Slip-on Flange

on . Posted in Pipe Flange

sof flange 1Slip-on flanges, abbreviated as SOF, are designed to slip over the outside of pipe, long-tangent elbows, reducers, and swages.  The flange has poor resistance to shock and vibration.  It is easier to align than a weld neck flange.  This flange is ideal for low pressure applications since the strength when under internal pressure is about one third that of a weld neck flange.  This flange has a raised face.

Slip-on Flange Index





Slip-on Flange Advantages and Disadvantages

  • Slip-on flanges are easy to install, making them a popular choice for applications where quick assembly is required.  The flange simply slips over the pipe and is then welded in place.
  • Slip-on flanges are generally more cost effective than some other types of flanges.  Their simple design and ease of manufacturing contribute to their affordability.
  • The continuous bore of slip-on flanges provides a smooth transition for the flow of fluids, minimizing turbulence and pressure drop in the system.
  • Slip-on flanges are suitable for low pressure applications where the flange does not experience significant bending or stress.
  • The slip-on design allows for easy alignment of the flange during installation.  This can be beneficial in situations where alignment adjustments are necessary.
  • Slip-on flanges are generally not recommended for high pressure applications.  The welding of the flange onto the pipe can create stress concentrations, limiting their pressure carrying capacity.
  • The welding joint of slip-on flanges may result in a less rigid connection compared to other flange types.  This can be a concern in high stress or high vibration environments.
  • The quality of the weld between the slip-on flange and the pipe is crucial. Improper welding can lead to issues such as leakage and reduced joint strength.
  • Slip-on flanges may not be suitable for high temperature applications, as the welding joint may be susceptible to thermal stress.
  • Slip-on flanges have limited rotation capability once they are welded in place.  This can be a limitation in applications where rotational adjustment is necessary.
  • The welding seam of slip-on flanges can be more vulnerable to corrosion compared to the solid construction of some other flange types.  Proper coating and protection measures are important to mitigate corrosion risks.


Slip-on Flange Datasheets

The datasheets we have on this site are shown below.  For simplicity sake, only datasheets that adhere to B16.5 are shown.  ASME B16.5 covers flange dimensions from ½” to 24”.  For sizes larger than this, please visit our flange datasheets page.

 ClassFlat FaceRaised FaceRing Type Joint
ANSI 150 SO Flange ANSI 150 FF (in) SO Flange ANSI 150 RF (in) SO Flange ANSI 150 RTJ (in)
ANSI 300 SO Flange ANSI 300 FF (in) SO Flange ANSI 300 RF (in) SO Flange ANSI 300 RTJ (in)
ANSI 400 SO Flange ANSI 400 FF (in) SO Flange ANSI 400 RF (in) SO Flange ANSI 400 RTJ (in)
ANSI 600 SO Flange ANSI 600 FF (in) SO Flange ANSI 600 RF (in) SO Flange ANSI 600 RTJ (in)
ANSI 900 SO Flange ANSI 900 FF (in) SO Flange ANSI 900 RF (in) SO Flange ANSI 900 RTJ (in)
ANSI 1500 SO Flange ANSI 1500 FF (in) SO Flange ANSI 1500 RF (in) SO Flange ANSI 1500 RTJ (in)
ANSI 2500 SO Flange ANSI 2500 FF (in) SO Flange ANSI 2500 RF (in) SO Flange ANSI 2500 RTJ (in)


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