Flanges

Approx. 1,500 / Piece Get Latest Price

Reducing flanges, otherwise called reducer flanges, have an opposite function than expander flanges seen above, i.e. they are used to decrease the bore of a pipeline.

The bore of the run pipe can be safely reduced by only 1 or 2 sizes (otherwise a solution based on the combination of a butt weld reducer and a standard flange has to be used).

Reducing flanges are available in most sizes and material grades, and are not generally available from stock.

Reducing flanges follow the same considerations in terms of specifications, sizes and material grades as expander flanges.  

Approx. 200 / Piece Get Latest Price

Threaded flanges are joined to pipes by screwing the pipe (which has a male thread, generally NPT per ASME B1.20.1) onto the flange, without seam welds (in certain cases, though, small welds are applied to increase the strength of the connection).

Threaded flanges are available in sizes up to 4 inches and multiple pressure ratings, however, they are used, mostly, small size piping in low pressure and low-temperature applications, like water and air utility services.

Threaded flanges are also a mandatory requirement in explosive areas, such as gas stations and plants, as the execution of welded connections in such environments would be dangerous.

Consult this article, to find about the dimension of ANSI/ASME threaded flanges.  

Approx. 400 / Piece Get Latest Price

Long weld neck flanges (“LWN”) are similar to weld neck flanges, with the exception that the neck (tapered hub) is extended and acts like a boring extension.

Long weld neck flanges are generally used on vessels, columns or barrels. These flange types are available also in the heavy barrel (HB) and equal barrel (E) types.

Approx. 150 / pc Get Latest Price

 slip on flange class 150, 300, 400, 900, 1500, 2500 in inches and in millimeters. SLIP-ON FLANGE DIMENSIONS IN INCHES SLIP-ON CLASS 150 Slip on flange dimensions class 150 in inches (ASME B16.5) FLANGE NPS Inside Diameter Outside Diameter Bolt Circle (BC) Raised Face (R) Raised Face (RF)  

Approx. 150 / Piece Get Latest Price

Lap joint flanges feature a flat face and are always used in conjunction with a stub end.

Lap joint flanges resemble, in shape, slip-on flanges except for the radius at the crossing of the flange face and the bore to accommodate the flanged portion of the stub end.

A lap joint flange slips over the pipe and seats on the back of the stub end and the two are kept together by the pressure of the bolts.

The use of lap joint flanges in combination with stub ends is a cost-effective solution for stainless steel or nickel alloy pipelines, as the material of the lap joint flange can be of a lower grade (generally carbon steel) than the material of the stub end (which has to match the pipe grade, as in contact with the conveyed fluid).

This arrangement, therefore, has these two advantages:

1. reduces the overall cost of the pipeline’s flanged joints, as the use of higher grade materials is minimized;
2. bolting operations are simplified, as the lap joint flange can be rotated around the pipe to help with bolts alignment.

The dimensions and weights of lap joint flanges are shown in this article.