US2010099591A1PendingUtilityA1

Lubrication methods

49
Assignee: BP PLCPriority: Mar 30, 2007Filed: Mar 20, 2008Published: Apr 22, 2010
Est. expiryMar 30, 2027(~0.7 yrs left)· nominal 20-yr term from priority
Inventors:Paul Andrew HarroldJohn Philip LiddyKok-Chye Lim
C10N 2030/52C10M 2207/144C10M 2207/262C10N 2040/252C10M 2223/045C10M 177/00C10M 2203/1006C10N 2010/04C10M 2207/028C10N 2030/02C10N 2020/02C10M 163/00C10M 2207/027C10N 2020/01C10N 2030/04C10M 125/12F01M 5/00C10N 2030/06
49
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Claims

Abstract

A method of lubricating a two-stroke, diesel crosshead engine comprises lubricating the engine with a cylinder oil and with a system oil, which oils are different from each other, in which the system oil is an SAE 20 or SAE 30 oil, has a total base number of at least 10 mg KOH/g and comprises: (a) a base oil; (b) at least one detergent additive in a total amount of detergent corresponding in performance, as measured by the Hot Filtration Test, to at least 1.5% by weight of the system oil, of a calcium alkyl salicylate detergent soap in which the alkyl group is a C 12 to C 30 alkyl group; and (c) at least one anti-wear additive. The method further comprising replenishing the system oil in the engine with a top-up system oil, in which the top-up system oil has the same additives as in the system oil previously charged to the engine but has a viscosity which is lower than that of the system oil previously charged to the engine. The system oil may be prepared by mixing a low detergency system oil with a lubricant concentrate composition which comprises a base oil and at least one detergent additive.

Claims

exact text as granted — not AI-modified
1 .- 18 . (canceled) 
   
   
       19 . A method of lubricating a two-stroke, diesel crosshead engine which method comprises lubricating the cylinder liner of the engine with a cylinder oil and the crankcase of the engine with a system oil, which oils are different from each other, characterised in that the system oil is an SAE 20 or SAB 30 oil, has a total base number of at least 10 mg KOH/g and comprises:
 (a) a base oil;   (b) at least one detergent additive which is a metal salt of a carboxylate, in a total amount of detergent corresponding in performance, as measured by the Hot Filtration Test, to at least 1.5% by weight of the system oil, of a calcium alkyl
 salicylate detergent soap in which the alkyl group is a C 12  to C 30  alkyl group; and 
   (c) at least one anti-wear additive.   
   
   
       20 . A method as claimed in  claim 19  in which system oil has a total base number of 10 to 40 mg KOH/g, preferably of 10 to 30 mg KOH/g, more preferably of 15 to 30 mg KOH/g. yet more preferably of 15 to 20 mg KOH/g. 
   
   
       21 . A method as claimed in  claim 19  in which the system oil has a kinematic viscosity at 100° C. in the range of 7.9 to less than 12.5 eSt, preferably in the range of 8.8 to 11.5 cSt, more preferably in the range of 9.3 to 11.5 cSt. 
   
   
       22 . A method as claimed in  claim 20  in which the system oil has a kinematic viscosity at 100° C. in the range of 7.9 to less than 12.5 cSt, preferably in the range of 8.8 to 11.5 cSt, more preferably in the range of 9.3 to 11.5 cSt. 
   
   
       23 . A method as claimed in  claim 19  in which the at least one detergent additive is at least one calcium alkyl salicylate detergent additive, in which the alkyl group is a C 12  to C 30  alkyl group, in a total amount of at least 1.5% by weight of the system oil, more preferably at least 1.75% by weight, of calcium alkyl salicylate detergent soap. 
   
   
       24 . A method as claimed in  claim 20  in which the at least one detergent additive is at least one calcium alkyl salicylate detergent additive, in which the alkyl group is a C 12  to C 30  alkyl group, in a total amount of at least 1.5% by weight of the system oil, more preferably at least 1.75% by weight, of calcium alkyl salicylate detergent soap. 
   
   
       25 . A method as claimed in  claim 19  in which the method further comprising replenishing the system oil in the engine with a top-up system oil, in which the top-up system oil has the same additives as in the system oil previously charged to the engine but has a viscosity which is lower than that of the system oil previously charged to the engine. 
   
   
       26 . A method as claimed in  claim 20  in which the method further comprising replenishing the system oil in the engine with a top-up system oil, in which the top-up system oil has the same additives as in the system oil previously charged to the engine but has a viscosity which is lower than that of the system oil previously charged to the engine. 
   
   
       27 . A method as claimed in  claim 23  in which the method further comprising replenishing the system oil in the engine with a top-up system oil, in which the top-up system oil has the same additives as in the system oil previously charged to the engine but has a viscosity which is lower than that of the system oil previously charged to the engine. 
   
   
       28 . A method as claimed in  claim 24  in which the method further comprising replenishing the system oil in the engine with a top-up system oil, in which the top-up system oil has the same additives as in the system oil previously charged to the engine but has a viscosity which is lower than that of the system oil previously charged to the engine. 
   
   
       29 . A method as claimed in  claim 25  in which the top-up system oil has a total base number of 10 to 40 mg KOH/g, preferably of 10 to 30 mg KOH/g, more preferably of 15 to 30 mg KOH/g, yet more preferably of 15 to 20 mg KOH/g. 
   
