A reducer is a pipe fitting used to join to pipes of different sizes. The Expander Flange is a type of welding neck pipe flange used to increase pipe size at the flange connection.
A lap-joint flange is a two-component assembly, with a stub end that has a lap-joint ring flange placed over it. The stub end is then butt welded to the pipe, and the flange ring can be rotated to align with the mating flange.
Socket-weld pipe flanges are used on smaller sizes of high pressure pipes. These pipe flanges are attached by inserting the pipe into the socket end & applying fillet weld around it.
Spectacle Blinds are simple safety devices that are installed between two pipe flanges. The open end is installed as a spacer to allow uninterrupted flow. To stop the flow, the blind end is rotated into place between the flanges.
A Ring Type Joint (RTJ) Flange is a machined metallic ring having a deep groove cut into its face. When the connecting bolts of the RTJ flanges are tightened, the gasket is compressed and creates a tight seal.