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Pipe Flanges – Do’s and Don’ts

asked Jun 4, 2016 in Piping by Normandy (21,040 points)

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answered Jun 4, 2016 by Normandy (21,040 points)



  • RTJ grooves must be kept scrupulously clean, corrosion free and undamaged.
  • All rust and burrs must be removed, small scratches should be removed by polishing, other defects may mean component replacement.
  • Always visually inspect the surface finish of the flange for injurious defects. It should be clean, degreased and free of any defects, nicks or burrs. The permissible imperfections in flange surface finish specified in ASME B16.5, Table 3 are not allowed for critical applications. Raised Face and Flat Face flanges should also be checked for flatness with a straight edge.
  • Check the phonographic or concentric groove on the face of Raised Face and Flat Face flanges. Any radial defects for example will be virtually impossible to seal against.
  • Do not use unnecessary force, say by tirforing or pulling, to bring flanges which are clearly misaligned together. This may overstress adjacent pipework and will make sealing of the flanged joint difficult and unreliable. Instead, report the situation.
  • Do not mate flanges manufactured to different standards unless specified in an approved design.
  • When cleaning a flange face, never use a tool which may damage the surface finish. A soft wire brush is recommended.
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answered Jan 30, 2017 by TPham (5,010 points)

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