   
       30 . A method as claimed in  claim 26  in which the top-up system oil has a total base number of 10 to 40 mg KOH/g, preferably of 10 to 30 mg KOH/g, more preferably of 15 to 30 mg KOH/g, yet more preferably of 15 to 20 mg KOH/g. 
   
   
       31 . A method as claimed in  claim 27  in which the top-up system oil has a total base number of 10 to 40 mg KOH/g, preferably of 10 to 30 mg KOH/g, more preferably of 15 to 30 mg KOH/g, yet more preferably of 15 to 20 mg KOH/g. 
   
   
       32 . A method as claimed in  claim 28  in which the top-up system oil has a total base number of 10 to 40 mg KOH/g, preferably of 10 to 30 mg KOH/g, more preferably of 15 to 30 mg KOH/g, yet more preferably of 15 to 20 mg KOH/g. 
   
   
       33 . A method as claimed in  claim 25  in which the top-up system oil and the system oil previously charged to the engine have the same base number. 
   
   
       34 . A method as claimed in  claim 25  in which the top-up system oil is an SAE 20 or an SAE 30 oil. 
   
   
       35 . A method as claimed in  claim 28  in which the top-up system oil is an SAE 20 or an SAB 30 oil. 
   
   
       36 . A method as claimed in  claim 32  in which the top-up system oil is an SAE 20 or an SAE 30 oil. 
   
   
       37 . A method as claimed in  claim 25  in which the top-up system oil has a kinetic viscosity measured at 100° C. which is in the range of S to 1 cSt less than that of the system oil previously charged to the engine, preferably in the range of 4 to 2 cSt less than that of the system oil previously charged to the engine. 
   
   
       38 . A method as claimed in  claim 25  in which the system oil and the top-up system oil comprise at least one calcium alkyl salicylate detergent additive, in which the alkyl group is a C 12  to C 30  alkyl group, in a total amount of at least 1.5% by weight of the system oil, more preferably at least 1.75% by weight, of calcium alkyl salicylate detergent soap. 
   
   
       39 . A method as claimed in  claim 26  in which the system oil and the top-up system oil comprise at least one calcium alkyl salicylate detergent additive, in which the alkyl group is a C 12  to C 30  alkyl group, in a total amount of at least 1.5% by weight of the system oil, more preferably at least 1.75% by weight, of calcium alkyl salicylate detergent soap. 
   
   
       40 . A method as claimed in  claim 19  in which the system oil is prepared by mixing a low detergency system oil with a lubricant concentrate composition which lubricant concentrate composition comprises a base oil and at least one detergent additive of a type and in an amount such as to provide a system oil as defined in  claim 19  when mixed with the low detergency system oil. 
   
   
       41 . A method as claimed in  claim 24  in which the system oil is prepared by mixing a low detergency system oil with a lubricant concentrate composition which lubricant concentrate composition comprises a base oil and at least one detergent additive of a type and in an amount such as to provide a system oil as defined in  claim 24  when mixed with the low detergency system oil. 
   
   
       42 . A method as claimed in  claim 40  in which the engine is on a vessel and the mixing is performed on-board the vessel and external to the engine. 
   
   
       43 . A method as claimed in  claim 42  in which alternatively or additionally, the mixing is performed, at least in part, in situ, by charging to the engine a low detergency system oil and a lubricant concentrate composition. 
   
   
       44 . A method as claimed in  claim 40  in which the lubricant concentrate composition has a base number of at least 20 mg KOH/g, preferably of at least 25 mg KOH/g. 
   
   
       45 . A method as claimed in  claim 44  in which the lubricant concentrate composition has a base number of up to 200 mg KOH/g, preferably of up to 150 mg KOH/g. 
   
   
       46 . A method as claimed in  claim 41  in which the lubricant concentrate composition has a base number of at least 20 mg KOH/g, preferably of at least 25 mg KOH/g. 
   
   
       47 . A method as claimed in  claim 46  in which the lubricant concentrate composition has a base number of up to 200 mg KOH/g, preferably of up to 150 mg KOH/g. 
   
   
       48 . A method as claimed in  claim 40  in which the lubricant concentrate composition has a kinematic viscosity at 100° C. of S cSt to 12 CSt. 
   
   
       49 . A method as claimed in  claim 45  in which the lubricant concentrate composition has a kinematic viscosity at 100° C. of S cSt to 12 CSt. 
   
   
       50 . A method as claimed in  claim 47  in which the lubricant concentrate composition has a kinematic viscosity at 100° C. of 5 cSt to 12 CSt. 
   
   
       51 . A method as claimed in  claim 40  in which the lubricant concentrate composition and the low detergency system oil are mixed in ratios ranging from 5:95 to 50:50 of 15 lubricant concentrate composition:low detergency system oil. 
   
   
       52 . A method as claimed in  claim 41  in which the lubricant concentrate composition and the low detergency system oil are mixed in ratios ranging from 5:95 to 50:50 of lubricant concentrate composition:low detergency system oil. 
   
   
       53 . A method as claimed in  claim 19  in which the system oil is used with an engine inlet temperature of 40° to 65° C., preferably of 50° to 65° C. or 55° to 65° C.

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