Explosion Pressure Design Criteria For New Seals In U S Coal Mines
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Explosion Pressure Design Criteria For New Seals In U S Coal Mines
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Author : M. J. Sapko
language : en
Publisher:
Release Date : 2007
Explosion Pressure Design Criteria For New Seals In U S Coal Mines written by M. J. Sapko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Mine explosions categories.
Seals are barriers constructed in underground coal mines throughout the United States to isolate abandoned mining panels or groups of panels from the active workings. Historically, mining regulations required seals to withstand a 140-kPa (20-psig) explosion pressure. However, the Mine Improvement and New Emergency Response Act ("MINER Act") requires the Mine Safety and Health Administration (MSHA) to increase this design standard by the end of 2007. This report provides a sound scientific and engineering justification to recommend a three-tiered explosion pressure design criterion for new seals in coal mines in response to the MINER Act. Much of the information contained in this report also applies to existing seals. Engineers from the National Institute for Occupational Safety and Health (NIOSH) examined seal design criteria and practices used in the United States, Europe, and Australia and then classified seals into their various applications. Next, the engineers considered various kinds of explosive atmospheres that can accumulate within sealed areas and used thermodynamic calculations and simple gas explosion models to estimate worst-case explosion pressures that could impact seals. Three design pressure-time curves were developed for the dynamic structural analysis of new seals under the conditions in which those seals may be used: unmonitored seals where there is a possibility of methane-air detonation or high-pressure nonreactive shock waves and their reflections behind the seal; unmonitored seals with little likelihood of detonation or high-pressure nonreactive shock waves and their reflections; and monitored seals where the amount of potentially explosive methane-air is strictly limited and controlled. Figure I is a simple flowchart that illustrates the key decisions in choosing between the monitored or unmonitored seal design approaches and the three design pressure-time curves. For the first condition, an unmonitored seal with an explosion run-up length of more than 50 m (165 ft), the possibility of detonation or high-pressure nonreactive shock waves and their reflections exists. The recommended design pressure-time curve rises to 4.4 MPa (640 psig) and then falls to the 800-kPa (120-psig) constant volume (CV) explosion overpressure. For unmonitored seals with an explosion run-up length of less than 50 m (165 ft), the possibility of detonation or high-pressure nonreactive shock waves and their reflections is less likely. A less severe design pressure-time curve that simply rises to the 800-kPa (120-psig) CV explosion overpressure may be employed. For monitored seals, engineers can use a 345-kPa (50-psig) design pressure-time curve if monitoring can ensure that (1) the maximum length of explosive mix behind a seal does not exceed 5 m (16 ft) and (2) the volume of explosive mix does not exceed 40% of the total sealed volume. Use of this 345-kPa (50-psig) design pressure-time curve requires monitoring and active management of the sealed area atmosphere. These design pressure-time curves apply to new seal design and construction. NIOSH engineers used these design pressure-time curves along with the Wall Analysis Code (WAC) from the U.S. Army Corps of Engineers and a simple plug analysis to develop design charts for the minimum required seal thickness to withstand each of these explosion pressure-time curves. These design charts consider a range of practical construction materials used in the mining industry and specify a minimum seal thickness given a certain seal height. Results of these analyses show that resistance to even the 4.4-MPa (640-psig) design pressure time curve can be achieved using common seal construction materials at reasonable thickness, demonstrating the feasibility and practical applications of this report. Engineers can also use other structural analysis programs to analyze and design seals by using the appropriate design pressure-time curve for the structural load and a design safety factor of 2 or more. Finally, this report also provides criteria for monitoring the atmosphere behind seals. NIOSH will continue research efforts to improve underground coal mine sealing strategies and to prevent explosions in sealed areas of coal mines. In collaboration with the U.S. National Laboratories, NIOSH will further examine the dynamics of methane and coal dust explosions in mines and the dynamic response of seals to these explosion loads. This upcoming project seeks to better understand the detonation phenomena and simple techniques to protect seals from transient pressures. Additional work will include field measurements of the atmosphere within sealed areas. Successful implementation of the seal design criteria and the associated recommendations in this report for new seal design and construction should significantly reduce the risk of seal failure due to explosions in abandoned areas of underground coal mines.
