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Browsing by Author "Sevenster, PG"

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Adsorption of water vapour by coal

Author: Bodenstein, L ; Sevenster, PG Date: 1964 The study of the behaviour of moisture on coal is a rather complex one. The moisture holding capacity of coal and the ability to absorb water affects many characteristics of the material. Read more
Aspects of the explosibility of coal macerals

Author: Sevenster, PG ; Meintjies, AA ; Van Den Berg, PJ Date: 1969 In continuing the investigation into the causes of the lesser susceptibility of South African coal dust to explosion, attention has been given to the relationship between the petrographic of coals and their explosibility. Read more
A contribution to the study of the heat effects of the adsorption of water by coal

Author: Sevenster, PG Date: 1963 The influence of moisture on the course of the oxidation or spontaneous heating of coal has been widely discussed in the literature but few authors have been drawn definite conclusions regarding the nature and extent of such an influence. Read more
A device for measuring the strength of small particles

Author: Sevenster, PG Date: 1964 In this study of the physical properties of an inherently brittle material such as coal it is of interest to determine the effect of certain physical properties (such as porosity) on the strength of the substance. Read more
Diffusion of gases through coal

Author: Sevenster, PG Date: 1958 It was found necessary to conduct the investigation described in this paper when information on diffusion coefficients of some strongly adsorbed gases was required in the course of other studies on coal at the Institute. Read more
Explosion hazards advisory committee research programme for 1970

Author: Sevenster, PG Date: 1969 In planning research projects in connection with coal dust explosion hazards, it must be borne in mind that explosions take place in tow stages, viz. Read more
A gas analysis apparatus: based on a gas chromatographic and chemical principles

Author: Sevenster, PG Date: 1957 The control of the operation of many processes depends largely on the control of the composition of gas mixture either used as starting materials for or appearing as products of the reaction. Read more
Interim report on the development of a new method for the determination of the methane content of coal

Author: Sevenster, PG ; Steenkamp, JH Date: 1967 In this report an account is given of a new technique developed at the Fuel Research Institute whereby the methane evolved from a coal sample is automatically measured and analyzed. The method utilizes a gas detector of high sensitivity to ... Read more
Interim report on the effect of adsorbed methane on the explosibility of coal dust

Author: Sevenster, PG ; Joubert, JH Date: 1967 One of the research projects undertaken to establish the cause of the apparent inactivity of South African coal dusts when subjected to the explosibility tests designed by the U.S.B.M. was to study the influence of methane content of the coal ... Read more
A micro volumetric gas adsorption apparatus

Author: Sevenster, PG Date: 1967 The studies concerning the weathering of sandstones shales and minerals associated with coal it is necessary to investigate the affinity that these substances have for atmospheric and water vapour. Read more
Note on the effect of variation in humidity conditions on the strength characteristics of coal

Author: Sevenster, PG ; Geldenhuis, CJ Date: 1964 The purpose of this investigation was to assess the suitability of a simple strength test in the study of the effects if climatic conditions on the breaking characteristics of South African coals. Read more
Notes on dispersibility of coal dusts

Author: Meyering, MC ; Fourie, PJ ; Sevenster, PG Date: 1969 The initial event in a coal dust explosion is the creation of a localized air blast, which is generally caused by a methane explosion. Read more
The oxygen absorption characteristics of South African coals

Author: Sevenster, PG Date: 1951 The primary objective of the present investigation was to ascertain the oxygen absorption characteristics of South African coals using a technique based on that developed by Winmill. Read more
A simple automatic toepler pump

Author: Sevenster, PG ; Fourie, PJ Date: 1962 This document is a report investigating the automatic Toepler pump. Read more
Studies on the interaction of oxygen with coal in the temperature range 0 degree to 9 degrees Celcius. Part I

Author: Sevenster, PG Date: 1958 The experimental conditions in such investigations were usually chosen to stimulate those encountered in practice and generally do not lend themselves to the study of the fundamental processes involved in the absorption of gasses and vapors ... Read more
A study of some aspects of the scaling of coal in the workings of South African collieries progress report on coal Mining Research at the Fuel Research Institute

Author: Sevenster, PG ; Meintjies, A Date: 1964 This paper is concerned with a different type of coal degradation which occur not only in coal already broken from the seam but is also noted on exposed faced in the workings of collieries where it may cause dangerous working conditions. Read more

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