TYPES OF FLANGES THAT ARE USUALLY USED

The type of flange to utilise in a piping application is mostly determined by the flanged joint's needed strength. Let's get started, with pictures illustrating the many sorts of flanges. A welding neck flange ("WN") has a long tapered hub on which a pipe can be welded.

This flange is typically utilised in high-pressure and high/low temperature situations where the fluid delivered by the piping system must flow freely (the bore of the flange matches with the bore of the pipe).The lack of pressure drops eliminates detrimental effects like as turbulence and metal erosion/corrosion around the flanged joints. The tapered hub enables for a smooth distribution of mechanical stress between the pipe and the weld neck flange, making radiographic examinations easier to perform and detecting probable leaks and welding faults. The flange's dimension (NPS and pipe schedule) must match the connecting pipe's dimension. A single full penetration V-shaped butt weld connects a welding neck flange to a pipe.
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WELDING NECK LONG

Long weld neck flanges (LWN) are identical to weld neck flanges, but the neck (tapered hub) is extended and works as a boring extension.

Weld neck flanges with a long weld neck are commonly found on tanks, columns, and barrels. These flanges are also available in heavy barrel (HB) and equal barrel (E) configurations. Check out Spectacles Blind Flange

FLANGE SLIP ON

Two fillet welds, one inside and one outside the cavity of the flange, connect a slip-on flange to the pipe or fittings. Because the pipe must slide inside the flange to be bonded by a fillet weld, the bore size of a slip-on flange is bigger than the outside diameter of the connecting pipe. Slip-on flanges are also known as "Hubbed Flanges," because their sleek and compact design makes them easy to spot.

FLANGE WITH THREAD Without seam welds, threaded flanges are linked to pipes by screwing the pipe (which has a male thread, commonly NPT per ASME B1.20.1) onto the flange (in certain cases, though, small welds are applied to increase the strength of the connection).Threaded flanges come in a variety of sizes and pressure ratings up to 4 inches, although they're usually utilised in tiny pipelines in low-pressure, low-temperature applications like water and air utility services. Threaded flanges are also required in explosive situations, such as petrol stations and plants, because welding connections in these environments would be harmful. Check out Welded Spectacle Blind Flange

WELDED SOCKET FLANGE A single fillet weld is used to join socket weld flanges to pipes on the flange's outer edge (different from the slip-on flange type that requires two welds).To make a flanged connection with a socket weld flange, the pipe must first be placed into the socket of the flange until it reaches the bottom of the flange, then elevated by 1.6 mm, and then welded, according to ASME B31.1.