Difference between revisions of "User:Vincecate/Pipe Spar"
(New page: Looking at [http://www.offshore-technology.com/projects/red-hawk/ Red Hawk Spar] and thinking about using standard pipes to make a spar. Lets look at [http://www.vitaneedle.com/pages/sml...) |
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Looking at [http://www.offshore-technology.com/projects/red-hawk/ Red Hawk Spar] and thinking about using standard pipes to make a spar. | Looking at [http://www.offshore-technology.com/projects/red-hawk/ Red Hawk Spar] and thinking about using standard pipes to make a spar. | ||
| − | Lets look at [http://www.vitaneedle.com/pages/smls_pipe.htm | + | Lets look at [http://www.vitaneedle.com/pages/smls_pipe.htm 36 inch sched-40 stainless steel pipe]. This is [http://www.vitaneedle.com/pages/pipe_schedules.htm probably 0.375 inch thick]. The [http://www.simetric.co.uk/si_metals.htm density of stainless steel is about 8000 Kg/m^3 or 8 grams/cc]. |
At 36 inches diameter it is about 287 cm in circumference. If we have a pipe 150 meters long this is 8*287*150*100=34440000 grams or 34,440 Kg. Stainless costs around $5/Kg with a pipe being a bit more than this. | At 36 inches diameter it is about 287 cm in circumference. If we have a pipe 150 meters long this is 8*287*150*100=34440000 grams or 34,440 Kg. Stainless costs around $5/Kg with a pipe being a bit more than this. | ||
Revision as of 03:22, 10 June 2008
Looking at Red Hawk Spar and thinking about using standard pipes to make a spar.
Lets look at 36 inch sched-40 stainless steel pipe. This is probably 0.375 inch thick. The density of stainless steel is about 8000 Kg/m^3 or 8 grams/cc. At 36 inches diameter it is about 287 cm in circumference. If we have a pipe 150 meters long this is 8*287*150*100=34440000 grams or 34,440 Kg. Stainless costs around $5/Kg with a pipe being a bit more than this.
If we have 20 meters above water we have 130 meters underwater. Displacement for 3 foot diameter pipe is 1.5*1.5*3.141592 = 7.069 per linear foot. With 426.5 feet underwater and each cubic foot of water is 60 lbs, then 7.06858200 * 426.5 * 60 = 180885 lbs or 180885/2.2= 82,220 Kg.
After taking out the weight of the pipe, we have 82,220-34,440= 47,780 Kg for ballast and living space. If we use half for ballast then we have 47780/2 = 23,890 Kg for living space.
