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Sunday, July 26, 2020 | History

2 edition of critique of the dust explosibility index found in the catalog.

critique of the dust explosibility index

Martin Hertzberg

critique of the dust explosibility index

an alternative for estimating explosion probabilities

by Martin Hertzberg

  • 19 Want to read
  • 5 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Pittsburgh, Pa .
Written in English

    Subjects:
  • Mine explosions.,
  • Mine dusts.

  • Edition Notes

    Bibliography: p. 22-24.

    Statementby M. Hertzberg.
    SeriesReport of investigations ;, 9095, Report of investigations (United States. Bureau of Mines) ;, 9095.
    Classifications
    LC ClassificationsTN23 .U43 no. 9095, TN313 .U43 no. 9095
    The Physical Object
    Pagination24 p. :
    Number of Pages24
    ID Numbers
    Open LibraryOL2493164M
    LC Control Number87600078

    The USBM quantified coal dust explosibility as a function of the maximum explosion pressure (P max), the maximum rate of pressure rise (dP/dt) max, and explosibility index . Determination. Explosibility is preferably determined in closed apparatuses according to the described methods. While the same ignition source is used in the 1 m 3 vessel as in the test to determine the characteristics p max and K St (E Z = 10 kJ), the ignition energy to determine dust explosibility in the 20 l sphere is only 1 kJ to 2 kJ.. If the described method produces no .

    Dust within these systems ignites easily, and creates a fire that is difficult to control and put out. Much like with removing the fuel from the explosion pentagon, having the facility professionally cleaned by people following NFPA combustible dust protocols is an essential step in preventing a . explosibility of the dust mixture. Details regarding the design and operation of the CDEM can be found in the reference by Sapko and Verakis (). of the CDEM, NIOSH researchers eight underground coal mines. While underground, NIOSH and MSHA inspectors used the CDEM to assess the explosibility of the dust samples.

      3 3. Calculation of Maximum Recommended Dust Layer Thickness NFPA4 focuses on dust in the wood working industry, Chapter 11 and Annex A, paragraph or NFPA , Chapter 5 are stipulating a dust layer thickness of more than 1/8” ( mm) is considered unsafe if the dust is covering a certain percentage of. mentofLabor OccupationalSafetyandHealthAdministration OSHA HazardCommunicationGuidancefor CombustibleDusts Occupational Safety and Health Act of.


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Critique of the dust explosibility index by Martin Hertzberg Download PDF EPUB FB2

@article{osti_, title = {Critique of the dust-explosibility index: an alternative for estimating explosion probabilities. Report of Investigations/}, author = {Hertzberg, M}, abstractNote = {The Bureau of Mines report proposes a new methodology for estimating industrial dust explosion hazards in terms of three probabilities or cofactors: The dispersion of the dust.

Get this from a library. A critique of the dust explosibility index: an alternative for estimating explosion probabilities.

[Martin Hertzberg]. A numerical measure of the explosion hazard potential of a dust as determined by multiplying the dust Ignition Sensitivity Index by its Explosion Severity Index. Books ; Process Safety Beacon Explosibility Index.

A Critique of the Dust Explosibility Index: An Alternative for Estimating Explosion Probabilities. Authors Hertzberg-M Source MISSING pages Link NIOSHTIC No.

Abstract This Bureau of Mines report proposes a new methodology for estimating industrial dust explosion hazards in terms of three probabilities or cofactors: the dispersion. The liter sphere is used to determine the Pmax (maximum explosion pressure), dP/dtmax (maximum rate of pressure rise), and KSt value (explosion index) of a dust cloud, as outlined in ASTM E, “Standard Test Method for Explosibility of Dust Clouds”.

A kJ igniter is used as the standard ignition source. The purpose of this test method is to provide standard test methods for characterizing the “explosibility” of dust clouds in two ways, first by determining if a dust is “explosible,” meaning a cloud of dust dispersed in air is capable of propagating a deflagration, which could cause a flash fire or explosion; or, if explosible.

