• Login
    View Item 
    •   Home
    • Theses & Dissertations
    • 2020 - Mines Theses & Dissertations
    • View Item
    •   Home
    • Theses & Dissertations
    • 2020 - Mines Theses & Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Mines RepositoryCommunitiesPublication DateAuthorsTitlesSubjectsThis CollectionPublication DateAuthorsTitlesSubjects

    My Account

    Login

    Mines Links

    Arthur Lakes LibraryColorado School of Mines

    Statistics

    Display Statistics

    Ignition potential of transient sparks produced by abrasive waterjet cutting in explosive environments

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Charrier_mines_0052E_11898.pdf
    Size:
    4.407Mb
    Format:
    PDF
    Download
    Author
    Charrier, Erik K.
    Advisor
    Miller, Hugh B.
    Date issued
    2020
    Keywords
    ignition
    abrasive waterjet
    spark
    
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/11124/174063
    Abstract
    Explosive atmospheres are a significant hazard in many mining, mineral processing, and industrial workplaces. These workplaces often require hot work for maintenance, repairs, or production activities. If the workpiece cannot be removed from the potential explosive atmosphere, the hazard must be mitigated through engineering and administrative controls. The hazards must be identified, explosive atmospheres evacuated from the work area, sources of gases removed, and appropriate measure taken to prevent hazards from reentering the area during hot work. Despite these measures, fatalities and significant losses still occur. The ideal solution is to move up the hierarch of controls to substitution.Abrasive waterjet (AWJ) cutting is a potential substitute for hot drilling and cutting processes. At the macroscopic level, AWJ cutting of steel is a cool process. The scientific literature and industry experts have demonstrated that transient sparks can occur during AWJ cutting. No model of AWJ ignition potential is presently available in the literature. The spark generation process and sparks have not been characterized. A single published data set exists with ignitions reported at 300MPa (43.5kpsi) and is not representative of field cutting parameters that represent a potential hot work substitute.The AWJ ignition process was characterized and a model of AWJ ignition was developed. Energy transfer and spark generation were calculated from the model and the maximum potential spark was characterized. Based on the model, it was hypothesized that reducing the operating pressure would reduce the ignition rate. Experiments were conducted with AWJ parameters representative of field cutting applications. Drilling and linear cutting tests were conducted at 69MPa (10kpsi) in a hydrogen-oxygen atmosphere. No ignitions occurred during the drilling and cutting experiments. It is concluded that AWJ cutting is a promising potential hot work substitute for cutting and drilling steel in a subset of explosive atmospheres. Further parametric analysis is recommended.
    Rights
    Copyright of the original work is retained by the author.
    Collections
    2020 - Mines Theses & Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Quick Guide | Contact Us
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.