Laserfiche WebLink
inspection, the maximum. charge -per -delay (w) must conform to the scaled distance <br />limitations as prescribed in Option 2. <br />(1) The following equation shall be applied when calculating the scaled distance. <br />Ds = D <br />�w <br />W= <br />D2 <br />2) Option 2 --(Scaled DS Distance) --when seismic <br />monitoring is not performed, the maximum <br />weight of the explosive detonating within any 8 - <br />millisecond time period shall not exceed the amount allowed by a calculation using the <br />scaled distance factors given in Scaled Distance column of Table 6.10A. <br />(a) The following equation shall be applied when utilizing the scaled distance <br />calculations to control blast -induced vibration. <br />Where: Ds = Scaled Distance (ft/lb f) <br />D = Distance to the nearest structure (ft) <br />W = Weight of explosive detonated within any 8 millisecond window <br />Example: Maximum Charge Weight (W) per Delay Calculation <br />Given: Scaled Distance (Ds) = 55 <br />Distance (D) is 500 ft. <br />Maximum Charge per Delay (W) = (500 / 55)- = 82.6 lb <br />TABLE 6.10A <br />DISTANCE <br />OPTION 1 <br />OPTION 2 <br />FROM BLAST (FT.) <br />MAPV <br />SCALED DISTANCE FACTOR <br />(MAYANIUM ALLOWABLE PARTICLE VELOCITY) <br />UNITS ARE FT -LB 0.5 <br />MEASURED AS INCHES/ SECOND IN VERTICLE, <br />TRANSVERSE, OR LONGITUDINAL DIRECTIONS. <br />0 TO 300 <br />2.00 <br />50 <br />301 to 5000 <br />1.55 <br />55 <br />5001 and GREATER <br />1.00 <br />65 <br />54 <br />