November 30, 2005:
Imploding Pearman Pier D-25
It was a long long day - starting about 6:30 this morning - a day to
watch the loading of D-25 and the implosion. After putting this together,
I visited Google using dynamite sequence control - and found two really
good tutorials.
Learning Links
We made several video options revealing the dynamics of today's implosion
of D-25:
What was remarkable to me was how the sequencing of the detonation was
controlled. Watch
how Mickey's team loaded and fused the explosives. Here is the
implosion sequence from still photos and from frames of the video.
t = 15:53:08
Here you can see the detonation sequence progressing upward - t = 15:53:09
I extracted each individual fram from the video (30 frames/sec) in order
to explore the individual ignitions - as shown below. Every frame is
not shown - but I have indicated the time of each frame assuming 30 frames/sec.
The bright (sort of) dots and lines are the individual ignition events - better
seen in the shadow portion of the two columns.
t = 0, 0.033, 0.067
t = 0.100, 0.133, 0.233
t = 0.367, 0.533, 0.600
t = 0.633, 0.700, 0.733
t = 0.800, 0.867, 0.900
t = 0.933, 0.967, 1.000
t = 1.033, 1.067, 1.100
t = 1.133, 1.200, 1.233
At this point, the lower 300 ms delays have kicked in and the base starts
to ignite - looking like the upward directed base dynamite ignition is
chasing the upward directed fuse ignition.
t = 1.267, 1.333, 1.367
t = 1.400, 1.433, 1.467
t = 1.500, 1.600, 1.633
t = 1.667, 1.700. 1.733
t = 1.767, 1.800, 1.833
t = 1.967, 2.100, 2.633
and here the cap ignites
t = 2.700, 2.733, 2.800
Here you note almost no vertical component of the blast - t = 15:53:09+
t = 15:53:10
t = 15:53:11
t = 15:53:12
t = 15:53:28
t = 15:57:49
With Cousin Arthur smiling his approval - all that remains is the lower
support - which will be the target of a separate preparation and detonation.
And of course - transport courtesy of Sharon.
and a view of the Ravenel Bridge without D-25 in the background
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