Feature 1 | NN  N MNTNN


and is especially pleased to see a recovery in offshore vessel activity. Te company draws attention to the fact that it has worked on a significant number of offshore drillships in Asia, West Africa, Europe and the Americas over the past year, completing more than 35 engine overhauls. Tis has included work on Wärtsilä, STX-MAN, MaK and HiMSEN engines.


Tehnial oitent Upgrading technical capabilities is also high on Goltens’ agenda. Most notably, perhaps, it has been enhancing its metal stitching operations at different sites worldwide. According to Strand: “Although we have been doing these types of repairs for years, we have recently started using high resolution laser scanning to map the damaged areas, to aid in the design and casting of replacement inserts. We have now undertaken a number of large scale repairs using this method to salvage otherwise condemned blocks and


its crankshaft annealing procedure. The company has now successfully annealed around 270 crankpins on over 240 engines in 50 countries worldwide, involving engines manufactured by 18 different makers. “Te impact on customers’ cost avoidance and the minimisation of downtime through repairing instead of replacing is massive,” claims Strand. Crankshaft casualties often result in


o trand oltens orldwide hief oerating offier


bedplates in the marine, and other markets all over the world.” Although not a new initiative, having


secured class approval for the technique in 2012, Goltens reports growing demand for


extremely high hardness levels in the crankpin, and that hardness has to be removed or the shaft will have to be condemned and replaced. Traditionally the only option has been to try and machine below the area of hardness. Even if this is successful the large amount of material that generally has to be removed from the shaſt limits its expected lifespan. With annealing the amount of material machined off the crankshaſt is much less substantial, significantly increasing the life expectancy of the shaſt. SR


Effi cient corrosion protection using water jetting


Save time and money! Protect the environment! Achieve brilliant results!


DOCKMATE Semi-automatic surface preparation system. Range of blasting heads. Integrated vacuum system. Working height: up to 32 m


DOCKBOY Semi-automatic ship hull bottom, superstructure and deck preparation system. Integrated vacuum system. Working height: up to 9 m


SPIDERJET Stripping metal surfaces vertically, inclined, horizontally and overhead. Attaches by vacuum force. Working width: 374 mm


AQUAJET Diesel or electrically driven high pressure pump units. Op. pressures: up to 3000 bar Flow rates:


10 – 77 l/min Motor ratings: 170 – 500 kW


Hammelmann GmbH www.hammelmann.com


22


Carl-Zeiss-Straße 6–8 59302 Oelde • Germany


Tel. +49 (0) 25 22 / 760 mail@hammelmann.de


Online water jetting catalogue at: hammelmann.com/ship


Shiprepair & Maintenance 4th Quarter 2018


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