Lap Joint Flange Fabrication

paddle blind

Fabricated Flanges

Benchmark has supplied and fabricated a wide variety of piping products in support of the Oil & Gas Industry, LNG Plant Construction, Marine Services and Pulp / Paper Plants.

All of our custom fabricated steel flanges come in a wide variety of carbon and stainless steel including 304 and 316 SS fabricated flanges. Our flanges are custom fabricated in Vancouver BC and are made with a variety of metals.

The variations of assemblies we have deployed are enormous, however typically a piping assemble consists of the following basic components:

Piping, Flanges, Valves, Fittings, Stud Bolts, Gaskets, Isolation Kits and Pipe Spools AKA Flanged Spools.

Lap Joint Flange Fabrication

lap joint flange fabrication

1. Lap Joint flange
2. Stub End
3. Butt weld
4. Pipe or Fitting

Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a “Lap Joint Stub End”.

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.

Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.

They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).

Lap Joint flanges have certain special advantages:

  • Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
  • Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
  • In systems which erode or corrode quickly, the flanges may be salvaged for re-use.

Please contact us today for more information about our wide range of Piping Products and Fabricated Piping Products. If you don’t see the type of gasket you need here? Not to worry! Benchmark has local stock on hundreds of types of Piping Products not listed and are updating our online inventory daily. What’s more if we don’t have it we will find someone who does and deliver to your site as fast as same day if possible.