Unfortunately, dust explosions are common and costly in a wide array of industries such as petrochemical, food, paper and pharmaceutical. It is imperative that practical and theoretical knowledge of the origin, development, prevention and mitigation of dust explosions is imparted to the responsible safety manager.

The material in this book offers an up to date. Explosibility of Metal Powders Murray Jacobson, Austin R. Cooper, John Nagy U.S. Department of the Interior, Bureau of Mines, - Dust explosions - 25 pages. The third non-traditional dust type to be explored in this review is hybrid mixtures, which can be any dust that also has an admixed gas or is wetted with an organic solvent.

These three categories of dust are less frequently the topic of dust explosion research, and so their explosibility behaviours are less well-documented. A critique of the dust explosibility index: an alternative for estimating explosion probabilities.

Published Date: This method or rationale is proposed as a replacement for the "explosibility index" that was first suggested 25 yr ago, but which, by consensus among leading researchers in the field, is now outdated. This report.

This article presents a dust explosion characteristics of commercial rice flour at different concentration and ignition time. The rice flour with a moisture content of % (undried) and a mean diameter of D 50 = μm was used in this work.

The moisture in the rice flour was further reduced by oven drying to % (dried) and both samples were tested for comparison. The current authors review the literature data for explosion of nontraditional dusts in the processing industry. Nanomaterials (solid materials with diameters from 1 nm to nm), fibrous particles (solid materials with one dimension being much larger than the other two), and hybrid mixtures of dusts and gases are explored.

Explosibility of Carbonaceous Dusts John Nagy, Henry G. Dorsett, Austin R. Cooper U.S. Department of the Interior, Bureau of Mines, - Dust explosions - 30 pages. In light of the above findings and given the need for a more definitive characterization of rock dust that is effective for inerting a propagating coal dust explosion, NIOSH researchers undertook an investigation of the rock dust particle size effects on explosibility in a L chamber.

Abstract. deals with the myth that dust explosions happen only in coal mines and grain elevators. The reality is that dust explosions occur in a wide range of industries and industrial applications involving numerous and varied products such as coal, grain, paper, foodstuffs, metals, rubber, pharmaceuticals, plastics, textiles, etc.

maximum values of the deflagration index when dust larger tha n the G., Eckhoff, R. K.,Review of the Explosibility of Ignition Energy of a Dust Could in air, Annual Book of ASTM. The explosibility results showedthat wood dust can be an explosi on hazard and that a small proportion of the dust samples collected in this project showed a explosible composition.

Itsimilar is important to highlight that based on the criteria applied to assess dust hazardthe vast majority (93%) of, the collected. where K St is the deflagration index for dust, (dP/dt) max is the maximum pressure increase rate during the explosion, and V is the volume of explosion development.

The cubic law for dust explosion basically states that for the same dust of identical concentration, the same deflagration index will be obtained regardless of the volume of the confined area.

Purchase Dust Explosions, Volume 4 - 1st Edition. Print Book & E-Book. ISBNEffect of rock dust on explosibility of coal dust (OCoLC) Online version: Richmond, J.K.

(James Kenneth). Effect of rock dust on explosibility of coal dust (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: J K Richmond; I Liebman; L F Miller.

This paper is an overview of and introduction to the subject of dust explosions. The purpose is to provide information on the explosibility and ignitability properties of dust clouds that can be used to improve safety in industries that generate, process, use, or transport combustible dusts.

The requirements for a dust explosion are: a.66 THE EXPLOSIBILITY OF DUSTS IN SMALL-SCALE TESTS AND LARGE-SCALE INDUSTRIAL PLANT By K.

N. PALMER, M.A.* and P. S. TONKIN* SYNOPSIS The established small-scale tests for determining the explosibility of combustible dust clouds in air are briefly.the dust particle size and shape are of primary impor­ tance in regard to dust explosibility characteristics.

Dusts are often defined as material that is minus 20 mesh (dust particles participate inefficiently in the flame propa­ gation process.