Shipbuilding Industry

On-site machining, surface engineering and component refurbishment for shipyards and marine equipment

Shipbuilding and marine maintenance involve large, complex components where dimensional accuracy, alignment and surface condition are critical.

Removing damaged equipment for workshop repair can be difficult, time-consuming or impractical – particularly when components are integrated into the vessel or shipyard structure.

PR Rolls provides specialised on-site machining, measurement, surface engineering and component refurbishment for shipyards, shipbuilding projects and marine equipment.

Our capabilities include:

• On-site machining
• Line boring
• Turning and milling
• Flange machining
• Grinding and surface restoration
• Shaft and journal repair
• Bearing seat restoration
• Industrial coatings
• Measurement and alignment
• Workshop refurbishment

The objective is to restore critical components where they are installed whenever technically appropriate, reducing unnecessary dismantling, transportation and downtime.

Maintenance Challenges in Shipbuilding & Marine Applications

Marine equipment operates in demanding conditions involving heavy mechanical loads, vibration, moisture, corrosion and continuous operation.

Typical maintenance and repair requirements can include:

• Worn shafts and journals
• Damaged bearing seats
• Misaligned bores
• Corroded surfaces
• Damaged flanges and sealing surfaces
• Dimensional wear
• Surface damage
• Machining deviations
• Wear in large mechanical interfaces
• Component damage during installation or operation

PR Rolls evaluates the actual condition and geometry before determining the appropriate repair method.

Inspect → Measure → Machine → Restore → Verify

On-Site Machining for Shipbuilding

Machine large components where they are installed

On-site machining is particularly valuable in shipbuilding because many components are too large, heavy or integrated into the vessel to be efficiently transported to a conventional machine shop.

PR Rolls brings portable machining equipment directly to the shipyard or vessel.

Depending on the application, services can include:

• Turning
• Milling
• Line boring
• Drilling
• Grinding
• Flange machining
• Honing and precision finishing

On-site machining can be used during newbuilding, installation, commissioning, repair, conversion and planned maintenance projects.

Instead of transporting the component to the machine tool, PR Rolls brings the machine tool to the component.

Line Boring & Bore Restoration

Restore alignment and geometry in large structures

Accurate bore geometry and alignment are critical for bearings, shafts, pins and other mechanical interfaces.

Wear, deformation, installation errors or mechanical damage can result in bores that are no longer correctly aligned or dimensioned.

PR Rolls provides on-site line boring and bore restoration for suitable marine and shipbuilding applications.

Typical applications can include:

• Bearing housings
• Shaft line components
• Hinge and pin bores
• Gearbox-related structures
• Large mechanical joints
• Other aligned bore systems

Where required, dimensional restoration can be combined with machining to rebuild worn areas before final finishing.

Shaft, Journal & Bearing Seat Repair

Restore critical rotating interfaces

Shafts, journals and bearing seats can become damaged through wear, corrosion, bearing failure, fretting or mechanical damage.

Where the underlying component remains suitable for continued operation, PR Rolls can restore worn areas using:

• On-site machining
• Grinding
• Metallic coating or plating
• Dimensional restoration
• Precision finishing

The damaged area can be rebuilt and machined back to the required dimensions.

This can provide an alternative to replacing a complete shaft or other valuable component because of localised damage.

Flange & Sealing Surface Machining

Restore accurate mating surfaces on-site

Large flanges and sealing surfaces require correct geometry to provide reliable mechanical connections and sealing.

Corrosion, mechanical damage, distortion or previous maintenance can affect the condition of these surfaces.

PR Rolls provides on-site machining for suitable:

• Flanges
• Sealing surfaces
• Mating faces
• Large circular interfaces
• Other precision mounting surfaces

Machining directly at the vessel or shipyard can reduce dismantling and allow the restored surface to be verified before assembly.

Industrial Coatings & Surface Engineering

Protect marine components against wear and corrosion

Marine components can be exposed to combinations of mechanical wear, moisture, corrosion and erosion.

PR Rolls provides industrial coatings and surface engineering for requirements including:

• Wear resistance
• Corrosion resistance
• Erosion resistance
• Dimensional restoration
• Application-specific surface properties

Depending on the component, coating can be integrated into a complete restoration process:

Inspection → Machining → Surface preparation → Coating → Precision finishing

The appropriate coating system is selected according to the substrate, operating environment, wear mechanism and required surface function.

Dimensional Restoration

Repair local damage instead of replacing the complete component

A large marine component may remain fully serviceable even though one critical area has become worn or damaged.

Typical examples include:

• Bearing seats
• Journals
• Shaft surfaces
• Seal areas
• Bores
• Flanges
• Other precision interfaces

PR Rolls can combine machining with metallic coating, plating or other surface restoration technologies to rebuild suitable areas to their required dimensions.

This approach can preserve valuable components and reduce the need for complete replacement.

Measurement & Alignment

Verify geometry before and after machining

Accurate measurement is essential when machining components that interact with shafts, bearings, couplings or other aligned equipment.

PR Rolls provides measurement and alignment services for suitable shipbuilding and marine applications.

