Goltens was contacted by a containership operator to inspect damage on its MAN 9L 48/60 main engine crankshaft. During operation, the main engine’s connecting rod bolts gave away and caused major damage to crankpin number 4. Goltens boarded the vessel at Dubai Maritime City for inspection.
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PRE-MACHINING Goltens fabricated custom machining rings for installation and machining of the rudder stock. In-Situ specialists mounted carried out an initial removal of 10.00 mm off the diameter to create a reference point for the machining of the running surface. …
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IN-PLACE MACHINING AND ANNEALING After the tender was awarded, Goltens in-place machinists first machined the crankpin to -4.5mm to remove all surface cracks leaving a hard spot 250mm x 120mm. Goltens then performed the annealing process and reduced the crankshaft …
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INSPECTION AND REPAIR PLANNING Goltens diesel experts were asked to inspect the damage and determined that the crankshaft could be salvaged within the rated diameter with in-situ machining and annealing. Crankpin journal number 7 (450mm diameter) and main journals number …
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DANGEROUSLY CLOSE TO THE LIMIT The owner opted to go with a competitor and allowed them to machine more than 5.00mm, dangerously close to the 6.00mm limit, from the 600.00mm crankshaft diameter. With less than half a millimeter remaining within …
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PROJECT FACTS COLT PIELSTICK PC 2.5V16 Location: San Diego, CA USA Max Hardness Pre-Annealing: 580HB Max Hardness Post-Annealing: 333HB Original Main Journal Diameter: 330.00mm Finished Diameter: 327.00mm (-3.00mm) Thrust Face Machining: -1.00mm (fore/aft) COLT PIELSTICK 2.5 V16 ANNEALING AND MACHINING …
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PROJECT FACTS WARTSILA 6L46C CRANKSHAFT Crankpin #2 hardness pre/post: 647HB/380HB Original diameter Crankpin #2: 450.00mm 450.00mm 447.00mm IN-SITU MACHINING REPAIRS Magnaflux and hardness checks on all crankpins Pre-annealing machining of crankpin #1 to 449.0mm to remove surface cracks Local grinding …
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Demonstration of annealing process Mitsubishi invited Goltens to demonstrate its annealing process on a crankshaft that had been intentionally hardened for the demonstration in its factory in Yokohama, Japan. Goltens technicians traveled to the factory and, following its GL-approved process, …
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PROJECT FACTS MAN B&W V9V40/54 Crankpin Diameter: 320 mm Pre Annealing Hardness: 630 Brinell Post Annealing Hardness: 320 Brinell Finished Crankpin Diameter: 316 mm (-4.0mm) CRANKSHAFT ANNEALING AND MACHINING REPAIRS Machining of new fillet radii Magnaflux crack testing and Hardness …
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THE DECISION Goltens machined the crankshaft to -4mm and to evaluate the condition of the shaft. It was determined that the hard spots did not lessen – in fact, they became worse. All of the surface cracks were removed, with …
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The customer decided to cut another -2.00mm to see if the hard area would get smaller and the hardness values would get lower. At diameter 346.00mm the hardness values and area were still out of the engine maker’s specifications. Goltens …
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IN-SITU ANNEALING PROJECT FACTS Caribe Mariner Ship Type: Container Ship Engine Make: MaK 8M32 Engine Output Mcr: 3,380kW/4,595HP (600RPM) Crankpin Diameter (Original): 280.00 mm Crankpin Diameter (Finished): 278.00mm Max Hardness pre-Annealing: 650HB Max Hardness post-Annealing: 308HB CRANKSHAFT AND JOURNAL REPAIRS …
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PROJECT FACTS French Guyana Powerplant Engine Make/Model: Pielstick PC2.5 18V Crankpin Dia. Pre machining: 315mm Crankpin Dia. Post machining: 312mm Max Hardness before Annealing: 647hB Max Hardness after Annealing: 325hB REPAIRS Full NDT inspection (Magnaflux and Hardness) Machining of crankpin …
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PROJECT FACTS Mexican Paper Mill Engine Make: Wartsila W18V32 Engine Output: 6,746 kW at 720 RPM Crankpin Diameter (Original): 310.00 mm Crankpin Diameter (Finished): 307.00mm Max Hardness pre-Annealing: 650HB REPAIRS Removed 1.50 mm from crankshaft prior to annealing Annealed the …
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PROJECT FACTS PIELSTICK 10PC 4.2V Vessel type: Fleet Replenishment Oiler Orig. Crankpin Diameter: 465.00mm Material Removed: 2.00mm Post Annealing Hardness: <300 Hb PIELSTICK ANNEALING AND MACHINING PERFORMED Inspected the crankshaft – performing run-out, Magnaflux and hardness checks on the shaft …
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PROJECT FACTS WARTSILA 18V46 Location: Dominican Republic Power Output: 17,550 @ 500rpm Original Crankpin Diameter: 450.00mm Material Removed: 4.00mm Pre/Post Annealing Hardness: >600Hb/<350 Hb WARTSILA 18V46 ANNEALING AND MACHINING WORK PERFORMED Inspected the crankshaft – performing run-out, Magnaflux and hardness …
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ANNEALING PROJECT FACTS Panamanian Power Plant Engine Make/Model: Wartsila W18V46 Engine Output: 10,000 HP Crankpin Dia. Pre machining: 450.00mm Crankpin Dia. Post machining: 447.00mm Distance between Webs: 450.00mm DIESEL GENERATOR REPAIRS Full NDT inspection (Magnaflux and Hardness) Machining of crankpin …
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PROJECT FACTS BEN KIEN SHIPYARD Vessel: M/V 9200T-03 Rudder stock Length: 4.610m Rudder stock diameter: 300/400/545/350mm Rudder stock weight: 9500 kg Machined length of Shaft: 770mm WORKSHOP REPAIRS Rudder stock cleaned & measured (before & after repair) Completed alignment check …
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PROJECT FACTS Wartsila SWD-280 Crankpin Journal Diameter: 220 mm Finished Journal Diameter: 216mm Pre-Annealing Hardness: >650 Brinell Post-Annealing Hardness: 250-300 Brinell REPAIRS Rough machining to remove all cracks (3.0 mm dia.) Annealing crankpin to reduce harness from >650 Brinell to …
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PROJECT FACTS MAN MITSUBISHI 9V 40-54 Main Journal Diameter: 320.00 mm Finished Diameter: 316.00 mm Pre-Annealing Hardness: 650 Brinell Post Annealing Hardness: 250-300 Brinell CRANKSHAFT ANNEALING AND MACHINING REPAIRS Annealing of the CP Journal #5 in – situ Machining of …
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PROJECT FACTS CENSA Nicaragua Engine Make: MAK 16CM32 Engine Output: 7,050 kW Engine RPM: 720 Hardness Pre-Annealing: 500+hB Hardness Post Annealing: <350hB Dia. Pre-Machining/Annealing: 278.5mm Finished Diameter: 278.0mm REPAIRS Performed Magnaflux crack test and hardness tests on crankpin #6 journal …
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DIESEL ENGINE PROJECT FACTS SWD 8SW280 Original Crankpin Diameter: 220.00 mm Finished Crank pin Diameter: 217.00 mm Main Journal Diameter: 220.00 mm Finished Main Journal Diameter: 218.00 mm Pre-Annealing Hardness (Max): 600 Brinell Post Annealing Hardness (Max): 375 Brinell DIESEL …
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