PREVENTING LUBRICANTS FROM DESTROYING MICRO-ORGANISMS THERE are many well-known in The lubricant used is Dow stances in whic h a lubricant must be Coming's Molykote 44M silicone prevented from leaking from a grease which meets these require bearing, not merely just to prevent ments. waste but to prevent contamination The CeCa unit has potential fields or staining, e.g. in food factories which include the development of where it may drip on to edible industrial fermentations and studies products (in fact to ensure safety in on water pollution and effluent some cases food factories use disposal , which , in conjunctio n with lubricants that are harmless if eaten fundamental research on cell and just incase), or in textil e mill s where microbe growth, extends into the drips of oil would stain materials. field of disposal of cutting and A more exceptional case where oil lubricating oils after use. contamination must not occur has just come to our notice. This concerns a fermenter system deve loped by Gallenkamp of London in conjunction with Prof. S. J . Pirt of the Department of Microbiology at Queen Elizabeth College of the University of London. The system, called the CeCa, is a mobile unit in which micro-organisms live, eat and breed in a reaction vessel where the environment is critically controlled; pH , temperature, and dissolved oxygen levels are continuously indicated on scales and recorders. Two separate lubrication systems LUBRICATING Any ingress of lubricant would were designed by Denco Farval, the destro y or infect the micro one for the "right ascension" gear organisms. box and the other for the "declina tion " gearbox. A GIANT Stirrer The specially designed stirrer Oil tank up-side-down mechanism is based on a modified Technical problems encountered TELESCOPE wit h the declination gearbox lubri Porton-type impeller driven by a slip cation system concerned the oil motor, controlled electronically, in supply tank which is fixed to the conjunction with a tachometer. Stirring speed is indicated on a telescopic yoke and which can DRIVE SYSTEM direct-reading meter. The stirrer has rotate through an angle of about stainless steel bearings and the 200° and this at times is up-side- housing has lubricated glands. down . This meant that a conven tional pump suction would have Seals at top and bottom are THE Siding Spring Observatory in become exposed, drawing air and impregnated with the same grease New South Wales was opened by not lubricant. Denco Farval over as is used to lubricate the bearings Prince Charles last October and a and this ensures that air does not came this by fittin g the suction unit new giant optical telescope involved enter the reaction vessel and that through the horizontal centre of the some lubrication problems. expensive micro-organisms do not oil tank. The tank was constructed The telescopic drive system was wit h one end of glass to enable escape nor become infected. designed by Marconi Radar Systems instant checking of the oil level. The stirrer assembly is regularly Ltd of Leicester and manufactured Wit h this design, providing the oil sterilized in an autoclave, and the by Mitsubishi Heavy Industries level is correct, the pump suction lubricant must not thereby be under sub-contract to the Mitsubishi remains submerged whatever the affected by temperature; it must not Electronic Corporation of Osaka, attitude of the tank. suffer any change in properties. The Japan. The telescopic mounting lubricant must remain totall y inert to consultants were Freeman, Fox and The total weight of the telescope ensure a contaminant-free culture Partners of London. Lubrication is 350 tons and the main gear wheel environment; an incorrect grade equipment for the telescope was in the right-ascension gearbox is could make the complete system supplied by Denco Farval Ltd of 12 ft in diameter and takes 12 hours useless. Hereford. to turn through 180o. 26 INDUSTRIAL LUBRICATION AND TRIBOLOGY, January I February 1975
Industrial Lubrication and Tribology – Emerald Publishing
Published: Jan 1, 1975
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