Maintenance and Testing of Protective Devices

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Mots clés : Equipment;Maintenance;Testing;Protective devices;Safety;Electrical equipment;Circuit breakers
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Publication: CIM Bulletin
Auteur(s): G. E. Wood, A. B. T. Werner, A. Azis
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: All machines vibrate and make noise. An increase signals impending trouble. Vibration and noise analysis allows the condition of the machine to be determined without costly interruption in service for dis-assembly and physical inspection.
Publication: CIM Bulletin
Auteur(s): James G. Lyons
Mots clés: Equipment, Maintenance, Machinery, Vibration, Noise analysis, Bearings, Shafts, Gears, Electrical equipment.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: Materials research and development has played an important role in the commercial success of the CANDU-PHW nuclear reactor and in the production of heavy water. Both capital investment and energy conservation demand very high component reliability in such systems. The interactions among reliability, plant performance and economics will be discussed in relation to materials research and development. Likely materials requirements for the nuclear industry over the next twenty-five years will...
Publication: CIM Bulletin
Auteur(s): E. C. W. Ferryman
Mots clés: Materials engineering, Nuclear power, Energy resources, Atomic energy, CANDU reactor, Power costs, Fuel cycles, Pickering, Heavy water, Bruce Plant.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: An historical background is presented to provide a basis for the lack of normally expected developmental effort over the first 20-25 years of viable zirconium production operations. This is followed by a description of developing technology, which is the result of years of research and piloting effort directed to the development of a more economical method to produce high-grade metallic zirconium. It is predicted that many of the process improvements described will have a significant impact...
Publication: CIM Bulletin
Auteur(s): D. R. Spink
Mots clés: Metallurgy, Extractive metallurgy, Zirconium, Hafnium, Fluid-bed reactors, Purification, Titanium, Reduction, Electrolysis.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: Ever since British Columbia started the ball rolling in 1974 with the introduction of its now-defunct Mineral Royalties Act, all Canada's resource-based provinces have significantly altered their mining tax systems. The last resource-based province to abandon its pre-1974. mining tax structure is New Brunswick, which introduced a new mining tax regime in the summer of 1977 to take effect from April 1, 1977. The new structure, which represents the outcome of considerable study and discussions...
Publication: CIM Bulletin
Auteur(s): R. D. Brown
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: The paper summarizes a slide presentation made during the CIM Mechanical-Electrical Operators' Conference, held at Sudbury, Ontario, January S5-S7, 1977. Its scope has been limited to a few specific aspects of modern Canadian hoisting plant practice that are likely to be of interest to operating personnel. It is intended to serve as a brief review of established methods, discuss in more detail the present state-of-the-art and suggest trends that will appear as products during the next few years.
Publication: CIM Bulletin
Auteur(s): P. deH. Eastcott
Mots clés: Equipment, Maintenance, Hoisting systems, Systems engineering, Friction hoists, Brakes, Ropes, Safety controllers, Control systems.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: Four conditions are commonly accepted as being needed for the development of native sulphur deposits in sedimentary rocks:
(1) ample sulphate-bearing evaporite, normally hydrostatic;
(2) proximity to petroleum deposits;
(3) a hydrodynamic system of communication between these two;
(4) a stratigraphic or structural trap to prevent escape of the sulphur and sulphur-bearing reaction products.
When any of these requisites are absent, apparently no significant residual bio-epigenetic sulphur...
Publication: CIM Bulletin
Auteur(s): V. F. Hollister
Mots clés: Sulphur, Industrial minerals, Sedimentary sulphur, British Columbia, Geochemistry, Stratigraphy.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: This paper concentrates on profits and other measures of return in the Canadian mining industry, especially in the non-mineral-fuels sector. The paper examines the historical patterns of mining profits, both before and after taxes, as compared with profits in other sectors of the Canadian economy, as well as some of the more important influences on mining profits. These include the prices of mineral products, provincial and federal tax policies with respect to mining, and the effect of...
Publication: CIM Bulletin
Auteur(s): Mitchell P. Rothman
Mots clés: Mineral economics, Rates of return, Mining industry, Profits, Taxation, Inflation, Prices, Cost indices.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: Individual mineral cyclone performance curves were determined for the four major minerals at two lead-zinc concentrators. Sizing was by screen and cyclosizer down to approximately 10 pm, with lead, zinc and iron assaying of each size fraction.
The performance curves were similar in shape and located according to the mineral specific gravity, pm. The curves displayed a discontinuity at the fine end and a magnitude of short-circuiting of fines to the underflow which increased with pm. Mass...
Publication: CIM Bulletin
Auteur(s): J. A. Finch, O. Matwijenko
Mots clés: Mineral processing, Grinding circuits, Cyclones, Lead, Zinc, Silica, Galena, Sullivan Concentrator, Pine Point Concentrator, Separation, Classification, Flotation, Ball mills.
Numéro: 787
Volume: 70
Année: 1977
Texte
Sommaire: Fatigue failure and accompanying brittle failure occurs frequently in heavy mining equipment. This paper discusses how fracture mechanics can be applied as a tool for crack control and crack management. Information is provided to determine if particular components are prone to brittle failure. By using existing fracture mechanics formula, an estimation of the critical crack size can then be made.
It is explained that for a successful application of fracture mechanics, both the actual...
Publication: CIM Bulletin
Auteur(s): H. W. Wevers
Mots clés: Equipment, Maintenance, Fracture mechanics, Mining equipment, Fatigue failure, Brittle failure, Steel, Trucks, Spindles, Shovels.
Numéro: 787
Volume: 70
Année: 1977
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