aerowave89
Mechanical
- Mar 25, 2015
- 4
Hi Guys,
I am designing an Oil Boom that spans 1000m in length. The boom is assembled from 10m sections, connected by a 10mm Stainless Steel 316 pin joint at each section. The top side of the boom is strengthened by a 7 tonne sling. Ideally, the drag force should be transmitted to the sling to prevent failure of the PVC reinforced polyester material (breaking strength 3500 N/50mm). Depth of skirt (submerged in water) is 1.1m stabilized with chain ballast, and free board is (above water) 0.6m. Thickness of skirt is 1.8mm.
Drag Calculation is as follows:
Fd = 0.5 * Cd * p * A * (v^2)
where
Cd = drag coefficient, depending on material geometry and properties when subjected to external force
p = fluid density (kg/m3)
A = body cross-sectional area (m2)
v = velocity (m/s)
Fluid density of seawater is 1060 kg/m3
Cross sectional area is 1.1m x 1000m = 1100 m2
velocity of tugboat is around 3 knots = 1.54 m/s
What is the drag coefficient for this material? Considering the geometry and flexibility.
Please advise.
Thanks,
Tom
I am designing an Oil Boom that spans 1000m in length. The boom is assembled from 10m sections, connected by a 10mm Stainless Steel 316 pin joint at each section. The top side of the boom is strengthened by a 7 tonne sling. Ideally, the drag force should be transmitted to the sling to prevent failure of the PVC reinforced polyester material (breaking strength 3500 N/50mm). Depth of skirt (submerged in water) is 1.1m stabilized with chain ballast, and free board is (above water) 0.6m. Thickness of skirt is 1.8mm.
Drag Calculation is as follows:
Fd = 0.5 * Cd * p * A * (v^2)
where
Cd = drag coefficient, depending on material geometry and properties when subjected to external force
p = fluid density (kg/m3)
A = body cross-sectional area (m2)
v = velocity (m/s)
Fluid density of seawater is 1060 kg/m3
Cross sectional area is 1.1m x 1000m = 1100 m2
velocity of tugboat is around 3 knots = 1.54 m/s
What is the drag coefficient for this material? Considering the geometry and flexibility.
Please advise.
Thanks,
Tom
