Thread: 3 Ton Derrick
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Old 17-09-06, 21:54
Grant Bowker Grant Bowker is online now
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Location: Ottawa, Canada
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Default Bob Carriere's derrick leg diameters

All 3 of the upper portions attached to the head sheave are the same size, approximately 2-7/8" I.D. and 3-1/4" O.D.
The lower end of the side leg (hooked fitting) is the same size as the uppers.
The lower portion of the middle leg (closed eye fitting) is smaller, approximately 2-7/8 O.D. and 2-1/2" I.D. which is close to 2-1/2" nominal schedule 40 pipe. The size of the larger pipe doesn't match any standard pipe, as far as I know.
Another oddity is that the Body Parts List lists all three legs as being 3 parts, upper, center and lower. This would be fine for the measurements seen for the outer legs (upper and lower are large diameter, center small diameter) but I don't understand how the middle leg would be assembled (upper large diameter, lower small diameter, but what to do for the centre?)
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