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- Höglund, Erik, et al.
(författare)
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Effect of pressurised gases on the viscosity of polyalkylene glycols
- 1997
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Ingår i: Wear. - 0043-1648 .- 1873-2577. ; 207:1-2, s. 24-28
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Tidskriftsartikel (refereegranskat)abstract
- Experiments have been conducted into the effect of pressurised hydrocarbons on the viscosity of a polyalkylene glycol. This lubricant is intended to be used in a sub-sea compressor/pump unit and the risk of diluting the lubricant by the surrounding natural gas, thus reducing the lubricant's viscosity, was to be investigated. Dilution can cause insufficient lubrication of the compressor's moving parts. A pressurised Höppler type viscometer was used for the tests which were conducted at 50 °C with a methane based hydrocarbon mixture and with pure nitrogen. The viscosity of the lubricant was reduced to 24% after 24 h exposure at 100 bar with the hydrocarbon mixture. A gas analysis was performed which indicates that the heavier hydrocarbons used are relatively soluble in the lubricant even at relatively low pressures. Nitrogen was found to have a very limited effect on the viscosity even if some was dissolved in the oil. A long duration test of 11 days was also made with nitrogen. This test did not show any significant reduction of the viscosity.
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- Lord, John, et al.
(författare)
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The Luleå ball and disc apparatus
- 2001
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Ingår i: Bench testing of industrial fluid lubrication and wear properties used in machinery applications. - West Conshohocken, Pa : ASTM International. - 0803128673 ; , s. 53-67
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Konferensbidrag (refereegranskat)abstract
- The ability to measure lubricant film thickness in elastohydrodynamic point contacts was greatly improved when the method of interferometry was introduced in the late 1960s. Constant refinements of the technique have made it possible to measure the thickness of thin films with an accuracy of a few nanometers. In order to further develop the technique and provide a tool for advanced lubricant experiments, a Ball and Disc Apparatus was developed. The aim was to accomplish an apparatus with an open architecture for easy expansion and the ability to use several sub-methods for film thickness determination.
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