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Marine engine lubrication

a technology for marine engines and lubricating parts, applied in marine propulsion, vessel construction, propulsive elements, etc., can solve problems such as crankcase explosion, crack formation and propagation through the piston, and achieve the effect of improving asphaltene handling

Inactive Publication Date: 2012-02-02
INFINEUM INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention relates to a lubricating oil composition for use in a marine engine that improves the handling of asphaltenes (a type of oil-insoluble compound) when fuelled by heavy fuel oil. The composition contains a specific detergent and a hydrocarbyl-substituted carboxylic acid, anhydride, ester, or amide. When this composition is used in the engine, it reduces the formation of asphaltene deposits and improves engine performance. The invention also includes a method for operating the engine using this composition and a method for dispersing asphaltenes in the composition. The major components of the composition are a Group II basestock and a specific detergent. The composition has a high viscosity and contains a certain amount of calcium, phosphorus, sulphur, and sulphated ash. The invention also provides the product obtained by any reaction of the components.

Problems solved by technology

The presence of such carbonaceous deposits on a piston surface can act as an insulating layer which can result in the formation of cracks that then propagate through the piston.
If a crack travels through the piston, hot combustion gases can enter the crankcase, possibly resulting in a crankcase explosion.

Method used

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Examples

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examples

[0101]The present invention is illustrated by but in no way limited to the following examples.

Components

[0102]The following components were used:

Component (A):

[0103](A1) a calcium salicylate detergent having a TBN of 350 (basicity index of two or greater; a degree of carbonation of 80% or greater)[0104](A2) a calcium salicylate detergent having a TBN of 225 (basicity index of two or greater; a degree of carbonation of less than 80%)[0105](A3) a calcium salicylate detergent having a TBN of 65 (basicity index of less than two; a degree of carbonation of less than 80%)

Component (B):

[0106](B1) oleic acid[0107](B2) polyisobutene succinic acid derived from a polyisobutene having a number average weight of 450[0108](B3) a polyisobutene succinic anhydride (“PIBSA”) derived from a polyisobutene of number average molecular weight 950 (72% ai)[0109](B4) polyisobutene succinic anhydride (“PIBSA”) derived from polyisobutene having a number average molecular weight of 450 (75% ai)[0110](B5) iso-...

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Abstract

Trunk piston marine engine lubrication, when the engine is fueled by heavy fuel oil, is effected by a composition comprising a major amount of an oil of lubricating viscosity containing at least 50 mass % of a Group II basestock, and respective minor amounts of an overbased metal hydrocarbyl-substituted hydroxybenzoate detergent other than such a detergent having a basicity index of less than two and a degree of carbonation of 80% or greater and at least 1 mass % of a hydrocarbyl-substituted carboxylic acid, anhydride, ester or amide thereof. Asphaltene precipitation in the lubricant, caused by the presence of contaminant heavy fuel oil, is prevented or inhibited.

Description

FIELD OF THE INVENTION[0001]This invention relates to a trunk piston marine engine lubricating composition for a medium-speed four-stroke compression-ignited (diesel) marine engine and lubrication of such an engine.BACKGROUND OF THE INVENTION[0002]Marine trunk piston engines generally use Heavy Fuel Oil (‘HFO’) for offshore running. Heavy Fuel Oil is the heaviest fraction of petroleum distillate and comprises a complex mixture of molecules including up to 15% of asphaltenes, defined as the fraction of petroleum distillate that is insoluble in an excess of aliphatic hydrocarbon (e.g. heptane) but which is soluble in aromatic solvents (e.g. toluene). Asphaltenes can enter the engine lubricant as contaminants either via the cylinder or the fuel pumps and injectors, and asphaltene precipitation can then occur, manifested in ‘black paint’ or ‘black sludge’ in the engine. The presence of such carbonaceous deposits on a piston surface can act as an insulating layer which can result in the ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B63H21/38C10M159/20C10M129/26
CPCC10M169/045C10M2203/10C10N2240/102C10N2230/04C10N2210/02C10M2203/1006C10M2203/1025C10M2205/0285C10M2207/126C10M2207/127C10M2207/129C10M2207/262C10M2207/282C10M2215/08C10M2215/28C10M2219/089C10N2220/022C10N2030/04C10N2040/252C10N2010/04C10N2020/02C10M141/12C10M169/04
Inventor GARNER, TERENCEGREGORY, LAURAHARTLEY, JOSEPH PETERWATTS, PETER
Owner INFINEUM INT LTD
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