Flange Facing

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Flange Facing

Size: Can machine any size of flange, up to 5 metres Ø (we can develop as per requirement)

Flatness tolerances within 0.02mm for the smaller sizes and within 0.2mm for larger diameters Facing heads are available to machine hard to reach areas in conjunction with boring machines Grind- ing attachments fitted where Ra1.6μm or better if required

Comprehensive range of lange facing equipment finishing heads for Ra0.8μm.

Inside, outside diameter, surface or bore location and can be set to a required datum (eg ship's datum, adjacent component).

Related flanges can be machined concentric, parallel or to any required orientation in conjunction with portable measurement equipment.

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Flange Finishes

The ASME B16.5 code requires that the flange face has a specific roughness to ensure it is compatible with the gasket and therefore provide a high quality seal.

Smooth Finish

Stock Finish

Spiral Serrated

Concentric Serrated

Procedure To Perform The Job

  • Inspection of flange dimension.
  • Level face dimension checking with reference to drawings and nearer fixtures dimensions.
  • As per dimensions flatness and tolerances will be checked.
  • If the raise face height and flange thickness is under tolerance limit then only we will start machining and remove taperedness and any scratches over face.
  • Machine will be setup through with the measuring instrument like dial gauge, bore gauge and level alignment tools with reference to Face and internal diameter of flange.
  • After taking clean cut, our engineer will measure raise face height and start serration operation over it.
  • For every flange we will follow standard drawing and make every flanges under tolerances dimensions.
  • After machining we will generate dimensional report and pass QC under Lnt personnel.
  • Inspection of flange dimension.
  • Level face dimension will be checked with reference to drawings and nearer fixtures dimensionsfor flatness.
  • If raise face height is not under tolerance limit, then welding deposition have to do for extra material.
  • Then machine setup will be done. Machine will be setup through with the measuring instrument like dial gauge, bore gauge and level alignment tools with reference to Face and internal diameter of flange.
  • We will start machining and remove taperedness and any scratches over face.
  • After taking clean cut, our engineer will measure raise face height/flatness as per drawing and start serration operation over it.
  • For every flange we will follow standard drawing and make every flanges under tolerances dimensions.
  • After final machining we will perform DP test to check welding defects.
  • If welding defects detects then we have to remove that defects over minor material drilling and again fill welding over it and again machining will be done over it.
  • After machining we will generate dimensional report and pass QC under Lnt personnel.

Machine  Usage  Application

  • Variety of surface faces achievable, concentric, square, eccentric or off-set
  • Ring-type joint groove; hub-type flanges; recessed faces; raised faces;
  • 'O' ring grooves; lens ring grooves; counterbore.
  • Back spot faced or entire back face machined parallel to the front face

Flange Facing

The process of flange facing involves the machining of flange mating surfaces on pipe and vessel connectors to produce a tight, leak-proof seal when assembled.

Types Of  Flange Damage

This type damage is narrow and elongated with sharp, shallow bottoms. However, depending on the force that created them, they can be deep.

Frequently, this type damage is created by a sharp object dragging across the flange face. These objects may include the bristles of a wire brush or a tool, such as a chisel.

These are wide and elongated with blunt, rounded bottoms and are created by a dull object dragging across the flange face. Gouges can be caused by objects—such as a screwdriver, flange jack or chisel.

This damage is usually small, somewhat rounded areas of concentrated material loss created by corrosion. Often, pits occur in clusters or groups

This type damage can be sharp or blunt on elongated areas caused by some form of impact. Dents sometimes result from equipment collisions caused by positioning the mating flanges WHEN using cables and rigging.

GASKET TYPES

Metal gaskets and those with less conformable metallic contact surfaces require a very smooth surface finish. Solid metal and corrugated designs offer very litle forgiveness to flange finish or bolting and assembly deficiencies. A typical flange surface finish recommendation for these types of metal-contact gaskets is 64-µin Arithmetic Average Roughness Height (AARH)/Root Mean Square (RMS) or smoother.

So, gaskets, such as compressed fiber sheet and rubber can be more forgiving to misalignment and out-of-parallelism of the flange. A rougher surface finish is generally recommended for soft, non-metal reinforced materials to create the necessary friction for stability and tightness between the mating surfaces. A typical surface finish recommendation for these materials is 125- to 250-μin or rougher.

Made by combining soft nonmetallic materials as fillers, facings or insertions with a metallic core or cover. Designs include spiral wound, corrugated and jacketed. The combination of the tougher, more creep resistant metal with a more conformable facing or filler,such as PTFE and flexible graphite provides great advantages, particularly in more severe applications. For those with facing and spiral wound gaskets, a wider range of surface finishes can be tolerated such as 125- to 250-μin. For metal jacketed gaskets with soft filler, 64- to 125-μin is generally preferred.

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