- Email: [email protected]
Mechanical seals
Imperial Chemical Industries Ltd, Plastics Division B e s s e m e r Road, Welwyn Garden City, H e f t s 'Fluon' ptfe for use as an additive or dry lubricant filler. The Irmmides Lubricants Lid, Shield Street, Stockport Range of industrial lubricants specialtsing in the steel rolling industry. L e - C a s Lid, 192 Warrington Read, Penketh, Warrington, Lanes Lubricant dispensing equipment including a new emulsion cutting oil dispenser. Lincoln Engineering International NV, Kostverlorenweg ~ , Soest, Ho!ls.m4 Lubrication equipment and centralized lubrication systems. Mlcropure Ltd, 346-348 Cricklewood Lane, Loadoa NW2 Dry lubricant powers including exotic m a t e r i a l s and custom formulated v a r i e t i e s available in various f o r m s (eg aerosols, suspensions). Ministry of Technology, MJHbank Tower, MIlU,mnk London SWl Stands representing the three Industrial Units of Tribology and the National Engineering Laboratory. CH. J. Neuman Lift, 445 Brighto~ Road, Croydon, Surrey Manual lubrication equipment ranging from bucket lubricaiiors to hand pumps. Norgren Machine Lubrication Division of C. A. Norgren Ltd, Shtpston-on-Stour, Warwickshire Micro-fog lubrication system.
Pergamon P r e s s Ltd, Headtn~on Hill Hal/, Oxford OX30BW Technical publications Portapack Lid, 129a London Road, Be~htt!-on-Sea, Sussex Oil and grease handling equipment including maintenance trolleys. Powell and Company, Burry Port, Carms, South Wales Handling equipment and a c c e s s o r i e s for 40//50 gallon (180// 230 titre) drums. Rank P r e c i s i o n Industries Ltd, L e i c e s t e r House, Lee Circle, L e i c e s t e r LE1 9JB Taylor-Hobson metroiogy instruments including new lowcost roundness measuring device. Rellumit Lid, 6 David Road, Poyle Estate, Colnbrook, Bucks Filtration equipment. Sflverson Machine Ltd, Waterside, C h e f = m , Bucks Batch and in-line multi-purpose mixer emulsifiers. Step Industrial Equipment Ltd, Lower Kings Road, Berkhampstead, Herts Agents for Wanner plant lubrication equipment Tecalemit (Engineering) Lid, Plymouth, Devon Lubrication equipment from grease-guns to fully centralized systems. Vactric Control Equipment Ltd, Garth Road, Mordee, Surrey Early failure detection systems; magnetic chip detectors and oil analysis. Yokes Lid, Healey Park, Guildford, Surrey Full range of liquid filters.
BOOK REVIEWS
Mechanical seals E. Mayer (English translation edited by B. S. Nau) Iliffe Books (1969) 206 pp, £3 10s Od This is an English translation of a book which h a s already gone to three editions in the original German since it was first published in 1963. As far as I am aware it is the only book of its kind in the English language and as such, fills an important need. The translation is adequate and follows the original closely; the particularly difficult problem of converting the many graphs into units easily understood by Engitsh speaking engineers, has been well solved. The book deals comprehensively with many of the problems which are met by designer9 and u s e r s of mechanical seals. Subjects such as distortion under p r e s s u r e , wear of the coacting seal faces and leakage, a r e dealt with at great lengih and from a practical point of view there is a wealth of information in these chapters. Unfortunately, control of the most vital p a r a m e t e r in seal design, namely, the thickness of the fluid film which f o r m s between the rubbing faces, has not yet been reduced to mathematical precision either by the present author or, for that matter, by anyone else. Thus, whilst the book gives a great deal of information on practical aspects, it does not help the designer to bring his work to the level of that which is achieved in bearing design. There is still apparently more art than science in arriving at the basic loads, dimensions and m a t e r i a l s for mechanical seals. On the other hand, students and the seal user will find a wealth of factual information which is of direct interest, ranging from descriptions of the simplest seals for use in everyday domestic equipment, to the most sophisticated a r rangements found in nuclear power plant. The r e s e a r c h worker too, even though well versed in his subject, will find 54
TRIBOLOGY February 1970
the bibliography of 161 r e f e r e n c e s partictdarly useful--more useful in fact than the author's own interpretation of some of the experimental work which he and others have c a r r i e d out. Mayer is satisfied that in most cases the lubrication regime is that of the boundary condition, but in this he is at variance with nearly all the workers who are currently carrying out r e s e a r c h in this field; they are quite satisfied that the lubrication is normally hydrodynamic. In spite of the gaps, this is for the most part an authoritative statement which will be regarded as the standard work in this subject for some y ear s to come. It will be consulted by a readership as wide as the usage of mechanical seals itself, but many individuals will be deterred by the price from parchasing their own copy. E. T. Jagger Models of failure L. B. Gertsbakh and Kh. B. Kordnoskiy Springer Verlag, translated from Russian by Scrtpta Technica Inc, USA (1969) 166 pp In discussing t h i s attractively produced work, the f i r s t point to make is that the title needs expl~Inln~ What the anchors mean by 'f ai l u r e' is some abstractly defined event which causes 'a d ev l at l o n i n the properties of a unit from the conditions t h a t i t must possess In the course of its use'. By 'unit', in this context, they mean any engineering system. By 'model' the authors mean 'statistical method c~ description'. So the book is in no way concerned with the physical nature of failures. It discusses wear, for example, as a p r o c e s s that has certain statistical properties, but it does not link these to the physical properties of solids.
