Special Flanges-Long Weld Neck Flange
As the name suggests, long weld neck flange has long neck than regular weld neck flange. Other than neck, all the dimensions are same as the regular flanges. You can see the difference in the image. It is used as a nozzle in the pressure vessel and heat exchanger.
Here, in these images, you can see that Long neck has two advantages over the normal pipe to flange connection. First, it does not require pipe piece and second it eliminates a but weld between pipe and flange that required in case of conventional nozzle connection.
These types of flanges are normally used in high pressure and temperature application. It is costly but gives high reliability and reduce fabrication efforts as compared to normal pipe to flange type nozzle.
ASME B16.5 covers the dimensions of the long weld neck flanges.
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