There are many applications for laser measurement at a shipyard, such as when building new ships, repairing damaged ones and for regular maintenance. With the SMM exhibition coming up we thought it would be a good idea to tell you more about our solutions for this sector.
The importance of shaft alignment
Achieving a satisfactory shaft alignment is paramount for the safe and reliable operation of a ship during its lifetime. An unexpected shafting system problem, for example, failure of a stern tube bearing due to misalignment, leading to an emergency dry-docking and consequent loss of availability, can cost well in excess of $250,000 per incident for a small vessel. More serious problems, for example, involving a bent shaft and replacement for a larger vessel, can cost in excess of $1 million. [Source: Royal Belgian Institute of Marine Engineers]
Laser shaft alignment of propeller drive line.
Alignment of the propeller shaft and the gearbox is carried out with shaft alignment equipment like for example Easy-Laser® E710, with measuring units mounted on either side of the coupling. Large shafts and couplings can sometimes be difficult to rotate. Then a laser system like this with the possibility to calculate the alignment values with the need of just a small rotation like 40° is very useful.
Another example of what you can do with Easy-Laser is to check bearing play.
Read more about that in this interesting article.
Line bore applications
The alignment of bearing journals in relation to the stern tube (or gearbox) is carried out using a laser transmitter mounted on the axial surface at one end of the stern tube (or the gearbox flange) and a detector unit placed in the bearing position. The straightness of the stern tube itself is measured with a self centering bracket (pictured below). Many large manufacturers of diesel engines also use our bore alignment systems to measure the bearing journals of the engine.
Measurement of stern tube straightness with self centering bracket.
Harbours and ships sometimes have swivelling cranes. For these to work problem free, the bearing has to be flat. When measuring the flatness of a slewing ring bearing for a crane, a separate laser transmitter like the Easy-Laser D22 is used. The transmitter is secured to the flange with its magnets, and the detector is placed on assigned points at the bearing. The system automatically calculates best-fit results for optimum adjustments.
Flatness measurement is carried out e.g. on crane slewing bearings.
Easy-Laser® have an extensive knowledge within measurement and alignment for the shipping industry. We have developed alignment systems for single bearing drive lines, and customer adapted solutions for drive lines with rubber lined bearings. Other applications suitable for our laser systems is alignment of rudder bearings and water jet installations.
Come talk to us at SMM about your measurement and alignment needs! You find us in stand A3.414.
The exhibition is open 4-7 September.