Compendium Of Structural Testing Data For 20 Psi Coal Mine Seals
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Author : Karl Zipf
language : en
Publisher: Createspace Independent Pub
Release Date : 2009-08-31
Compendium Of Structural Testing Data For 20 Psi Coal Mine Seals written by Karl Zipf and has been published by Createspace Independent Pub this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-08-31 with Technology & Engineering categories.
This report presents nearly all structural data available from explosion tests of 20-psi mine ventilation seals and concrete-block ventilation stoppings that were conducted by the NIOSH during 1997-2008. Although the seals tested were designed to meet the former federal 20-psi pressure design standard, the structural information contained herein on these seal tests will facilitate the analysis and design of coal mine seals that meet the new explosion pressure criteria of 50 and 120 psi as set forth in the Mine safety and health Administration's final rule on “Sealing of Abandoned Areas.”
Explosions In Underground Coal Mines
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Author : Jianwei Cheng
language : en
Publisher: Springer
Release Date : 2018-03-23
Explosions In Underground Coal Mines written by Jianwei Cheng and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-23 with Science categories.
This book addresses the hazard of gas explosions in sealed underground coal mines, and how the risk of explosion can be assessed, modeled, and mitigated. With this text, coal mine operators and managers will be able to identify the risks that lead to underground mine gas explosions, and implement practical strategies to optimize mining safety for workers. In six chapters, the book offers a framework for understanding the sealed coal mine atmosphere, the safety characteristics that are currently in place, and the guidelines to be followed by engineers to improve upon these characteristics. The first part of the book describes the importance and characteristics of underground gas mine explosions in a historical context with data showing the high number of fatalities from explosion incidents, and how risk has been mitigated in the past. Chapters also detail mathematical models and explosibility diagrams for determining and understanding the risk factors involved in mine explosions. Readers will also learn about safety operations, and assessments for the sealed mine atmosphere. With descriptions of chapter case studies, mining engineers and researchers will learn how to apply safety measures in underground coal mines to improve mining atmospheres and save lives.
The S Miner Act H R 2768 And The Miner Health Enhancement Act Of 2007 H R 2769
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Author : United States. Congress. House. Committee on Education and Labor. Subcommittee on Workforce Protections
language : en
Publisher:
Release Date : 2008
The S Miner Act H R 2768 And The Miner Health Enhancement Act Of 2007 H R 2769 written by United States. Congress. House. Committee on Education and Labor. Subcommittee on Workforce Protections and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Law categories.
Improving Mine Safety
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Author : United States. Congress. Senate. Committee on Appropriations. Subcommittee on Departments of Labor, Health and Human Services, Education, and Related Agencies
language : en
Publisher:
Release Date : 2008
Improving Mine Safety written by United States. Congress. Senate. Committee on Appropriations. Subcommittee on Departments of Labor, Health and Human Services, Education, and Related Agencies and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Coal mine accidents categories.
Extracting The Science
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Author : Jürgen Brune
language : en
Publisher: SME
Release Date : 2010
Extracting The Science written by Jürgen Brune and has been published by SME this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Technology & Engineering categories.
These research papers also cover a spectrum of innovative technical solutions, including computer-controlled mining equipment, remote monitoring of air quality, and virtual reality training systems.
Promises Or Progress
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Author : United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions. Subcommittee on Employment and Workplace Safety
language : en
Publisher:
Release Date : 2009
Promises Or Progress written by United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions. Subcommittee on Employment and Workplace Safety and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Coal mines and mining categories.
The Explosion Hazard In Mining
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Author : John Nagy
language : en
Publisher:
Release Date : 1981
The Explosion Hazard In Mining written by John Nagy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Mine explosions categories.
The State Of Mine Safety And Health
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Author : United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions
language : en
Publisher:
Release Date : 2006
The State Of Mine Safety And Health written by United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Technology & Engineering categories.
Daily Labor Report
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Author :
language : en
Publisher:
Release Date : 2007-02
Daily Labor Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-02 with Labor categories.