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Evaluation Of Explosion Resistant Seals Stoppings And Overcast For Ventilation Control In Underground Coal Mining
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Book Synopsis Evaluation of Explosion-Resistant Seals, Stoppings, and Overcast for Ventilation Control in Underground Coal Mining by : Eric S. Weiss
Download or read book Evaluation of Explosion-Resistant Seals, Stoppings, and Overcast for Ventilation Control in Underground Coal Mining written by Eric S. Weiss and published by Createspace Independent Pub. This book was released on 2002 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses the construction techniques, testing methods, and explosion test data collected for the pumpable cementitious seals; the seal, stopping, and overcast designs for the Australian program; and the Packsetter preloaded solid-concrete-block seal.
Book Synopsis Explosion Pressure Design Criteria for New Seals in U.S. Coal Mines by : M. J. Sapko
Download or read book Explosion Pressure Design Criteria for New Seals in U.S. Coal Mines written by M. J. Sapko and published by . This book was released on 2007 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author :United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions Publisher : ISBN 13 : Total Pages :128 pages Book Rating :4.0/5 ( download)
Book Synopsis The State of Mine Safety and Health by : United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions
Download or read book The State of Mine Safety and Health written by United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions and published by . This book was released on 2006 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transactions of Society for Mining, Metallurgy, and Exploration, Inc by :
Download or read book Transactions of Society for Mining, Metallurgy, and Exploration, Inc written by and published by . This book was released on 1990 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strengthening Existing 20-Psi Mine Ventilation Seals with Carbon Fiber-Reinforced Polymer Reinforcement by : Eric S. Weiss
Download or read book Strengthening Existing 20-Psi Mine Ventilation Seals with Carbon Fiber-Reinforced Polymer Reinforcement written by Eric S. Weiss and published by Createspace Independent Pub. This book was released on 2008-01-31 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The National Mining Association and the Mine safety and Health Administration requested that the National Institute for Occupational Safety and Health (NIOSH) conduct full-scale evaluations of a recently developed carbon fiber-reinforced polymer (CFRP) reinforcement technique for upgrading existing mine ventilation seals to withstand an explosion pressure of 50 psi or greater. The evaluation was conducted in the NIOSH Pittsburgh Research Laboratory's Lake Lynn Experimental Mine (LLEM). The purpose of the evaluation was to determine the blast resistance of the CFRP reinforcement technique, designed to increase the strength of two types of existing 20-psi-rated in situ mine ventilation seals.
Book Synopsis Compendium of Structural Testing Data for 20-Psi Coal Mine Seals by : Karl Zipf
Download or read book Compendium of Structural Testing Data for 20-Psi Coal Mine Seals written by Karl Zipf and published by Createspace Independent Pub. This book was released on 2009-08-31 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.”
Book Synopsis A Story of Impact by : National Institute for Occupational Safety and Health
Download or read book A Story of Impact written by National Institute for Occupational Safety and Health and published by . This book was released on 2010 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Seals, which are used in underground coal mines throughout the U.S. to isolate abandoned mining areas from the active workings, were required to withstand a 140-kPa (20-psig) explosion pressure under mining regulations prior to the Sago Mine disaster in 2006. The failure of seals at Sago prompted sweeping regulatory changes that were initiated with the passage of the Mine Improvement and New Emergency Response Act (MINER act), which required MSHA to increase the seal design standard by the end of 2007. Based on sound scientific and engineering justification, NIOSH researchers developed explosion pressure design criteria for new seal designs and for monitoring the atmosphere behind seals to protect miners from blast effects and toxic gases produced by contained explosions. This information was published in July 2007. In 2008, MSHA issued the final rule for mine seals based, in part, on the information contained in this NIOSH report. The final rule states that seals must withstand 345 kPa (50 psig) if the sealed area atmosphere is monitored and maintained inert, 828 kPa (120 psig) if the sealed area atmosphere is not monitored, and greater than 828 kPa (120 psig) if the sealed area atmosphere is not monitored and certain conditions exist that might lead to higher explosion pressures. From 2001 to 2007, the NIOSH Office of Mine Safety and Health Research conducted studies to develop alternative ways to determine the adequacy of coal mine seals. The researchers compared full-scale explosion testing within the Lake Lynn Experimental Mine to full-scale hydrostatic testing within a chamber using water to load seals to pressure. Researchers found that gradually applying water pressure to twice the expected explosion pressure was equivalent to the effects created by the rapid increase in pressure loading that results from confined explosions. These hydrostatic tests provided stress-strain measurements, determined the ultimate strength of seals, and demonstrated that hydrostatic testing of mine seals was a timely and cost-effective alternative to full-scale explosion testing. Results of these studies should be used with the testing of mine ventilation seals. NIOSH Recommendations: 1. Use hydrostatic testing of mine seals in place of or in conjunction with full-scale explosion testing as a means to validate engineering calculations and models. 2. Use empirical resistance data from the hydrostatic testing to improve or validate design codes. These new data should be considered when using or evaluating design codes. 3. Test seals under static load at least twice the explosion design pressure when performing hydrostatic tests. 4. Conduct additional studies to further refine and quantify the response. 5. Utilize only design codes validated by testing for mine seal design." - NIOSHTIC-2
Book Synopsis Evaluation of the Transverse Load Capacity of Block Stoppings for Mine Ventilation Control by :
Download or read book Evaluation of the Transverse Load Capacity of Block Stoppings for Mine Ventilation Control written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Compendium of Structural Testing Data for 20-Psi Coal Mine Seals by : Department of Health and Human Services
Download or read book Compendium of Structural Testing Data for 20-Psi Coal Mine Seals written by Department of Health and Human Services and published by CreateSpace. This book was released on 2013-10 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 National Institute for Occupational Safety and Health 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 design criteria of 50 and 120 psi as set forth in the Mine Safety and Health Administration (MSHA)'s final rule on “Sealing of Abandoned Areas.” The seal testing data are organized into six broad categories of seal structures based on the materials used and the construction method for those 20-psi seals: 1. Concrete like materials with steel reinforcement and reinforcement bar anchorage to rock; 2. Pumpable cementitious materials of varying compressive strengths with no steel reinforcement and no hitching; 3. Articulated structures such as solid-concrete-block seals and ventilation stoppings made of solid and hollow-core concrete blocks; 4. Polymer and aggregate materials without hitching; 5. Wood-crib-block seals with or without hitching; 6. Articulated structures such as lightweight blocks with or without hitching. This report organizes and presents the applied loading or P-t curves and, when available, the measured displacement-time (D-t) curves for 44 different seal structures tested prior to 2006 when the former 20-psi explosion pressure design criterion applied to mine seals. Also included in this data set are the applied loading P-t curves and response D-t curves for eight different ventilation stoppings constructed with solid or hollow-core concrete blocks. These structural test results against the stop-pings are included as supplemental information pertinent to the design of seals that incorporate concrete blocks in some capacity.
