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.”