9. Temperature must then be maintained below 100°F (above 32 cSt viscosity) to avoid bearing wear at the low speeds of five to 10 rpm for several hours when the shaft is placed on a turning gear during turbine warmup. Ball and Roller Bearing Engineering, p. 40-43, 1985. In other cases, grease or self-lubricating materials may reduce or even eliminate troublesome low-temperature problems. The recommended upper temperature limit is 200°C. J. Östensen. Pivoted-pad thrust bearings in large vertical motors and generators are limited to a maximum viscosity of about 2,000 cSt (approximately 20°F above the pour point of medium turbine oil). This heat transfer fluid is recommended for use in heat transfer fluid systems operating in the temperature range from 150°C (302°F) to 300°C (572° F). Primarily used in chemical industries and plastic processing applications. Globaltherm® L is a multi-purpose high performance benzyltoluene heat transfer fluid. Accordingly, they allow higher limiting viscosities (Table 1) and corresponding lower temperatures. Globaltherm® RP Heat transfer fluid is a heat transfer agent suitable for applications requiring single fluid heating and cooling including; oil and gas, heat recovery, plastics, polymers and styrene and chemical processing. The test bearing lubricated with the synthetic oils ran cooler than with mineral based oils. Globaltherm® Omnisol is suitable for use in parabolic trough applications requiring a low freeze point and low temperature pumpability. For a large industrial electric motor, for instance, a heavy turbine oil (ISO viscosity grade VG 68) calls for a low-temperature limit of 21°F for the 2,000 cSt machine's viscosity limit, as specified in Table 1. %PDF-1.5 Greases formulated with lower viscosity mineral oils in the range of 25 to 30 cSt at 40°C, for instance, allow operation to about 20°F lower temperature than standard industrial greases using 100 cSt oils. When viscosity increases to this limit, the friction driving the ring from the thickening oil on the upper surface of the shaft continues to overcome the increased drag in the lower oil bath. Therefore, if you require high temperature heat transfer, you need a heat transfer fluid with excellent thermal stability. A 20W-50 oil works well for aircraft engines, where 20W oil provides faster and easier starting in winter and its 50 viscosity protects the engine against metal-to-metal contact when the aircraft is operating under normal conditions. For large industrial oil circulating systems, about one foot/second is a common full-drain design velocity at a limiting low-temperature viscosity in the 40°F to 65°F range.3 Any higher viscosity accompanying lower temperatures endangers low oil feed along with oil backup and overflow in the drains. Do not exceed the recommended temperature limits of the oil. CRC Press, p. 404-412, 1997. The operating Omnistore MS-600 can safely withstand temperatures up to 600°C (1076°F), higher than most heat transfer media on the market today. Table 3. The no.1 choice for concentrated solar power and thermal electricity applications, PET and plastics production and chemical industries. The low-temperature limit for starting an oil- lubricated machine is often specified by the pour point of the oil. Not only does this heat transfer fluid have one of the highest flash points available it also contains a resilient blend of additives to ensure trouble-free service when managed correctly. Globaltherm® J Heat transfer fluid is a superior high performance, energy efficient heat transfer fluid suitable for use in all kinds of industrial processes. In a matter of minutes, this process can damage pump flow passages, bearings and seals. Globaltherm® Omnistore MS-600 is the high temperature heat transfer media for Concentrated Solar Power (CSP) and thermal electricity storage applications. Feed lines are typically designed for oil flow rates of five to 10 feet/second. endobj oils will have a steeper slope. Thermal fluid specialist Global Heat Transfer stocks and delivers a wide range of premium quality heat transfer fluids, including Marlotherm® LH. Pressure drop through oil filters at rated operating conditions is commonly in the five to 10 psi range. Oil rings are another possibility. <>>> 7. The eutectic mixture of diphenyl oxide and biphenylgives this heat transfer fluid flexibility to perform in both vapour and liquid phases. When considering applications involving bearings, gears and other machine elements, initial calculation of minimum oil film thickness may be needed to identify the minimum viscosity grade and type of lubricant to be used at the rated operating conditions. Industrial gearbox units are perhaps most tolerant of high viscosity in low temperatures, at the expense of higher power losses. While pour point establishes one low-temperature operating limit, other demanding requirements for low viscosity appear in critical machinery and lube system flow areas such as suction and drain piping, pumps and filters. Globaltherm® HF heat transfer fluid delivers superior resistance to extreme oxidation and sludging found in many manufacturing environments, including plastics processing, molding, casting, asphalt, paint and chemicals. Conventional industrial greases made with mineral oils in the order of 100 cSt viscosity at 40°C (104°F) can be used down to -25°F to -30°F (where viscosity of the oil phase reaches about 100,000 cSt) in most industrial electric motors and other devices where moderate torque is available.7. Lindenkamp and Kleinlein 8 observed that after only one minute of ball bearing operation the torque dropped to only 30 to 60 percent of the starting torque.

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