Modification of lubricant properties in an operating all loss lubricating system
AssigneeExxonMobil Research and Engineering Company
InventorsVincent Mark Carey, Kevin John Kelly, Kevin Louis Crouthamel, Keith Preston Saddler
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Abstract
A marine diesel engine system includes a diesel engine having a plurality of cylinders. The system also includes, proximate the engine, a primary engine lubricant and an additive selected from certain alkylamine-alkylphosphates, 500 TBN calcium sulfonate and mixtures thereof. A means for blending the lubricant and additives into a mixture for introduction into a cylinder is provided. Thus lubricant properties may be modified depending upon engine conditions.
Claims7
A marine diesel engine system comprising:
- a slow-speed cross head marine diesel engine with at least one cylinder;
- cylinder lubricant components proximate the engine, the components comprising:
- (i) a primary lubricant and (ii) an additive selected from the group consisting essentially of (i) an alkylamine-alkylphosphate having at least 1.25 equivalents of alkylamine to 1.0 equivalents of alkylphosphate and a nitrogen to phosphorous weight ratio of at least 0.5, (ii) 500 TBN calcium sulfonate, and (iii) mixtures thereof;
- and
- means for blending the primary lubricant and additive into a mixture for introduction into the cylinder when engine conditions require the mixture.
A method for lubricating one or more cylinders of a cross-head marine diesel engine based on the requirement for an enhanced wear and corrosion resistant lubricant comprising:
- measuring one or more engine condition parameters;
- calculating from the measured parameters each cylinder's requirement for an enhanced wear and corrosion resistant lubricant;
- and (i) when a cylinder does not require an enhanced lubricant, lubricating the engine cylinder with a primary engine lubricant (ii) and when a cylinder requires an enhanced lubricant, mixing the primary lubricant with an effective amount of an additive selected from the group consisting essentially of (i) alkylamine-alkylphosphate additive having at least 1.25 equivalents of alkylamine to 1.0 equivalents of alkylphosphate and a nitrogen to phosphorous weight ratio of at least 0.5, (ii) 500 TBN calcium sulfonate, and (iii) mixtures thereof;
- thereby forming a mixture;
- and lubricating the cylinder with the mixture.
A method for lubricating one or more cylinder's of a two stroke cross head marine engine comprising:
- lubricating the cylinder with a primary lubricant when combusting a fuels containing sulfur levels of about 0.5 wt % to 2.0 wt %;
- and
- lubricating the cylinder when combusting fuels containing sulfur levels greater than 2.0 wt % to about 5.0 wt % with a mixture of a primary lubricant and an additive selected from the group consisting essentially of (i) an alkylamine-alkylphosphate having at least 1.25 equivalents of alkylamine to 1.0 equivalents of alkylphosphate and a nitrogen to phosphorous weight ratio of at least 0.5, (ii) 500 TBN calcium sulfonate and (iii) mixtures thereof.
Dependencies are inferred from the claim text.