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Vulcan: The Offshore Experience


Below are listed the center axial centers of gravity for Vulcan Offshore Hammers.

HAMMER SIZE CENTER OF GRAVITY
Inches
020 73.0
030 84.0
340 93.0
530 99.0
360 94.0
540 108.0
3100 118.0
560 109.0
5100 131.0
5150 124.0
4250 129.0
6300 140.0
Note: Tip dated 1 August 1980. Some Vulcan sales people also carried the chart below. Keep in mind that the weights for the pipe cap are probably before the "Light Weight High Strength" pipe caps begun in the early 1980's. The hammer distance from the top and the leader weights are also probably conditioned by the Vulcan leader design before the "Light Weight Pipe Construction" leaders started in the early 1980's. The chart below was intended to be more informative to those who were doing calculations for the "pipe stickup" requirements of API RP2A, which was the main purpose of the center of gravity data in the first place.

Click here for details on the Internal Pile Hammer, which would have both reduced the assembly weight and the centre of gravity.

OFFTP22A.gif (5361 bytes)
  • W1 = Weight of hammer, striking parts, and typical pile cap (lbs.)
  • D1 = Distance from top of pile to center of gravity of hammer (ft.)
  • W2 = Weight of leaders or guide cages (lbs.)
  • D2 = Distance from bottom of bell to center of gravity of leaders (ft.)
Hammer W1 D1 W2 D2
016 Steam 42940 5.1 16850 20.0
020 Steam 53785 6.7 16850 20.0
030 Steam 65410 8.4 16850 20.0
340 Steam 129440 8.0 30000 24.1
530 Steam (54" Jaws) 67860 8.5 16850 20.0
530 Steam (80" Jaws) 89680 6.7 29700 24.1
360 Steam 167430 8.7 64750 25.8
540 Steam 135780 8.0 33700 24.1
560 Steam 179960 8.8 68000 25.8
5100 Steam 288500 11.1 110000 31.5
5150 Steam 351380 11.6 110000 31.5
5250 Steam 558000 9.8 137000 35.0
6300 Steam 712000 13.0 137000 35.0
200C Steam 52315 7.8 15500 20.0

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