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Difference between Weld Neck & Long Weld Neck Flanges


The weld neck flange is a high-strength forged product that is most typically used to join pipes and parts in a piping system. This flange’s welding creates a robust connection that is simple to assemble and disassemble for periodic repair and maintenance.

When a flanged joint is required in a piping system, weld neck flanges link the two parts with a butt weld joint, which is the most commonly used joint in fabricating welded pipe systems. To butt weld a flange to a pipe, the flange is butted up to the pipe, and a welder welds the whole circle of the connection. Welding the neck creates a solid connection and is ideal for pressure vessels and other high-pressure applications like drilling rig standpipes.


Long Weld Neck Flanges are similar to weld neck flanges except for the extended neck, which works like a boring extension. Long weld neck flanges can be utilized in high-pressure and high-temperature industrial applications. They are being used in the oil and gas, as well as the petrochemical sectors.


Long weld necks, also known as nozzles, are often designed with square cuts to replace pipe rather than to be welded up to the pipe. As a result, long weld necks’ don’t have schedule bores. A standard weld neck flange has a weld prep at the tip of the neck for welding up to matching pipe, whereas long weld neck flanges, or “nozzles,” are square cut at the ends for use with your tank or other installation. The schedule bores for normal long weld neck flanges (excluding heavy barrels) are the same as the flange’s nominal size. For example, the bore size of a 2-inch Long weld neck flanges will also be 2.00 inches.


These flanges are readily available in the more usual lengths of 9″, 12″, and 16″, and also in any larger or smaller total length to meet your requirements. Typically, the longer the total length required, the larger the nominal size and pressure class of the flange. However, this is subjective and up to the customer’s decision. Contrary to common perception, there is no global “standard” length for these flanges because they are created specifically for the application.

Manufacturers offer many barrel sizes to meet the needs of their customers, ranging from the more frequent long weld necks, heavy barrels, and equal barrels to intermediate barrel products.

Long Weld Neck Flanges are available in several material grades. Long Weld Neck Flanges are often made of forged carbon and stainless steel grades, but customers also choose chrome alloy and nickel alloy nozzle flanges.

When people request or buy a Long Weld Neck flange, they have the flexibility of specifying any wall thickness and any additional custom weld bevel, although the standard for these flanges is established by the dimensions.

Now that you understand the distinction between weld neck and long neck weld flanges, you can choose which is best for your project. When looking for industrial long weld neck flanges, look for a manufacturer who specializes in high-strength forged products such as long weld neck flanges. Whatever type of pipe fitting you want, be certain that each component comes from a reliable source and is of the highest quality. When working with high-pressure oil and gas pipe systems, the best long neck weld flanges on the market are required.

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Difference between Weld Neck & Long Weld Neck Flanges

by Piping Mart time to read: 2 min