What You Need to Know About Long Weld Neck Flanges

It’s incredibly important that you not only understand exactly what you’re buying when ordering long weld neck flanges, but that you’re sure about the buyer you’ve chosen. An important aspect to consider, of course, is forged parts versus parts that have been crafted using other methods. Forged parts should generally be selected for parts made for piping systems. A long weld neck improves material traceability, reduces fabrication costs, improves strength and toughness, and eliminates additional inspection and testing.

But there is more to understand about long weld neck flanges, and indeed pipe flanges in general, than simply buying forged parts. With that being said, below is a quick primer on long weld neck flanges. The more that buyers are aware of when purchasing flanges, the better!

What Are Long Weld Neck Flanges?

Generally speaking, long weld neck flanges function much like general weld neck flanges. However, they have necks that are extended, acting like boring extensions. Therefore, they can be used in high pressure industrial applications, and also under high temperatures. Generally speaking, they are used in the oil, gas, and petrochemical industries. Often, they are used in conjunction with stainless steel flange fittings.

Do Long Weld Neck Flanges Have Schedule Bores?

There are a lot of issues to consider when evaluating long weld neck flanges. Long weld neck flanges are usually made with square cuts to replace pipe, rather than being welded up to pipe. As such, they typically do not have schedule bores. The square cut at the ends of the long neck weld flanges is made to be utilized with your tank, or with your alternate assembly.

How Long Are Long Weld Neck Flanges? What Are Their Barrel Varieties?

On a general level, these flanges will be found in the standard sizes for flanges and can also be customized for your specific needs. Usually, if the nominal size and pressure class of the flange is larger, the flange itself will need to be longer. But this is generally subjective, and flanges are made to the specifications of the customer. Although the lengths of nine inches, 12 inches, and 16 inches are typical, there is not a standard size of flange.

Additionally, there is a wide variety of barrel sizes on the market. Each type of barrel will offer different dimensions, and they can be made from different materials as well. Long weld neck flanges are usually made from both stainless steel grades and forged carbon, but they can potentially be made from other materials as well. Usually, you can discuss this with the company from which you’re buying your flanges.

Flanges, in general, can be made to order. It’s important that you ensure that your flanges suit your exact needs. With that being said, make sure to order yours carefully, with a trusted distributor like Lynco Flange & Fitting that fully understands your specifications.

Our team is here to help yours

Our team can speak directly with engineers, offering product knowledge and specific guidance about which parts are most likely to get the job done to your specifications. We'll get you the quote that makes the most sense. Try us.

Get a free quote