Field Machining – Flange Facing

Standard range flange facing machine capacities:

  • Machine externally mounted: 0mm bore – 915mm O/D (0” – 36”)
  • Machine bore mounted: 28mm bore – 3500mm O/D (1.1” bore – 120”)


Feed rate, finishes and tolerances achievable from flange facers:

Standard finishes:

  •  1.6mm Ra to 6.3mm Ra (63 CLA to 250 CLA) plus gramophone finish
  • 0.8mm Ra to 1.6mm Ra (32 CLA to 63 CLA) using a grinding accessory


  • 0 – 30+ meters (0-100+ feet)

Machining tolerances:

• All tolerances for flanges, ring grooves and hubs specified for BS, ANSI and API can be achieved.

Site utilities required:

  • Air supply to within 15m (50 feet) of the workplace
  • Up to 5.38mm3/min @ 6 bar, (190 CFM @ 90 PSI) depending on the machine
  • Adequate lighting. Temporary lighting may be needed if working outside at night
  • Adequate scaffolding or staging where appropriate, with good access and egress
  • For the larger machines, the use of certified lifting equipment and rigging is required for off loading and setting up
  • Waste disposal facilities for the removal of swarf and debris


Flange facing

Flange facing is a process of machining the faces of flanged and other types of pipe and vessel connectors. It is used to repair faces either damaged from impacts with other components during construction or installation or from corrosion and erosion due to turbulent flow or cuts from casket leaks. Also included in the process of flange facing is the machining of hub profiles, the front and rear faces of heat exchangers, oval manways, oval handholds and sealing surfaces of pressure vessels and boilers is possible.

Flanges and connectors can be re-machined to original specifications conforming to relevant standards such as:

  • BS
  • ANSI
  • API

Machinable flanges are:

  • Full face
  • Raised face
  • Ring groove
  • Techlok/Grayloc type clamped connections
  • Flange plus connections
  • Blind
  • Lens rings
  • Tube bundles sheet face and back faces
  • Square, oval and irregular shaped manway doors

In addition, flange facers can be used to generate weld preps, with O/D mounted machines used for boring, using appropriate accessories. Grinding and polishing attachments are also available.

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