The dimensions and weights of slip-on flanges ANSI/ASME are available on this page.įlanged joints made with slip-on flanges are, in the long run, a bit more fragile than connections made with welding neck flanges (in similar service conditions). Slip-on flanges are also defined “Hubbed Flanges” and they are easy to recognize due to their slim and compact shape. The bore size of a slip-on flange is larger than the outside diameter of the connecting pipe, as the pipe has to slide inside the flange to be connected by the execution of a fillet weld. Long weld neck flanges (“LWN”) are similar to weld neck flanges, with the exception that the neck (tapered hub) is extended and acts like a boring extension.Ī slip-on flange is connected to the pipe or the fittings by two fillet welds, one executed inside and one outside the cavity of the flange. The dimension and weights of ASME weld neck flanges are shown in this article.
Other words for split system full#
The dimension of the flange (NPS and the pipe schedule) shall match the dimension of the connecting pipe.Ī welding neck flange is connected to a pipe by a single full penetration V-shaped butt weld. The tapered hub allows a smooth distribution of the mechanical stress between the pipe and the weld neck flange and facilitates the execution of radiographic inspections to detect possible leakages and welding defects. The absence of pressure drops prevents negative effects as turbulence and erosion/corrosion of the metals in the proximity of the flanged joints. This flange type is used, normally, in high-pressure and 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). WELDING NECK FLANGEĪ welding neck flange (“WN”)features a long tapered hub that can be welded with a pipe. Let’s now dive in, showing the key types of flanges with pictures.
Flanges are used, alternatively to welded connections, to facilitate maintenance operations (a flanged joint can be dismantled quickly and conveniently). The type of flange to be used for a piping application depends, mainly, on the required strength for the flanged joint. In addition to these standard flanges, some special ones exist, called Weldoflange/Nipoflange and Elboflange, swivel flange, expander/reducer flange, and orifice flanges. Which are the most common types of flanges used in piping? How do they look like? The key types of flanges are the welding neck, long welding neck, slip-on, socket weld, lap joint, threaded and blind flanges.
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