Portable Flange Facing Machine (ID-Mounted, On-Site) — hero shot

Portable flange facer mounted inside a large flange bore on radial legs, facing the raised face

Portable flange facer centred on a large bolted flange with hydraulic drive hoses

Close-up of a flange sealing face resurfaced on site with the portable flange facer

Servo-driven portable flange facer machining a bolted flange in the workshop

Operator resurfacing a vessel nozzle flange on site with the portable flange facer

Portable flange facer clamped in a vertical nozzle flange, servo drive on the tool arm

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WFP / WFH / WFS Series ASME B16.5 ASME B16.20 EN 1092-1

Portable Flange Facing Machine (ID-Mounted, On-Site)

Name: Portable Flange Facing Machine (ID-Mounted, On-Site)
Brand: Kedes Machine
SKU: WFP / WFH / WFS Series

ID-mounted portable flange facer that resurfaces damaged sealing faces in situ — without removing the flange from the pipe. Cuts RF spiral serration, FF flat finish and RTJ grooves per ASME B16.5. Pneumatic, hydraulic or CNC servo drive across 5 size frames Ø 50 – 3000 mm.

Facing range (OD)

Ø 50 – 3000 mm

Mounting (ID)

Ø 50 – 2800 mm

Surfaces

RF · FF · RTJ

Drive options

Pneumatic · Hydraulic · CNC Servo

TYPICAL REPLY · 1 WORKING SHIFT (GMT+8)

01 Model Comparison

Pick your size — 5 models in the series.

	WFP-610 Pneumatic · 50 – 610 mm OD	WFP-1000 Pneumatic · 160 – 1000 mm OD	WFH-1650 Hydraulic · 500 – 1650 mm OD	WFS-2000 CNC Servo · 690 – 2200 mm OD	WFS-3000 CNC Servo · 1150 – 3000 mm OD
Facing range (flange OD)	50 – 610 mm	160 – 1000 mm	500 – 1650 mm	690 – 2200 mm	1150 – 3000 mm
Mounting range (bore ID)	50 – 508 mm	158 – 820 mm	500 – 1500 mm	690 – 2000 mm	1120 – 2800 mm
Drive type	Pneumatic	Pneumatic	Hydraulic	CNC Servo	CNC Servo
Rotation speed	0 – 42 r/min	0 – 33 r/min	0 – 22 r/min	0 – 20 r/min	3 – 12 r/min
Sealing-face profiles	RF · FF · RTJ	RF · FF · RTJ	RF · FF · RTJ	RF · FF · RTJ	RF · FF · RTJ
Tool post	360° swivel	360° swivel	360° swivel	360° swivel · CNC	360° swivel · CNC
Quote this model

02 Working Principle

How an ID-mounted portable flange facer works

An expanding mandrel passes into the pipe bore behind the flange and grips the ID — referencing the machine axis to the bore centerline. A rotating tool arm carries a radial slide and tool post out across the flange face. Because mounting is referenced to the pipe ID (not the flange OD or the bolt circle), the resurfaced face is automatically square to the pipe axis — which is what the gasket seats against under bolt-up load. The 360° swivel tool post lets the operator cut RF spiral serration, FF flat finish or RTJ groove geometry per ASME B16.5 / B16.20 without removing the flange from the line. Preloaded braking on the radial slide eliminates chatter when the tool crosses bolt holes — the typical failure mode of less-rigid facers.

WFP / WFH / WFS Series working principle diagram

03 Key Features

Built for the job site.

// 01

ID mounting — face square to the pipe axis

Grips the pipe bore, not the flange OD or bolt circle. The resurfaced face is concentric and square to the seal axis under bolt-up load. The standard reference for code-compliant flange repair.

// 02

RF · FF · RTJ from one tool post

360° swivel tool post cuts spiral serration on Raised Face, smooth finish on Flat Face, and machined groove for Ring Type Joint per ASME B16.20. No tool change for profile switch.

// 03

Preloaded braking — chatter-free interrupted cut

Critical on flange faces that have bolt holes — every revolution the tool crosses six to twelve voids. Preload on the radial feed slide prevents the tool from chattering or "grabbing" at hole edges.

// 04

Drive selection by site & duty

WFP pneumatic for refinery and offshore hazardous areas. WFH hydraulic for heavy-duty heavy-wall flange work (≥ 1.5 m). WFS CNC servo for repeatable production resurfacing on large vessel and turbine joints.

// 05

5 sizes covering 50 – 3000 mm

From small-bore valve flange (2") to vessel manway and turbine casing flange (10 ft). One architecture, modular mandrels and tool arms across the range.

// 06

Restores ASME B16.5 sealing geometry

Spiral serration finish 32 – 63 Ra μin per ASME B16.5 §6.4.5. RTJ groove dimensions per ASME B16.20. Resurfaced face passes the same gasket-seating tests as a new flange.

04 Industry Applications

Where this series earns its keep.

Refinery & pipeline flange resurfacing

On-site restoration of corroded RF and RTJ flanges on process and transmission piping. WFP pneumatic variant for Class 1 Div 2 / ATEX zones during turnaround windows.

See refinery & pipeline flange resurfacing solutions

Steam turbine & valve flange machining

Resurfacing horizontal-joint flanges on steam turbine casings, HP valve bodies and boiler header connections — where flange face squareness directly controls steam leak rate.

See steam turbine & valve flange machining solutions

Stern-tube, bulkhead & marine system flanges

Resurfacing stern-tube flanges, bulkhead penetrations and engine-room piping flanges in dry-dock and afloat-repair contexts.

See stern-tube, bulkhead & marine system flanges solutions

06 FAQ

Common questions about the WFP / WFH / WFS Series.

Can't find your answer?

When is on-site facing better than removing the flange to a workshop?

Almost always, for installed pipework. Removing a welded flange requires cutting and re-welding the joint — destroying the same surface you were trying to restore. On-site facing keeps the flange in place, references the cut to the pipe bore (which is the real seal axis), and is typically a 4-hour job versus a multi-day cut-and-reweld cycle.

How do I pick between WFP, WFH and WFS?

WFP (pneumatic) for hazardous-area work and small-to-medium flanges up to ~1 m. WFH (hydraulic) when wall thickness or material grade demands higher cutting torque — typical ≥ 1.5 m flanges. WFS (CNC servo) for repeatable production resurfacing where the cut profile must be identical across many flanges (e.g. a turbine overhaul with 20+ casing joints).

Can it cut a fresh RTJ groove or only restore existing ones?

Both. The 360° swivel tool post, with the correct insert, cuts a new RTJ groove to ASME B16.20 dimensions (R, RX or BX profile) on a flange previously machined as RF or FF — converting flange seal type without replacing the flange.

What surface finish does it deliver on an RF face?

Spiral serration at 32 – 63 Ra μin (≈ 0.8 – 1.6 μm) per ASME B16.5 §6.4.5. Pitch and depth match standard new-flange specification, so soft-spiral and CG gaskets seat against the resurfaced face exactly as on a new flange.

Next step

Get a quote within 24 hours.

Send us your spec sheet, pipe schedule, or drawing — our engineers reply with pricing, lead time, and recommended models.

01Send specs & drawings
02Receive quote within 24h
03Confirm & manufacture

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