best option is bonding. Due to the size of the bearing required, in this case bonding was the only option to choose. Belzona has vast experience bonding composite bearings, especially around rudder pintle areas on ships. After a trial ship application in 1979, the material was accepted as a permanent installation and used from new on all Germanisher Lloyd classed vessels. One of the first and perhaps most notable bearing bonding applications in service today was performed on a flagship liner, Queen Elizabeth 2. Bearing bonding is carried out by injecting the Belzona material between the bearing and the housing. Te Belzona shim takes up any ovality or housing wear, thus creating a durable barrier with 100% surface contact, electrically isolating the bearing. Tere are other adhesive products

available on the market, however due to the 40-year design life, Belzona was chosen due to impressive testing, case histories. Te company holds a certification for the products that are used in this process.

BEARINGS SPLIT INTO SECTIONS Te bearings were supplied in various sizes to match the columns and housings; some of the bearings reached 2.5m in diameter and 3m in length. As the sizes were so large, the bearings were split into sections. Tis meant that once the bearings were in place, the seams between each section would have to be dammed to stop the injected adhesive from leaking. Belzona 1321 (Ceramic S-Metal) was used as the adhesive to inject between the housings/columns and the bearings. As Belzona 1321 does not cure based on a high exotherm, unlike chocking compounds, the gap could be reduced between bearing and substrate. Tis reduction of product

Bearing bonding in action – to riser tube

quantity and application time ultimately saves on costs to all. Due to the scale of this application, specialised techniques were created by Belzona Asia Pacific staff and the application team were trained up on life-sized equipment. One of the new techniques adopted was the use of a nylon jacking bolt which doubled up as an injection port for the Belzona 1321. Tis saved on the amount of holes that needed to be drilled into the composite bearing. Belzona inspectors were present during the whole application in Geoje and ensured that the high standards were kept through use of QA/QC documentation. Tis LNG project is now nearing completion, scheduled to go in production towards the end of 2018/ beginning of 2019. Tis project has truly been a

testament to modern engineering and it will not be long before it commences its 40-year life, bringing much needed resources and infrastructure to the local and global community. l

Sections of the bearing

Bearing bonding in action – to housing 24

Peter Johnson is engineering services manager at Belzona.

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