Having completed successful ballast water retrofitting of one of its LNG Carriers, Goltens Singapore was once again contracted by one of the world’s largest LNG owners and operators to complete similar turnkey retrofits on two 15- year-old, 83,000 DWT LNG carriers.
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A mining operation suffered a major bearing seizure on the crankpin of a slurry pump shaft. The pump makers approached Goltens to explore the possibility to repair and restore the crankshaft to original diameter in our workshop.
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Goltens acquired a “serviced” UG15D governor from a governor repair shop claiming to be Woodward authorized. Physically the governor looked like a UG15D however after further inspection was found to be only partially serviced and rebuilt with incorrect parts and worn parts.
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The crew of a nine year old container ship, equipped with a Wartsila 6RT-FLEX82C main engine, observed exhaust gas blow by on cylinder #5 during normal operation and could not increase the load above 35%. The cylinder liner had 22,452 running hours and the crew suspected the cylinder liner was excessively worn and needed to be replaced.
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A recently built general cargo vessel experienced a bearing failure on its intermediate propeller shaft bearing. Goltens was contacted to perform an inspection on the bearing shell and pedestal and to propose a solution. Upon inspection it was determined that the entire housing would require repair, due to extensive damage on the bearings, sealing areas, and housing mating surfaces.
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A leading seismic survey vessel operator selected Optimarin’s 334m3/hour OBS ballast water treatment system for one of its research vessels. Goltens had previously completed two successful retrofits for this owner and was awarded this retrofit as well. The timeline was relatively short with only a 3-month window between project kick off and completion of the installation.
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Goltens received a call from a Nuclear Power Station in upstate New York to perform an inspection on one of their EMD 645-20 Emergency Diesel Backup Generators (EDBG) for Unit 2, one of the two nuclear reactors that generate a combined capacity of 1,907MW power.
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INSPECTION AND WORK SCOPE Goltens determined that the shaft seal liner could be removed from the shaft but due to the short space between the shaft and shaft housing, special tooling and brackets would have to be fabricated at Goltens …
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PROJECT EXECUTION: Goltens prepared the detailed installation and chocking plan for class submittal and deployed a team to the site. Upon arrival, the port engine had already been lowered into position and Goltens proceeded to weld the jacking plates in …
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3D scanning & vessel survey Basic and Detail engineering Class approvals Procurement & Prefabrication Supply of Material to Shipyard (Big Bore piping, Small Bore piping, Site run Piping & fittings, Valves & Cable Drums) Installation supervision …
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BRIEF The vessel equipped with two variable speed Wartsila 9L20 propulsion engines each driving a propeller and fire pump. Each engine is equipped with a mechanical 3161 governor with pneumatic speed setting, shutdown solenoid and start fuel limiter solenoid. The …
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PLANNING & PREPARATION After surveying the vessel for rigging logistics, Goltens prepared all required lifting brackets and rigging gear at its work shop and reviewed the repair schedule and timeline with the customer. Goltens then mobilized the tools and a …
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Diamond Offshore contracted Goltens Houston to provide complete service maintenance and supervision for two 20,000 hour and three 10,000 hour overhauls on their engines. To minimize operational impact, Goltens technicians worked around the clock in two, twelve hour shifts in …
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LIFTING OPERATIONS Goltens’ diesel team arrived onsite with the most of the engine already disassembled by the powerhouse team. The team removed some remaining components from the engine, removed the foundation bolts from the engine and fit the 4 prefabricated …
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SCOPE OF REPAIR Goltens dispatched a team of Mechanical, Electrical & Instrument and Turbine Control experts to Bangladesh to carry out the scope of work assisted by local mechanics, riggers and fitters. Scope included: Preparation of special tools and replacement …
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Once the gearbox was moved to a safe work area and the gears were secured, Goltens machined the damaged areas on the gear to ready the surface for repair. Technicians then applied selective electroplating to the damaged gear teeth using …
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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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After preliminary meetings and discussions on the tolerances of the bush and tube Goltens proposed a combination of on-site and workshop efforts to complete the work. ON-SITE WORKSCOPE Port and Stbd. Bore alignment laser checks In-situ line boring of Port …
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BRIEF Two generators are dedicated to their respective Port and Starboard busbars, the third having two breakers to allow Port or Starboard feed. A coupler connecting the two busbars is normally closed and can be opened manually. The existing system …
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BRIEF The analogue 2301A LSSC is commonly used on supply vessels such as this, and in many other applications especially where isochronous load sharing between generators is desired. The 2301A was originally designed more than 30 years ago and is …
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3D SCANNING LEVERAGED TO SPEED PROCESS Given the limited availability & questionable accuracy of the engineering data of the existing plant, customer was genuinely concerned about the cost and time needed for performing the upgrade design. To overcome this challenge …
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THE INSPECTION Goltens got the call on Sunday and engineers were on site the next day to evaluate the condition of the shaft and identify a repair method for the damage on the EDBG. Goltens undertook an inspection of main …
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WARTSILA 18V32LN ENGINE BLOCK REPAIR Goltens performed laser scanning on the damaged areas to facilitate the casting of precise inserts for the block. Goltens cropped the damaged interior and exterior sections of the engine to ensure clean mating surfaces and …
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THE RESULT The entire repair was completed inside of 5 days onsite inclusive of waiting and staging. Both sets of slip rings were machined to a surface finish of 1.0Ra in accordance with the manufacturer’s specifications and the turbine generator …
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PROJECT FACTS Description: MAN B&W HUYNDAI 7L23/30H Location: Portugal – US (under voyage)
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