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Our American Correspondent discusses

Our American Correspondent discusses claimed and this seems to be borne out in a brief Ou r American Correspondent sampling of the users. The manufacturers of seals have much to say on discusses — the subject of high operating temperatures. The director of research of one of the largest suppliers, states that these conditions are being overcome up to the point of 500°F. by the use of a material HIGH TEMPERATURE marketed under the trade name of "Teflon"—or in some cases a metal bellows is practicable. In extreme cases a hole is bored in the seal from the O.D. to LUBRICATION center where another hole is bored to the face—a constant stream of lubricant is pumped from a seal I N SEARCH OF INFORMATION REGARDING pump, the lubricant also serving as a cooling agent. this subject the seeker is confronted by conflicting The processors of petroleum lubricants are in opinions and the nomenclature of the several agreement that approximately 325°F. is the top professions encountered. This is not an attempt to range for mineral oil and that the silicone products, evaluate the different theories advanced but to report when used as an additive raises the limit about one a summary of the various opinions offered. hundred degrees. Many claims have been made through various The manufacture of application devices also play announcements of lubricants (generally in semi-solid an important part in high temperature lubrication. form) that will withstand temperatures up to 800°F. A circulating system often is piped through water Apparently these statements are based on laboratory coils to bring down the temperature of the used oil. performance. There are few industrial applications In extreme cases, a refrigeration unit is hooked to where these extreme head conditions prevail. the line to lower extremes of temperature. The cycle The great advances in machine design coupled with of automatic lubricators is stepped up to apply a water cooling of the heat dispensing parts leading to smaller charge with greater frequency. In cases the bearings, provide nearly normal bearing temper­ where grease is used the used grease or residue is atures. The lubrication of chain carriers through eliminated by mechanical means. drying ovens where the traverse is of fifteen to Industrial applications for over 325°F are com­ twenty minutes duration in 400—475°F temperatures paratively few and these few generally can be reduced is now handled chiefly by frequency of application by mechanical means. Machine design is following rather than attempting to rely wholly on lubricant a pattern of constant improvement in which the selection. These oven chains that presented quite a metalurgist and physicist play an important part problem fifteen years ago can be operated smoothly since all factors affecting the efficient operation of today. the finished machine are taken into consideration. I t is said that a gellator has been developed that No longer does the crated mechanism wait for the retains its structure up to 450 and 500°F. but if forgotten oil holes to be bored with a breast drill. produced in commercial quantities the expense is Recently a prominent machine builder was asked almost prohibitive. Many of the executives of the to predict the forseeable advances in machine major lubricant producers circle widely around the construction. He replied, "If, fifteen years ago, subject of lubricant production for higher than 500°F someone had attempted to predict some of the temperatures. The main reason for this reticence things we are actually doing today, I should have apparently is the heavy expense involved in the called him a fool—I do not want to be called a fool." development work itself, inasmuch as the commercial There seems to be no limit set for improvements as demand is slight. Such high temperature lubricants this is the age of the scientist who has taken the place tha t wil l result will come from chemical combinations of the man with the tool box. Sometime ago a man used as additives with petroleum products or more high up in engineering circles said, "We are now likely in pure form. The U.S. Naval Laboratories working for the physicist." made a recent announcement of a newly developed lubricant that performed efficiently at 800°F. This All of these things have a bearing on high temper­ has been the subject of much discussion in lubrication ature lubrication by reducing the need. In those circles and the arguments have been in proportion extreme cases the continuing development in synth- to the importance of the subject to those engaged thetics are proving adequate for their requirements by and conflicting opinions from authoritative sources frequent lubrication. Some of the claims for the are current. efficiency of molybdenum disulphide at extreme temperatures, may or may not be fallacious. The There seems to be no doubt expressed that these opinions on this matter seem to have a wide variation. experiments have assumed practicable form ; the discussion centers on the type of the synthetic The quite plausible theory is being advanced that product used to achieve the result. The present cost the ultimate lubricant for high temperature bearings of approximately fifty dollars per pound would be will devolve upon the requirements that the fluid prohibitive for industrial use. portion of the lubricant will be lost and the gellator A company that specializes in the coating of bear­ would have lubricity qualities and be of a polar nature so as to plate out over the metal, thereby ings with a thin film of resin of the infusable type functioning as a true lubricant. This will probably (thereby diminishing the coefficient of friction) is originate from the chemical manufacturers. having considerable success. Longer bearing life is 30 Scientific LUBRICATION October, 1957 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

