Read or Download BS EN 1015-9:1999: Methods of test for mortar for masonry. Determination of workable life and correction time of fresh mortar PDF
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Extra resources for BS EN 1015-9:1999: Methods of test for mortar for masonry. Determination of workable life and correction time of fresh mortar
Effects of Methane Drainage on Longwall Face Emissions The overall reduction in average face emission rates due to methane drainage can be evaluated by analyzing the panel extraction phase and combining it with premining methane drainage performance. The average reductions in longwall face emission rates due to methane drainage before and during mining were calculated and are shown in Figure 11 and Table 4. The data show that longwall face emissions were reduced by 11 m3/min (400 cfm) with 12 months of premining methane drainage using borehole pattern B.
The time study data for the 3 days of the study showed 19 gas delays (shutdowns of mining equipment due to excessive methane concentrations) on 10 of the 11 complete H–T passes. The average location for the gas delays on the H–T passes was shield 119, 245 m (804 ft) or 78% of the distance from the headgate corner. 41 Monitoring data show that when longwall gas delays occur, the methane contributions from the face conveyor and shearer dramatically increase in their relative contribution to the total face emissions.
Methane delays on the longwall face increased from the first to third day of the study as the longwall face reached the approximate maximum distance from the nearest operating gob gas venthole prior to interception of the next venthole, 2 days after the study was completed. —Average methane emission rates for each day of study determined for each face segment. On day 2 of the study, the presence of a horizontal borehole on the face was noted near the tailgate side of the panel at shield 140. On day 3 of the study, the interception of the hori zontal borehole near the headgate at shield 23 was observed.
BS EN 1015-9:1999: Methods of test for mortar for masonry. Determination of workable life and correction time of fresh mortar