An engineered high temperature resistant steel
- Excellent high temperature stability
- Very oxidation and carburization resistant to 2100°F
- Good resistance to thermal shock and quenching
- Socket weld flange features and benefits
Alloy 330 socket weld flanges are specifically designed for high temperature furnace applications. Alloy 330 socket weld flanges unique combination of properties allows this material to handle thermal shock from quenching, be oxidation and carburization resistant as well as handle thermal cycling well. As a result, alloy 330 socket weld flanges are found in high temperature applications like vacuum furnaces and high temperature exhaust applications.
Similar to a slip on flange, an alloy 330 socket weld flange has an added shoulder inside the bore hole. The socket weld flange is designed so that a pipe can be inserted into the socket of the flange until it hits the shoulder of the socket. The pipe is then backed away from the shoulder approximately 1/16 inches before being welded to the flange hub. This internal weld provides this type of flange added strength. In addition, by grinding the internal weld smooth, turbulence and flow restriction are minimized. Alloy 330 socket weld flanges are most commonly used on small diameter applications (1/2" through 4") and high pressure piping systems.
Socket Weld Flange Benefits
- Best for small size, high pressure applications
- Static strength equal to a slip on flange yet boasts a fatigue strength 1.5 times that of the slip on design
- Employs both a backside hub weld and an internal shoulder weld for increased strength
- Socket weld flanges delivers a lower risk of leakage than threaded flanges
- Socket weld pipes do not have to be beveled for weld preparation
- Butt-welded joints are easily fitted and no special machining
Socket Weld Flange Disadvantages
- The expansion gap and internal crevices left in socket welded systems can promote crevice corrosion.
- Socket weld flanges have two welds which makes them stronger yet more labor intensive to install. Due to the increased welding, it has become the practice to weld only at the hub of the flange, which is not recommended.
The socket weld pipe fittings should allow for expansion gap of 1/16 inch (1.6 mm) between pipe and the shoulder of the socket.