Measurements can be used to:

• Determine existing geometry
• Identify alignment deviations
• Establish machining references
• Support installation
• Verify repaired components
• Confirm final geometry

Combining measurement with on-site machining allows the complete process to follow a controlled sequence:

Measure → Machine → Measure → Verify

Newbuilding & Installation Support

Correct and finish components during vessel construction

Not every machining requirement is caused by wear.

During newbuilding and installation, large components can require final machining or dimensional correction after fabrication, welding or assembly.

PR Rolls can support shipyards with on-site machining for requirements such as:

• Final dimensional correction
• Bore machining
• Flange machining
• Alignment-related machining
• Installation adjustments
• Correction of machining deviations
• Precision finishing

Performing this work after the component has been installed can help achieve the required final geometry in its actual assembled condition.

Ship Repair, Conversion & Modernisation

Restore existing equipment during planned projects

Ship repair and conversion projects frequently involve equipment that has been in operation for many years.

Components may require repair because of wear, corrosion or mechanical damage, while modifications can create new dimensional or alignment requirements.

PR Rolls can support these projects with:

Measurement + On-site machining + Grinding + Dimensional restoration + Surface engineering

The appropriate repair method is determined according to the condition and future function of the component.

Workshop Maintenance & Refurbishment

Complete restoration for removable marine components

Not every component needs to be repaired on-site.

Suitable removable components can be refurbished at the PR Rolls workshop.

Depending on the component, refurbishment can include:

Inspection → Measurement → Mechanical repair → Machining → Grinding → Surface restoration → Coating → Precision finishing → Dynamic balancing

This provides two complementary alternatives:

Large or installed component → On-site repair

Removable component → Workshop refurbishment

Typical Shipbuilding & Marine Applications

PR Rolls' technologies can be applied to a wide range of large and precision-critical components, including:

• Shafts and journals
• Bearing seats and housings
• Bores and aligned bore systems
• Flanges and sealing surfaces
• Drums and rotating equipment
• Hydraulic components
• Pump components
• Valve components
• Large fabricated structures
• Other marine machinery components

The deciding factor is not simply the type of component, but what geometry, dimension or functional surface needs to be restored.

Planned Maintenance & Emergency Repairs

Specialist machining when time matters

Shipyard and marine maintenance projects often operate within strict schedules.

PR Rolls can prepare portable machining equipment and specialist personnel according to the required repair and available maintenance window.

Several operations can be coordinated within one project:

Inspection → Measurement → Machining → Surface restoration → Alignment → Verification

On-site capabilities can also be valuable when unexpected component damage requires repair without unnecessary dismantling or transportation.

Repair, Restore or Replace?

A damaged marine component does not automatically need to be replaced.

Depending on its condition, the appropriate strategy may be to:

Repair – correct local damage.

Machine – restore geometry and dimensions.

Restore – rebuild a worn functional area.

Recoat – provide a renewed functional surface.

Refurbish – restore the complete component.

Replace – when repair is no longer technically appropriate.

The decision should be based on actual component condition, required function and future operating requirements.

Why PR Rolls for Shipbuilding?

Combine measurement, machining and surface restoration

Shipbuilding repairs often require several specialist capabilities.

A worn journal may require dimensional restoration followed by precision machining. A misaligned bore may require measurement and line boring. A damaged flange may require on-site machining and final verification.

PR Rolls combines:

On-site machining + Line boring + Grinding + Measurement & alignment + Industrial coatings + Dimensional restoration + Workshop refurbishment

This allows multiple stages of a repair to be coordinated within one project.

The objective is to restore the component where technically appropriate and return it to reliable operation.

Frequently Asked Questions

What shipbuilding services does PR Rolls provide?
PR Rolls provides on-site machining, line boring, turning, milling, grinding, flange machining, dimensional restoration, measurement, alignment and surface engineering for suitable shipbuilding and marine applications.

Can PR Rolls machine components directly on a vessel?
Yes. Portable machining equipment allows suitable large or installed components to be machined directly at the vessel or shipyard when site conditions permit.

Can worn shafts and journals be repaired?
Suitable shafts and journals can often be restored through machining combined with metallic coating, plating or other dimensional restoration technologies.

Does PR Rolls provide line boring for shipbuilding?
Yes. PR Rolls provides on-site line boring for suitable bearing housings, aligned bores and other large mechanical structures.

Can PR Rolls repair damaged flanges?
Suitable flange and sealing surfaces can be machined on-site to restore the required geometry and surface condition.

Does PR Rolls only work with repair projects?
No. PR Rolls can also support newbuilding and installation projects, where components require final machining, dimensional correction or alignment-related work after fabrication or installation.

On-Site Expertise for Demanding Marine Components

Large shipbuilding and marine components do not always need to be removed for repair.

PR Rolls combines portable machining, measurement, grinding, dimensional restoration and surface engineering to restore suitable equipment directly where it is installed.

From shafts, journals and bearing housings to bores, flanges and other large mechanical components, the work begins with understanding the actual condition and required geometry.

Measure → Machine → Restore → Verify → Return to operation

Contact PR Rolls to discuss an on-site machining, ship repair, newbuilding or component refurbishment requirement.