![]() It is an invaluable tool in comparing lubricants. This chart enables the full viscosity profile of the lubricants to be observed and compared. ![]() Table 1 presents a summary of the lubricants.Ī viscosity index chart is used to compare the possible alternative lubricants to the originally specified lubricant. According to the product data sheet, Ultra Gear 320 has viscosity of 320 cSt at 40☌, and 24 cSt at 100☌. Ultra Gear 320 is a mineral oil containing a borate extreme pressure additive package, and it is currently being used in a different gearbox nearby. According to the product data sheet, HiPerSyn 150 has viscosity of 143 cSt at 40☌, and 18.3 cSt at 100☌. To reduce the variability, 18 cSt was used as the viscosity at 100☌.Īs stated above, HiPerSyn 150, a synthetic base oil, was recommended to the client. Using ASTM D2161, it was determined that 85 to 95 SUS at 210☏ is equivalent to 17 to 19 cSt at 210☏. This information is based on articles from that time period. It was determined that the viscosity index of a 1965 naphthenic could have varied from -30 to 70. The original lubricant specified was a 1965 naphthenic base oil with viscosity of 85 to 95 SUS at 210☏. This would also reduce the possibility of cross-contamination. The client would like to use Ultra Gear 320 to consolidate lubricants. HiPerSyn 150 matches the 85 to 95 SUS at 201☏, and from this standpoint it appears to be a good match.Īnother gearbox in the same system is using Ultra Gear 320. HiPerSyn 150 was previously recommended to the client from another source. Oils containing sulfur and phosphorus additive should not be used. The brass components in the gearbox require a noncorrosive lubricant. The possibility of water contamination is low therefore oils that are sensitive to water contamination can be used. The average operating temperature of the gearbox is estimated to be 60☌ to 70☌. Naphthenic base oils have changed over time and it is important to note that this piece of equipment was built in 1965. The OEM recommended “naphthenic base oil with a viscosity of 85 to 95 SUS at 210☏”. ![]() The unit of concern is a right angle gearbox containing brass components. The client wanted a high-quality mineral or synthetic oil to protect its asset. The original lubricant suggested by the manufacturer was vague and specified a naphthenic mineral oil. A client recently contacted Noria wanting to identify an alternative lubricant for an older piece of equipment.
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