What is SORF flange


The full form of SORF flange is slip on raised face flange. Slip-on raised face flanges used with pipe (by weld) for connect the two different pipe. This type of flange is available with a variety of size and specification, used accordingly to the application. This type of flange connects with the pipe by the help of fillet welding at the hub and end of the pipe inside of the flange. The SORF flange is available in raised face, plain, and RT J faces and orifice configuration also. It is easy to fit and weld with different types of pipe specification. This is very important types of pipe fitting like olets, weldolet, sockolet, threadolet, elbows, gasket, pipe, reducer and others. 

Bolt flange selection chart

What is specification need during selection for SORF flanges?


There are types of specification for SORF flange selection. These are the following.          A- Size, B- Class, C- Standards,  D- Flange face type, E- Coating and surface treatment types Size- It is available in the following size (½” (15 NB) to 48″ (1200NB).

Class or Pressure rating

This is used for the following types of class, like 150, 300, 600, 900, 1500, 2500 Ratings DIN Standard PN6, PN10, PN16, PN25, PN40, PN64 etc.

Standards used for SORF flanges

There are the following standards for SORF flanges:

  1. Dimension standard (ANSI B16.5 / ASME B16.5) for MS, CS, SS304/316/317 and other material.
  2. Dimension standard (ANSI B16.47/ ASME B16.47) Series A & B used for above the 24 inches diameter pipe flange.
  3. Dimension standard BS10 MS, CS, SS304/316/317 and other material pipe flange.

Flange Face Type-

Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Coating/Surface Treatment – Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized.

Design standard

Material Grade Name (Design STD)
SS Slip On Raised Face Flanges ASTM A182, A240 F 304, 304L, 304H, 316, 316Ti, 316H, 316L, 316LN, 309S, 309H, 310S, 310H,317, 317L, 321, 321H, 347, 347H, 201, 202, 904L
Alloy Steel Slip On Raised Face Flanges ASTM A182 F1,F5,F9,F11,F22,F91
Carbon Steel Slip On Raised Face Flanges ASTM A105/A105N, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A694 F42, F46, F48, F50, F52, F56, F60, F65, F70, A516.60, 65, 70 (Spectacle Blind Flange, Spacer Ring/Spade Flange), Steel RST37.2, C22.8, IS: 2062
Copper Alloy Slip On Raised Face Flanges ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200,
Nickel Alloy Slip On Raised Face Flanges ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020).
Duplex Steel Slip On Raised Face Flanges ASTM A182, A240 F 44, F 45, F51, F 53, F 55, F 60, F 61

Image of SORF flanges

SORF flange uses

Sorf flanges are suitable for low-pressure and high pressure applications and its is also use for low and high temperature applications.

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