Different Types of Flanges

·       WELDING NECK FLANGE

A welding neck flange features a long-tapered hub that can be welded with a pipe. This flange type is used, normally, in high-pressure & high/low temperatures applications that require an unrestricted flow of the fluid conveyed by the piping system (the bore of the flange matches with the bore of the pipe). The absence of pressure drops prevents negative effects as turbulence & erosion/corrosion of the metals in the proximity of the flanged joints. You can find weld neck flanges manufacturer in India.

·       LONG WELDING NECK

Long weld neck flanges (“LWN”) are similar to weld neck flanges, with the exception that the neck (tapered hub) is extended & acts like a boring extension. Long weld neck flanges are normally used on vessels, columns or barrels. These flange types are available also in the heavy barrel (HB) & equal barrel (E) types.

·       SLIP ON FLANGE

A slip-on flange is connected to the pipe or the fittings by two fillet welds, one executed inside & one outside the cavity of the flange. The bore size of a slip-on flange is bigger than the outside diameter of the connecting pipe, as the pipe has to go inside the flange to be connected by the execution of a fillet weld. Slip-on flanges are also defined “Hubbed Flanges” & they are easy to recognize due to their slim & compact shape. Click here to find about slip on flanges manufacturer in India.

·       THREADED FLANGE

Threaded flanges are joined to pipes by screwing the pipe onto the flange, without seam welds (in certain cases, though, small welds are applied to increase the strength of the connection). Threaded flanges are available in sizes up to 4 inches & multiple pressure ratings, however, they are used, mostly, small size piping in low pressure & low-temperature applications, like water & air utility services.

·       SOCKET WELD FLANGE

Socket weld flanges are connected to pipes with the help of a single fillet weld executed on the outer side of the flange (different from the slip-on flange type that requires two welds).

·       LAP JOINT FLANGE

Lap joint flanges feature a flat face & are always used in conjunction with a stub end. Lap joint flanges resemble, in shape, slip-on flanges except for the radius at the crossing of the flange face & the bore to accommodate the flanged portion of the stub end. A lap joint flange slips over the pipe & seats on the back of the stub end & the 2 are kept together by the pressure of the bolts. Click here to know more about lap joint flanges manufacturer in India.