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Method for improving the air release of a lubricating oil in a hydraulic system

a hydraulic system and air release technology, applied in the petroleum industry, lubricant compositions, base materials, etc., can solve the problems of air entrainment, air entrainment, loss of lubricity, etc., and achieve the effect of improving air releas

Inactive Publication Date: 2018-11-22
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about improving air release in a lubricating oil. This is done by using a base oil that consists of more than 70% of GTL base oil. This results in better air release as compared to using a lubricating oil made with a base oil that has less than 70% GTL.

Problems solved by technology

These changes are leading to increased problems of air entrainment.
Air entrainment can have a number of negative consequences including loss of lubricity, possible oxidation of the lubricating oil, noisy operation, lower efficiency and higher oil temperatures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022]Eleven different base oil blends were prepared using combinations of three base oils:[0023]1) XHVI 8 (a Fischer-Tropsch derived oil available from Shell having a kinematic viscosity at 100° C. of approximately 8 cSt)[0024]2) Yubase 8 (a Group III base oil from SK Lubricants having a kinematic viscosity at 100° C. of approximately 8 cSt)[0025]3) Chevron 220 R (a Group II base oil from Chevron having a kinematic viscosity at 100° C. of approximately 8 cSt)

The air release time of the base oil blends was tested using the ASTM D3427 method at 50° C. Table 1 gives the amount of each base oil (in weight % based upon the total weight of the blend) present in each blend and the air release time at 50° C. The blends in Table 1 are all ISO 46.

TABLE 1Air releaseXHVIYubaseChevrontime at 50° C.88220 R(seconds)Blend 1100005Blend 2752505Blend 366.733.3030Blend 45050040Blend 52575060Blend 60100077Blend 70010061Blend 85005046Blend 9900105Blend 10800205Blend 117502515

[0026]The results show very ...

example 2

[0027]Air release times are typically considered to get worse with the addition of additives. To demonstrate that fully formulated hydraulic oils according to the invention are resistant to changes in air release, blends were prepared using XHVI 8 (a Fischer-Tropsch derived oil available from Shell having a viscosity at 100° C. of approximately 8 cSt) and different amounts of either of the following:

[0028]1) Additive Package 1 (ashless additive package)

[0029]2) Additive Package 2 (zinc based additive package)

Table 2 gives the blend compositions (in weight % based upon the total weight of the blend) for each of the additive packages with XHVI 8 and the corresponding air release times:

TABLE 2Air ReleaseAdditiveAdditiveXHVITime at 50° C.Package 1Package 28(seconds)Blend 1001005Blend 12109910Blend 132.5097.510Blend 14509510Blend 15019910Blend 16029810Blend 17039710Blend 18049610Blend 19059510Blend 200109010

[0030]The results show that the addition of additive packages (either ashless or ...

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Abstract

The invention provides a method for improving the air release of a lubricating oil in a hydraulic system, said method comprising supplying the lubricating oil to the hydraulic system. The air release is measured according to ASTM D3427.

Description

FIELD OF THE INVENTION[0001]The invention relates to a method for improving the air release of a lubricating oil in a hydraulic system.BACKGROUND OF THE INVENTION[0002]Lubricating oils are required in hydraulic systems to protect, lubricate and help transmit power. Current trends in the design of hydraulic systems are towards smaller reservoirs, low oil residence times and high power output. These changes are leading to increased problems of air entrainment. Air entrainment is a phenomenon wherein air bubbles (typically having a diameter of less than 1 mm) are dispersed throughout the lubricating oil. Entrained air can be distinguished from free air (a pocket of air trapped in part of the system), from dissolved air (lubricating oils may contain between 6 and 12 percent by volume of dissolved air) and from foam (air bubbles typically greater than 1 mm in diameter that congregate on the surface of the oil). Air entrainment can have a number of negative consequences including loss of ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M111/04C10M107/02C10M169/04
CPCC10M111/04C10M107/02C10M169/04C10M2205/173C10N2220/022C10N2230/02C10N2240/08C10M2203/10C10M2203/1006C10M2203/102C10M2203/1025C10N2020/02C10N2030/00C10N2030/02C10N2040/08
Inventor COLEMAN, ANNE TAYLORGULLAPALLI, SRAVANIKENSLER, JENNIFER LIN KARAM
Owner SHELL OIL CO