Industrial Flanges

Stainless Steel 304 & 316 Flanges – Slip on FF / RF & WNRF

  • Stainless steel flange can withstand pressure ranging from 5bar to 16bar.
    Products available in stainless steel 304 and 316, 316L.
  • Surface Treatment: Anti-rust. Ideal for chemical plant or to any corrosive environment and medium.
  • Usage: Oil Field, Offshore, Water System, Shipbuilding, Natural Gas, Electric Power, Pipe Projects etc.

Stainless Steel 304 Blind Flanges – FF & RF

A Blind flange is round plate which has all of the relevant boltholes but no center hole, and because of this feature this flange is used to close off the ends of a piping systems and pressure vessel openings. It also permits easy access to the interior of a line or vessel once it has been sealed and must be reopened.

Flat Face( FF)  

Raised Face (RF)


Weld Neck (WN)


Blind Flange



  • Flat Face (FF) flange
    • The Flat Face (FF) flange has a gasket surface in the same plane as the bolting circle face. Applications using flat face flanges are frequently those in which the mating flange or flanged fitting is made from a casting.
    • Flat face flanges are never to be bolted to a raised face flange. ASME B31.1 says that when connecting flat face cast iron flanges to carbon steel flanges, the raised face on the carbon steel flange must be removed, and that a full face gasket is required. This is to keep the thin, bittle cast iron flange from being sprung into the gap caused by the raised face of the carbon steel flange.

  • Raised Face (RF) flange
    • The Raised Face (RF) type is the most applied flange face, and is easily to identify. It is referred to as a raised face because the gasket surfaces are raised above the bolting circle face.

  • Weld Neck flange
    • Weld-Neck flange is designed to be joined to a piping system by buttwelding. It is relatively expensive because of Its long neck, but is preferred for high stress applications. The neck, or hub transmits stresses to the the base of the hub to the wall thickness at the butt weld, provide important reinforcement of the flange. The bore of the flange matches the bore of the pipe, reducing turbulence and erosion. Weld-Neck flanges are best suited for severe service conditions, whether loading conditions are substantially constant or fluctuate between wide limits.
    • Weld Neck Flanges are flanges with the wall thickness of the flange having the same dimensions of the matching pipe, the lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the smaller the bore, they are normally used for high pressure, cold or hot temperature.
    • Weld-neck flanges have a higher life expentancy than slip-on flanges under duress.

  • Slip-On flange
    • Slip-On Flange is slipped over the pipe and then welded both inside and outside to provide sufficient strength and prevent leakage. This flange is used in preference to weld necks by many users because of its lower cost and the fact that less accuracy is required when cutting pipe to length.
    • The slip-on flange is positioned so the inserted end of the pipe or fitting is set short of the flange face by the thickness of the pipe wall plus 1/8 of an inch, which thus allows for a fillet weld inside the SO flange equal without doing any damage to the flange face. The back or outside of the slip-on flange is also welded with a fillet weld.
    • Slip-On flanges are commonly lower in price than weld-neck flanges.

  • Blind flange
    • Blind Flanges is a flange without a bore and is used to shut off a piping system or vessel opening. It also permits Easy access to vessels or piping systems for inspection purposes. Blind flange can be supplied with or without hubs at the manufacturers option.

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