RESTORE PRESSURE-TIGHT FLANGES IN-PLACE
Corroded, pitted, or mechanically damaged flange faces leak. Cooling water, fuel, steam, exhaust: any of these systems fails when the gasket can no longer seat. Replacing or workshop-machining large flanges in a marine environment costs weeks and forces extensive pipe disassembly.
OSM International's portable flange facing machines clamp directly to the pipe or valve body and restore the sealing face to the required flatness and surface finish. The work happens on the vessel or at the dock, with the pipe section left in place.
Our certified technicians have faced flanges in engine rooms, pump rooms, offshore topsides, and industrial process plants. Flange ODs run from 50mm to 4,000mm across every metallic material we machine.
Applications
- Pipe flanges to ASME B16.5 and EN 1092
- Sea water and cooling system flanges
- Steam, exhaust, and combustion flanges
- Heat exchanger channel and bonnet faces
- Valve body and bonnet seating surfaces
- Pressure vessel head faces
- Pump casing and discharge flanges
- Turbine and compressor inlet/outlet flanges
Technical Specification
Flange OD range
50-4,000mm
Flatness tolerance
0.025mm / 300mm
Surface finish
Ra 0.8-6.3µm
Standards
ASME B16.5 · EN 1092 · API
Materials
Carbon steel · SS · Inconel · Cu
Pressure rating
ASME Class 150-2500
HOW WE WORK
4-STEP PROCESS
01
Surface Inspection
Visual and dimensional inspection of flange face condition. Measurement of existing flatness, corrosion depth, and required material removal. Confirmation of flange standard and pressure rating requirements.
02
Machine Mounting
Portable flange facing machine mounted directly on the pipe or valve body. Laser or dial indicator alignment to bore centerline. Cutting tool selection for material type (carbon steel, stainless, Inconel, etc.).
03
Precision Facing
Single-point cutting pass to restore flatness. Feed rate and depth of cut optimized for surface finish requirement. Multiple passes available for heavily pitted or corroded faces.
04
Measurement & Report
Flatness verification to 0.025mm/300mm. Surface finish measurement (Ra). Full dimensional report with photographic documentation. Certification for pressure system reinstatement.
PROJECT GALLERY
WORK PHOTOGRAPHY
COMMON QUESTIONS
FLANGE FACING: ANSWERED
What is flange facing?
Flange facing machines the sealing surface of a pipe flange, valve body, or heat exchanger face back to the required flatness and surface finish. Corrosion, mechanical damage, or weld distortion leaves faces out of specification, and that causes leaks in critical pressure systems. Flange facing corrects the face without replacing the flange assembly.
Can flanges be machined without cutting the pipe?
Yes. Our portable flange facing machines clamp directly to the pipe or valve body and machine the sealing face in-place. No pipe cutting, no disconnection, no transport to a machine shop. You save days of piping work, and the system goes back into service the moment machining is complete.
What flange sizes can be faced onsite?
Our portable facing machines cover flange outer diameters from 50mm up to 4,000mm in all metallic materials: carbon steel, stainless steel, duplex, Inconel, and copper-nickel alloys. We handle ASME Class 150 through 2500 pressure ratings in engine rooms, pump rooms, offshore topsides, and process plants.
What standards do you work to for flange facing?
We perform flange facing to ASME B16.5, EN 1092-1, and API 6A / API 17D standards, achieving flatness tolerances of 0.025mm per 300mm and surface finishes of Ra 0.8-6.3µm as required by the gasket type and pressure class. All work is documented with certified dimensional reports.
How long does onsite flange facing take?
A single flange face is typically machined in a few hours; multi-flange or large-diameter work runs one to two days on site. We mobilize within 24 to 48 hours, so the line or vessel is back in service far sooner than a workshop turnaround.
GET STARTED
REQUEST FLANGE FACING
Describe the flange size, location, and leakage issue. We respond within 2 hours with a scope and mobilization plan.
24/7 EMERGENCY LINE
REQUEST SERVICE
We respond within 2 hours. Emergency? Call +1.800.903.1509