CEJN together with Jesper Bohn Rosendal at the Prime Serv academy
MAN Diesel & Turbo is the global market leader for large diesel engines for use on ships and in power stations, and is one of the three leading suppliers of turbo machines. This diesel engine giant is also a customer of CEJN. On 3rd May 2014, Roy Eriksson (Product Manager HP) and Ulrica Örnemar (Marketing Communicator) set off to visit MAN in Copenhagen for the purpose of learning more about the use of CEJN ultra high-pressure hydraulic products in a two-stroke engine context and further developing cooperation between the two companies.
CEJN meets up with Jesper Bohn Rosendal, Mechanical Engineer at MAN - a huge complex in central Copenhagen. After a chat we head off to the Prime Serv academy, a building housing a ship engine used to educate ship crew on how to operate and repair the MAN engines. The engine is a S35MC, which means it is the smallest model, with a cylinder diameter of 35 cm, yet with functionality more or less identical to the much larger models.
Training facility provides reality check
Having climbed the stairs to reach the top platform of this “small” engine, it feels high enough at 6,3 metres. It feels good actually: standing here, seeing the world through the eyes of a maintainance technician, ready to perform his task. Seeing the heavy parts combined with the confined space around the cylinder covers leads to an understanding of the need for smaller and more easy-to-handle tools. And this requirement for smaller tools consequently leads to a requirement for higher pressure.
The heavy task of engine repair
The process of dismantling an engine in order to repair it is an extremely complex task. In order to access the embedded parts, the maintainance technician first needs to uncover the cylinder. Bolt tensioning is used to release the bolts on the cylinder head, which is then removed using a crane. Secondly, the repairer needs to unscrew the bolts holding the crankshaft at the bottom of the engine. It is now possible to hoist up the connecting rod from the top. This is, of course, a simplification of the process. What is clear is that it is a time-consuming task that needs to be perfomed as quickly and safely as possible. Imagine doing this with equipment that is not trustworthy.
The use of CEJN components. When working with ultra high-pressure hydraulics, you need to work safely. An unintentional spurt of hydraulic oil under high-pressure is the last thing you want to see when working under such difficult conditions. MAN has been using CEJN couplings for more than 3 decades because they, just like CEJN, put safety first. “CEJN has always provided us with high-quality products”, says Jesper Bohn Rosendal.
1. Detachment of bolts holding rod and crankshaft together. 2. Roy on his way to fix the bolt tensioner on a tie bolt in one of the confined spaces. 3. Simultaneous depressuration of bolts using a T-block assembly, which could be replaced with a CEJN T-connection, series 116. 4. Cylinder heads with tie bolts running through the whole engine.