Flange

Blind Flanges
No center hole and are used to seal off a piping system. As a result, one can easily execute pressure tests cost effectively.

Lap Joint Flanges
Use a stub end (Type A, B or C) and slide over the pipe. They are also known as loose-ring flanges and back-up flanges. Lap joint is used with lapped pipe and allow for frequent cleaning and inspection through dismantling. They are very durable and can be used because the fluid conveyed in the system does not come in contact with the flange.

Slip On Flanges
Also known as hubbed flanges, are thinner than other flanges and are traditionally used in low pressure systems. This type slips onto the pipe and the fillet weld is applied at both the top and bottom of the pipe flange. These welds provide extra strength and prevent leakage. While the installation is low cost and easy, the welding does add cost to its installation.

Socket Weld Flanges
Designed for small size, high-pressure piping systems that do not carry corrosive fluids. The pipe is inserted into the socket and a single fillet weld on the outside of the flange is applied.

Threaded Flanges
Used in applications that are low pressure on smaller, thick walled pipes. Given their threaded connection, they do make it easy to disconnect the piping system.

Weldneck Flanges
Have a long neck that is butt welded to pipe. This type is also known as a weld bend flange. Since the bore of the neck matches that of the pipe, it reduces erosion and turbulence.