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Environmentally acceptable lubricants (EAL) in the maritime industry

Finnøy, Christer
Master thesis
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URI
http://hdl.handle.net/11250/2406352
Date
2016
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Abstract
All dynamic mechanical equipment needs lubrication to perform in a best possible way. In

the maritime industry, e.g. ships, many of the most important dynamic mechanical systems

are located beneath the surface of the sea. Examples of equipment are thrusters, stern tubes

and ship stabilizers. All these components are dependent on proper lubrication to perform

optimally and secure a long service-life. In the interface between the seawater moving parts, a

seal is required to separate the oil and seawater from each other. Due to new requirements,

conventional mineral oil shall be exchanged with an environmentally acceptable lubricant

(EAL).

In this study dierent elastomers were tested against dierent steels (S355-steel and NiCrsteel)

with two dierent oils (Shell Omala 68 and Kl uberbio EG 2-68). The motivation

for performing the tests was to identify the tribological properties of the elastomers in the

required EAL compared to the oil in use, and occurring mechanisms and the chemomechanical

eects of the lubricants in interaction with the seal. The testing was performed at lab

scale using a "Pin-on-plate" conguration in a tribomachine. To investigate the eect of

the lubricants on the elastomers two soaking tests were performed, and soaked samples were

tribologically evaluated.

The result from this study showed that the conventional mineral oil give the lowest coecient

of friction (COF) when comparing the two oils. When comparing the elastomers, NBR

showed a lower COF than FKM. It was concluded that all the elastomers are operating in

a boundary/mixed lubrication regime. NBR exhibit higher wear compared to FKM in most

situations, exceptions are when adding abrasive particles (Silicon Carbides) to the lubricant

and the contact pressure (CP) is low. Transfer of polymer from adhesive wear towards the

metal surface could be observed for all elastomers. The results from the soaking tests showed

that EAL degrade NBR more than conventional oil and that higher temperatures accelerate

the degradation. In the soaking test FKM gained mass from aging. This study gives pointers

of expected behaviour in the sealing system.
Publisher
NTNU

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