Your flange may come in the form of either a lap joint flange or weld neck flange. Each of these types of flanges has its own strengths and weaknesses, so it’s important to know the difference before making your choice. Ultimately, you want to make sure that you can get the right fit, finish, and leak protection for your application while getting the best deal possible on your flange purchase. So let’s compare lap joint flanges vs weld neck flanges to see which one may be right for you!
A lap joint flange has one flat face. It can be welded to another flange or pipe, but it is weaker than a weld neck. The joints are usually pressure tested with air or water before being permanently sealed with epoxy or sealant. This type of flange is often used for water, steam and gas piping systems in households, hospitals and commercial buildings. A weld neck flange does not have a flat face because it comes pre-attached to a pipe.
A weld neck flange is a type of flange that utilizes an external welded band as its primary means of attachment. For those interested in working with weld neck flanges, it’s important to be aware of its limitations and strengths.
In particular, there are certain situations where weld neck flanges may not be ideal for use. When these situations arise, it may be necessary to substitute your weld neck for a lap joint flange. In other cases, both types of fittings can work together if properly utilized.
Different flanges are used for different purposes. The most common difference between lap joint and welded flanges is their structural design. Welded flanges have flat rings, whereas lap joint have raised rings that resemble a stack of coins.
Because of these structural differences, welded flanges are stronger than lap joint due to their 360 degree seal. They’re best suited for high-pressure situations, while lap joints are better for lower-pressure applications where heat resistance isn’t as crucial of a factor.
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