Pergamon P r e s s Ltd, Headtn~on Hill Hal/, Oxford OX30BW Technical publications Portapack Lid, 129a London Road, Be~htt!-on-Sea, Sussex Oil and grease handling equipment including maintenance trolleys. Powell and Company, Burry Port, Carms, South Wales Handling equipment and a c c e s s o r i e s for 40//50 gallon (180// 230 titre) drums. Rank P r e c i s i o n Industries Ltd, L e i c e s t e r House, Lee Circle, L e i c e s t e r LE1 9JB Taylor-Hobson metroiogy instruments including new lowcost roundness measuring device. Rellumit Lid, 6 David Road, Poyle Estate, Colnbrook, Bucks Filtration equipment. Sflverson Machine Ltd, Waterside, C h e f = m , Bucks Batch and in-line multi-purpose mixer emulsifiers. Step Industrial Equipment Ltd, Lower Kings Road, Berkhampstead, Herts Agents for Wanner plant lubrication equipment Tecalemit (Engineering) Lid, Plymouth, Devon Lubrication equipment from grease-guns to fully centralized systems. Vactric Control Equipment Ltd, Garth Road, Mordee, Surrey Early failure detection systems; magnetic chip detectors and oil analysis. Yokes Lid, Healey Park, Guildford, Surrey Full range of liquid filters.
BOOK REVIEWS
Mechanical seals E. Mayer (English translation edited by B. S. Nau) Iliffe Books (1969) 206 pp, £3 10s Od This is an English translation of a book which h a s already gone to three editions in the original German since it was first published in 1963. As far as I am aware it is the only book of its kind in the English language and as such, fills an important need. The translation is adequate and follows the original closely; the particularly difficult problem of converting the many graphs into units easily understood by Engitsh speaking engineers, has been well solved. The book deals comprehensively with many of the problems which are met by designer9 and u s e r s of mechanical seals. Subjects such as distortion under p r e s s u r e , wear of the coacting seal faces and leakage, a r e dealt with at great lengih and from a practical point of view there is a wealth of information in these chapters. Unfortunately, control of the most vital p a r a m e t e r in seal design, namely, the thickness of the fluid film which f o r m s between the rubbing faces, has not yet been reduced to mathematical precision either by the present author or, for that matter, by anyone else. Thus, whilst the book gives a great deal of information on practical aspects, it does not help the designer to bring his work to the level of that which is achieved in bearing design. There is still apparently more art than science in arriving at the basic loads, dimensions and m a t e r i a l s for mechanical seals. On the other hand, students and the seal user will find a wealth of factual information which is of direct interest, ranging from descriptions of the simplest seals for use in everyday domestic equipment, to the most sophisticated a r rangements found in nuclear power plant. The r e s e a r c h worker too, even though well versed in his subject, will find 54
TRIBOLOGY February 1970
the bibliography of 161 r e f e r e n c e s partictdarly useful--more useful in fact than the author's own interpretation of some of the experimental work which he and others have c a r r i e d out. Mayer is satisfied that in most cases the lubrication regime is that of the boundary condition, but in this he is at variance with nearly all the workers who are currently carrying out r e s e a r c h in this field; they are quite satisfied that the lubrication is normally hydrodynamic. In spite of the gaps, this is for the most part an authoritative statement which will be regarded as the standard work in this subject for some y ear s to come. It will be consulted by a readership as wide as the usage of mechanical seals itself, but many individuals will be deterred by the price from parchasing their own copy. E. T. Jagger Models of failure L. B. Gertsbakh and Kh. B. Kordnoskiy Springer Verlag, translated from Russian by Scrtpta Technica Inc, USA (1969) 166 pp In discussing t h i s attractively produced work, the f i r s t point to make is that the title needs expl~Inln~ What the anchors mean by 'f ai l u r e' is some abstractly defined event which causes 'a d ev l at l o n i n the properties of a unit from the conditions t h a t i t must possess In the course of its use'. By 'unit', in this context, they mean any engineering system. By 'model' the authors mean 'statistical method c~ description'. So the book is in no way concerned with the physical nature of failures. It discusses wear, for example, as a p r o c e s s that has certain statistical properties, but it does not link these to the physical properties of solids.