Book Synopsis Explosion-resistant Seals for Underground Coal Mines, June 1999 by :
Download or read book Explosion-resistant Seals for Underground Coal Mines, June 1999 written by and published by . This book was released on 1999 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ventilation Questions and Answers by :
Download or read book Ventilation Questions and Answers written by and published by . This book was released on 1992 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strength and leakage evaluations for coal mine seals by by :
Download or read book Strength and leakage evaluations for coal mine seals by written by and published by . This book was released on 1993 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Bureau of Mines and the U.S. Mine Safety and Health Administration (MSHA) are participating jointly in a research program to evaluate the strength characteristics and air leakage resistance of various existing and proposed seal designs for use in underground coal mines. Over 20 full-scale seals were constructed in the Bureau's experimental mine at the Lake Lynn Laboratory, air leakage tested, and then subjected to pressure pulses of 0.14 MPa or-greater. A discussion on.the experimental procedure; including the facility description, construction techniques of the various seal designs, and the methods for determining the air leakage rates across the seals is presented.
Book Synopsis A Technical Evaluation of Timber Ventilation Seals at the Powderhorn Coal Company Roadside Mine Palisade, Colorado by : Clete R. Stephan
Download or read book A Technical Evaluation of Timber Ventilation Seals at the Powderhorn Coal Company Roadside Mine Palisade, Colorado written by Clete R. Stephan and published by . This book was released on 1977 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Injury Experience in Coal Mining by :
Download or read book Injury Experience in Coal Mining written by and published by . This book was released on 1949 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :New Zealand. Royal Commission on the Pike River Coal Mine Tragedy Publisher : ISBN 13 : Total Pages :40 pages Book Rating :4.:/5 (817 download)
Book Synopsis Royal Commission on the Pike River Coal Mine Tragedy by : New Zealand. Royal Commission on the Pike River Coal Mine Tragedy
Download or read book Royal Commission on the Pike River Coal Mine Tragedy written by New Zealand. Royal Commission on the Pike River Coal Mine Tragedy and published by . This book was released on 2012 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Details the tragic events at Pike River Coal Mine on 19 November that resulted in the loss of 29 lives. Propsoals and recommendations for improvements to the safety of people working in mines.
Download or read book Blindsight written by Peter Watts and published by Macmillan. This book was released on 2006-10-03 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hugo and Shirley Jackson award-winning Peter Watts stands on the cutting edge of hard SF with his acclaimed novel, Blindsight Two months since the stars fell... Two months of silence, while a world held its breath. Now some half-derelict space probe, sparking fitfully past Neptune's orbit, hears a whisper from the edge of the solar system: a faint signal sweeping the cosmos like a lighthouse beam. Whatever's out there isn't talking to us. It's talking to some distant star, perhaps. Or perhaps to something closer, something en route. So who do you send to force introductions with unknown and unknowable alien intellect that doesn't wish to be met? You send a linguist with multiple personalities, her brain surgically partitioned into separate, sentient processing cores. You send a biologist so radically interfaced with machinery that he sees x-rays and tastes ultrasound. You send a pacifist warrior in the faint hope she won't be needed. You send a monster to command them all, an extinct hominid predator once called vampire, recalled from the grave with the voodoo of recombinant genetics and the blood of sociopaths. And you send a synthesist—an informational topologist with half his mind gone—as an interface between here and there. Pray they can be trusted with the fate of a world. They may be more alien than the thing they've been sent to find. At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.
Download or read book Pentagon 9/11 written by Alfred Goldberg and published by Office of the Secretary, Historical Offi. This book was released on 2007-09-05 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most comprehensive account to date of the 9/11 attack on the Pentagon and aftermath, this volume includes unprecedented details on the impact on the Pentagon building and personnel and the scope of the rescue, recovery, and caregiving effort. It features 32 pages of photographs and more than a dozen diagrams and illustrations not previously available.
