LNG Tanker Wartsila Engine Repair Final Report

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LNG tanker Wartsila Engine repair Repair completed by LOCKNSTITCH Inc. July 2012

Transcript of LNG Tanker Wartsila Engine Repair Final Report

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LNG tanker Wartsila Engine repairRepair completed by LOCK‐N‐STITCH Inc.July 2012

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A1A Cam box damage

Damaged cam box area on A side

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Damaged area removed using a handheld grinder

Series of drilled holes to help with removal of the damaged area

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First set of stitching pins installedSecond set of stitching pins installed

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Locks installed completely around entire patch to add additional strength 

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Completed repair on A1A Cam box

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Damaged B1 Cam box

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Damaged area cut out and ready to accept patch

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Large patch fit into place

And a second patch was fitted at a different angle

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Stitching is almost completed and Locks are ready to be installed

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Second patch being stitched 

Locks installed around entire patch to add additional strength 

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Cam box B1 repair completed

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Damaged B1 Inspection door

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Cutting out damaged area to accept new casting around inspection door B side.

Area cut out to accept new casting.

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New casting for inspection door being manufactured  

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New casting being fitted and ready to start metal stitching

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Inspection door metal stitched and ready to have gasket surface machined

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Inspection door metal stitching completed

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Back side of inspection door opening with locks installed to add additional strength along the repair and the milling machine is being mounted

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Inspection door gasket surface being machined with our 7’ bed mill

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Inspection door metal stitching repair completed and the gasket surface has been machined.  

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Damaged A side inspection door

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Removing damaged area by grinding out area to accept new casting

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Damaged area removed and ready to accept new casting

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Metal stitching using our Castmaster stitching pins

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Gasket surface on inspection door repair completed ready to be machined 

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Inspection door A side gasket surface repaired and machined

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Damaged area on the inside of the water channel

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Removing damaged area by drilling holes from the bottom of the water channel

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Water channel damaged removed and ready to accept new casting 

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Making the template for the water channel casting

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New casting metal stitched and ready to be hand finished

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Water channel repair completed 

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CASTMASTERstitching pins havethe unique abilityto draw the sides ofa crack togetherwhen tightenedinto the drilled,Spotfaced andtapped hole.

CASTMASTER® Stitching Pins

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Specifications:

Tensile strength: L20B = 6650 PSI each; L20S = 13,125 PSI eachMaterial: heat‐treated 4130 steel

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Final repair inspection process

Final repair inspection process1. LNS technicians performed in‐process and final inspections of eachrepair site once the metal stitching process for that area wasconcluded.2. The process involved using a magnetic particle inspection processwith either dry powder or wet particle methods.3. The metal stitching locks and stitching pins have magnetic propertiesthat are slightly different from the cast iron so the outline of therepairs attracts the magnetic powder when a special magnet isplaced on the part with the North and south poles spanning therepair.4. This method quickly and easily shows any gaps between the pins orany crack that may have been missed.5. If a gap is detected on either side of the repaired wall, additionalstitching pins could have been added to the repair.6. The final inspection showed no spaces, gaps or cracks at or aroundthe metal stitching repairs that were repaired.

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This repair required eight (8) weeks to complete.

Completed repair byLOCK‐N‐STITCH Inc.1015 S Soderquist RdTurlock, CA 95380(209) 632‐2345