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What should a good refaced flange surface finish look like?

Posted by Simon Pownall on Mar 21, 2014 5:22:00 PM


    

A high quality surface finish on a recently resurface flange should be easy to identify. The flange mating surface should be consistent across the entire finish.  There should be no discolouration and the cutting depth should be the same across the whole face.

The photo below shows three different surface finishes for a recently refaced flange (this was a test piece).

three-flange-surface-finishes

Surface finish for gasket seal

A flange face that mates with a gasket requires a deeper surface finish in order to create the necessary seal required to prevent slippages between the flange faces.

You can see in the image below the more pronounced grooves on the right hand side. This is the ideal finish for a gasket seal.

gasket_seal_flange_surface_finish

Smooth finish for RTJ or Raised-Face Flanges

Our Flange Facing Machines are capable of refurbishment refacing most commonly used flanges including RTJ and RF flanges. For the RTJ flange, a smooth surface finish would be used due to the lack of a gasket with the seal being created by the pressure on the ring running around the centre of the flange flange. Likewise, on a raised-face flange, outer face of the flange with the bolting holes would require a smooth surface finish with the inner mating face requiring a gasket seal finish as above. The smooth surface finish is shown below.

smooth_flange_surface_finish

 

And you're flange facer needs repairing when...

The photo below is from a flange refacing that had gone wrong due to bearings within the machine being faulty. This meant the machine was not balanced correctly and caused a terrible surface finish.

Should you ever see a surface finish that looks like this, please, for everyone's sake, get your flange facing machine repaired.

terrible-flange_face-surface-finish

To find out more about Mirage Flange Facing Machines, download our Flange Facing Machine Buyers Guide.

Download Mirage Machiones Flange Facing Case Study Pack

Topics: On-site machining

   

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