Weld Neck Flanges

Ring joint gaskets for RTJ weld necks

As higher pressure classes require this type of flange connection almost exclusively, weld neck flanges are often made with a ring type joint facing (otherwise known as RTJ face). This sealing surface allows for a metallic gasket to be crushed between the grooves of both connecting flanges to form a superior seal and complement the high strength weld bevel connection to the pressurized pipe assembly. An RTJ weld neck with a metal gasket connect is the primary choice for critical applications.

---

LONG WELD NECK FLANGES

Also known as nozzle flanges or “long neck” flanges, these items were designed specifically with the pressure vessel and tank fabrication industry in mind. They are usually made as a one-piece construction with the intention of replacing a standard weld neck and pipe weld combination. The lack of a necessary weld connection is the defining feature of this flange style.They usually have one straight thru bore with a square cut end (instead of the typical weld neck bevel). Generally, the bore size of the long weld neck is the exact same as the actual nominal pipe size but can be changed as necessary. The overall length of the nozzle flange is also up to the end user, and the body of the nozzle can be modified to some pre-existing sizes or custom sizes for additional reinforcement. The base of the neck connecting to the base of the flange is slightly radiused to alleviate the abrupt perpendicular connection between both portions of the flange and to solidify the idea of a reinforced one piece construction.

---