 8 61.9 17 3.7
3" (80) 210 53 91.4 39.8 10 168.3 22.2 x 8 90.7 21 7.3
900#
Branch NB A B C D E F G x No. H I Weight KG
1/2" (15) 121 39 22.9 29.3 3 82.6 22.2 x 4 22.2 10 1.7
3/4" (20) 130 42 28.2 32.4 3 89 22.2 x 4 27.7 11 2.3
1" (25) 149 48 34.9 35.6 3 102 25.4 x 4 34.5 13 3.4
1 1/2" (40) 178 51 50.0 39.8 6 123.8 28.4 x 4 49.2 16 5.4
2" (50) 216 64 62.5 45.1 8 165 25.4 x 8 61.9 17 9.8

Notes :-

Flanges dimensions to ANSI B16.5.

Larger Outlet Sizes are available on application.