Marine engine oil ingredients
The International Maritime Organisation’s (IMO) 2020 international convention was designed to reduce pollution from shipping. The focus of the convention was to reduce sulphur emissions from the main propulsion engines of marine vessels. Because most ships use fuel oil – which is high in sulphur – it has forced ship operators to modify either their engines (installing scrubbers) or modify their fuels.
Two-stroke marine diesels are the workhorses of the sea. Powering the majority of long-range container ships and bulk carriers, we have come to depend on their blend of low fuel costs and economy to drive global trade.
As low sulphur fuel oil has become more available, most ship operators have chosen to use this, rather than go down the expensive route of installing scrubbers or converting to other fuel sources.
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Cylinder liner wear in two-stroke marine enginesCylinder liner wear has always been a topic of concern within two-stroke marine engines: whenever two surfaces slide over each other, friction is produced which leads to wear. Wear is expected in cylinder liners and regular maintenance is carried out as part of standard engine services. Factors that can affect wear include catalyst fines in fuels, the oil feed rate to the cylinder and oil specification, engine load, pressure, temperature and combustion efficiency.
The move to low sulphur fuels appears to have increased cylinder wear issues and many shipping companies are now reporting more and more serious incidences of adhesion and scuffing damaged, caused by the momentary welding of the piston rings to the cylinder liner. This damage requires additional maintenance, some of which may be unscheduled.
Costs to repair wear and damage
Significant costs are associated with cylinder liner wear and include the dry dock time, cylinder liner service and, in extreme cases, the complete replacement of a cylinder liner.
The cost to rectify this damage may exceed 1 million dollars for a large container ship and of course a premium is paid on top for unscheduled, emergency maintenance.
Using REWITEC™ surface repair additives to prevent and repair damage to marine cylinders
We offer a unique lubricant technology - a silicate lubricant additive with specific repair and protect effects for marine cylinder liners. REWITEC technology can repair damage and improve cylinder condition, removing cylinder glazing and restoring the cylinder liner surface.. We can reduce your overall maintenance costs and lost revenue by increasing uptime. This is a unique effect for a complex and critical issue in two-stroke marine engines. REWITEC can be added directly to the cylinder oil for two-stroke marine engines or we can provide custom products to your specifications.
REWITEC surface repair additives
Base oilsPolyalkylene glycol (PAG) and ester base oils
High-performing ester base oils and water soluble, insoluble and food contact approved PAG base oils for lubricant oil formulations.Read more
Friction modifiersPolymeric organic friction modifiers
High-performing polymeric organic friction modifiers for industrial gear oils, passenger car oils and heavy duty diesel engine oils.Read more
Viscosity and rheology modifiersFor catalyst washcoat manufacturing and lubricant formulation
High performance rheology and viscosity modifiers to optimise catalysts and catalytic converter production and increase oil or grease base oil viscosity.Read more