Page 53: of Maritime Reporter Magazine (January 2016)

applied to multiple situations including

Figure 4: Injection procedure riser bearings and bushes among others. with chocking material Alice Jucquois studied at the University of Lin-

The liner or bush should be aligned in coln, United Kingdom, and holds an MSc Degree in Marketing. Alice is part of Belzona Polymer- the housing. ics Ltd Marketing Department, where she is

The annular space between the bush responsible for the marketing strategy for the and the housing is sealed where re-

French speaking countries and development of quired to prevent loss of product during brand awareness through PR activities.

the injection process. This may be ac- complished by mechanical means or by utilizing a fast curing paste grade prod- uct. Injection holes should be carefully positioned together with vent holes to prevent the formation of air traps; ide- ally, injection points should be spaced

BY ALICE JUCQUOIS no more than 600 mm (24 inches) apart (? g. 3).

The selected material is loaded into to the highest injection point. Material is bung and injection should begin at the chocking material. This is indicated by disposable injection cartridges and in- injected until it is exuded from the next next hole. This process continues until leakage of material through small vent jected using pneumatic equipment. The highest injection point, at which time the annular space between the bush and holes drilled at the highest point avail- application progresses from the lowest the ? rst hole is sealed with a suitable the housing is completely ? lled with the able.

Case study

Belzona Bearing Installation in Oversized Bearing Housing n June 2010, a ship in a Bulgarian be reseated in the irregular bearing problem of galvanic corrosion between designed to provide erosion and corro- dockyard required installation of a housing. steel housings and rudder bushes, pin- sion resistance of metal surfaces, was

I new bronze bearing in an oversized Bonding the bush in place with Bel- tle cones and liners. done through ? exible hose placed into bearing housing. zona materials is a proven application It was proven to be a time and cost the four channels made in the back of

Predominantly, severe corrosion and in the marine industry. saving procedure in comparison with the bearing. impact wear had led to the destruction The use of Belzona composite ma- traditional repair, which would have Savings were made using this so- of the old bronze bearing and irregu- terials for installation of rudder bear- involved welding and boring. lution against expensive machining lar form of the housing leading to in- ings began in 1977 with collaboration Belzona’s injection method was cho- of the housing and supply of larger creased annular space between the new between Belzona and Germanischer sen as other alternatives would have in- bronze bush. manufactured bearing and the housing. Lloyd. curred longer downtime. The injection This standard repair procedure elimi-

As a result of this, a new bronze bush The project investigated the use of of Belzona 1321 (Ceramic S-Metal), a nates galvanic corrosion and provides bearing was manufactured and had to Belzona materials to eliminate the two-part ceramic ? lled epoxy material long term location of the bearing.

Picture 3: Bronze bearing machined and ready to be Picture 4:

Picture 5: Finished application after injection inserted in to the housing. Centralizing of the bearing in progress.

of Belzona 1321 www.marinelink.com 53

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