Our American Correspondent discusses

Industrial Lubrication and Tribology , Volume 9 (10): 1 – Oct 1, 1957
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/eb052481
Publisher site
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Abstract

claimed and this seems to be borne out in a brief Ou r American Correspondent sampling of the users. The manufacturers of seals have much to say on discusses — the subject of high operating temperatures. The director of research of one of the largest suppliers, states that these conditions are being overcome up to the point of 500°F. by the use of a material HIGH TEMPERATURE marketed under the trade name of "Teflon"—or in some cases a metal bellows is practicable. In extreme cases a hole is bored in the seal from the O.D. to LUBRICATION center where another hole is bored to the face—a constant stream of lubricant is pumped from a seal I N SEARCH OF INFORMATION REGARDING pump, the lubricant also serving as a cooling agent. this subject the seeker is confronted by conflicting The processors of petroleum lubricants are in opinions and the nomenclature of the several agreement that approximately 325°F. is the top professions encountered. This is not an attempt to range for mineral oil and that the silicone products, evaluate the different theories advanced but to report when used as an additive raises the limit about one a summary of the various opinions offered. hundred degrees. Many claims have been made through various The manufacture of application devices also play announcements of lubricants (generally in semi-solid an important part in high temperature lubrication. form) that will withstand temperatures up to 800°F. A circulating system often is piped through water Apparently these statements are based on laboratory coils to bring down the temperature of the used oil. performance. There are few industrial applications In extreme cases, a refrigeration unit is hooked to where these extreme head conditions prevail. the line to lower extremes of temperature. The cycle The great advances in machine design coupled with of automatic lubricators is stepped up to apply a water cooling of the heat dispensing parts leading to smaller charge with greater frequency. In cases the bearings, provide nearly normal bearing temper­ where grease is used the used grease or residue is atures. The lubrication of chain carriers through eliminated by mechanical means. drying ovens where the traverse is of fifteen to Industrial applications for over 325°F are com­ twenty minutes duration in 400—475°F temperatures paratively few and these few generally can be reduced is now handled chiefly by frequency of application by mechanical means. Machine design is following rather than attempting to rely wholly on lubricant a pattern of constant improvement in which the selection. These oven chains that presented quite a metalurgist and physicist play an important part problem fifteen years ago can be operated smoothly since all factors affecting the efficient operation of today. the finished machine are taken into consideration. I t is said that a gellator has been developed that No longer does the crated mechanism wait for the retains its structure up to 450 and 500°F. but if forgotten oil holes to be bored with a breast drill. produced in commercial quantities the expense is Recently a prominent machine builder was asked almost prohibitive. Many of the executives of the to predict the forseeable advances in machine major lubricant producers circle widely around the construction. He replied, "If, fifteen years ago, subject of lubricant production for higher than 500°F someone had attempted to predict some of the temperatures. The main reason for this reticence things we are actually doing today, I should have apparently is the heavy expense involved in the called him a fool—I do not want to be called a fool." development work itself, inasmuch as the commercial There seems to be no limit set for improvements as demand is slight. Such high temperature lubricants this is the age of the scientist who has taken the place tha t wil l result will come from chemical combinations of the man with the tool box. Sometime ago a man used as additives with petroleum products or more high up in engineering circles said, "We are now likely in pure form. The U.S. Naval Laboratories working for the physicist." made a recent announcement of a newly developed lubricant that performed efficiently at 800°F. This All of these things have a bearing on high temper­ has been the subject of much discussion in lubrication ature lubrication by reducing the need. In those circles and the arguments have been in proportion extreme cases the continuing development in synth- to the importance of the subject to those engaged thetics are proving adequate for their requirements by and conflicting opinions from authoritative sources frequent lubrication. Some of the claims for the are current. efficiency of molybdenum disulphide at extreme temperatures, may or may not be fallacious. The There seems to be no doubt expressed that these opinions on this matter seem to have a wide variation. experiments have assumed practicable form ; the discussion centers on the type of the synthetic The quite plausible theory is being advanced that product used to achieve the result. The present cost the ultimate lubricant for high temperature bearings of approximately fifty dollars per pound would be will devolve upon the requirements that the fluid prohibitive for industrial use. portion of the lubricant will be lost and the gellator A company that specializes in the coating of bear­ would have lubricity qualities and be of a polar nature so as to plate out over the metal, thereby ings with a thin film of resin of the infusable type functioning as a true lubricant. This will probably (thereby diminishing the coefficient of friction) is originate from the chemical manufacturers. having considerable success. Longer bearing life is 30 Scientific LUBRICATION October, 1957

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Industrial Lubrication and Tribology – Emerald Publishing

Published: Oct 1, 1957

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