Types of Stainless Steel Flanges

Slip-on Flange

Slip-On Flanges are designed to have a low hub as the pipe is inserted into the flange before welding, ensuring sufficient strength and preventing leakages as it is welded on both sides. All Slip-On Flanges are manufactured with a slightly larger diameter than the outer diameter (O.D.) of the connecting pipe. Slip-On Flanges are prefered over Welding Neck Flanges due to their lower initial cost, but there may not be any significant differences in the final installation cost due to the additional welding.

Blind Flange

A Blind Flange is a type of flange without a bore, making it easier to close off one end of a pipeline system or access the interior of a line or vessel that may need to be reopened or accessed again in the future.

Lap-joint Flange

Lap Joint Flanges are essentially similar to Slip-On Flanges, except for the presence of a radius at the junction of the bore and flange surface. This radius is essential for the proper alignment of the flange with the lap joint stub end. Typically, lap joint flanges and lap joint stub ends are assembled in a joint system.

Threaded (Screwed) Flange

Threaded Flanges are similar to Slip-On Flanges, except that they have threads in the bore. The most significant advantage is that it allows for connection without welding. Threaded Flanges are particularly suitable for low-pressure processes at room temperatures and in high-explosion risk areas where welding poses a risk.

Socket welding Flange

Socket Welding Flanges are similar to Slip-On Flanges, except for the presence of a counterbore (opposite bore) in addition to the bore. The counterbore is manufactured slightly larger than the outer diameter (O.D.) of the matching pipe to facilitate easy insertion of the pipe into the flange. The slightly smaller inner diameter matches the inner diameter (I.D.) of the connecting pipe.

Welding Neck Flange

Welding Neck Flanges are commonly referred to as "High Hub" Flanges. They are designed to weaken the high pressure at the base of the flange by transferring pressure to the pipe. The Welding Neck Flange has the most exceptional design among the Butt-Welded Flanges that are currently being produced. Due to its unique design characteristics, Welding Neck Flanges tend to be more expensive compared to other flange types.