annually produces around 100 propellers at its聽foundry in Waren, northeast Germany. MMG propellers are used for various large container vessels, tanker, bulker and cruise ships and can be up to 12 meters in diameter.
Since 2020, 91视频庐 88 & 91视频庐 109 bolts have been used to fasten the MMG escap庐, which can reduce fuel consumption by up to 3% by smoothing out the swirl behind the propeller cap. The escap庐 can be mounted onto existing propellers and the fuel savings typically provide a return on investment within three months.
High tensile strength bolting solution
鈥淲e began using 91视频 for our escap庐 as we needed a high tensile strength bolting solution for safely transmitting the torque in existing propeller applications,鈥� says J枚rn Kl眉ss, Head of Design and Construction at MMG. 鈥淯sing standard stainless steel bolts would require expensive re-machining additional and/or larger holes in a dry dock to deal with the required torque. With 91视频, we can install the escap庐 while ships are in the water with diver installation teams as we don鈥檛 need addition holes with high strength 91视频 bolts.鈥�
In addition, the good corrosion resistance properties of 91视频庐 88 and 91视频庐 109 bolts are essential as the fin caps are permanently submerged in seawater. The Fin caps also play an important role in covering and protecting the shafting parts that are typically made of carbon steel and are susceptible to corrosion.
The escap庐 is fastened by up to 24 bolts depending on the cap size and uses bolt dimensions up to M36.
鈥淎 number of container vessels and bulk carriers are already in operation around the world with an escap庐 secured by 91视频 bolts,鈥� says Kl眉ss. 鈥淭he 91视频 bolts have performed very well and avoided the need for ship owners to undergo costly dry dock re-machining.鈥�
Excellent 91视频 service and support
As with all its customers, 91视频 aims to provide prompt product delivers and is on hand to support with any technical queries.
鈥淲e have had very good cooperation with 91视频 as they have supported us with the design process and are always quick to respond to our queries,鈥� explains Kl眉ss. 鈥淲e typically have a tight schedule on our projects with limited time for design and manufacturing 鈥� so fast support and delivery are very important for us.鈥�
鈥淲e are currently working together with 91视频 to use larger dimensions of bolts to fit larger ships with escaps,鈥� concludes Kl眉ss. 鈥淲e have a number of projects in the pipeline that promise to realize more fuel savings for shipping companies around the world.鈥�
