How to calculate the weight of a submerged hollow cylinder?

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SUMMARY

The discussion centers on calculating the maximum weight of a submerged hollow cylinder, specifically a 2-ton steel pipe, when lifted by a crane. The key factor is the buoyant force acting on the cylinder, which affects the lifting capacity required. As the cylinder is pulled up, the water inside will flow out, reducing the effective weight the crane must lift. Therefore, the crane primarily needs to account for the mass of the hollow cylinder itself, as the water will not contribute to the lifting load once it exits the cylinder.

PREREQUISITES
  • Understanding of buoyant force principles
  • Knowledge of basic physics related to mass and weight
  • Familiarity with crane lifting capacities
  • Basic geometry of hollow cylinders
NEXT STEPS
  • Research the principles of buoyancy and Archimedes' principle
  • Learn how to calculate the volume and mass of water based on cylinder dimensions
  • Investigate crane specifications and lifting capacity calculations
  • Explore fluid dynamics related to water flow in submerged objects
USEFUL FOR

Engineers, crane operators, and anyone involved in lifting operations or submerged object handling will benefit from this discussion.

shaufie
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A hollow cylinder (2 tons) is dipped in a chemical tank using hoist crane for treatment purpose.
Can anyone please help me to show how to calculate the maximum weight of the submerged hollow cylinder when it is being pulled up because I need to choose the correct lifting capacity for the crane. Is it related to the buoyant force? I need to know the maximum weight of the water inside the hollow that the crane need to lift. Thank you.
 

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Is there a way the water can be caught in the cylinder at all ? Looks to me it can flow out easily, so all you need to worry about is the mass of the steel pipe.
Proivded it goes slow enough.
 
the hollow cylinder is totally submerged in the chemical tank in a horizontal position so the crane will pull up not only the cylinder but also the water inside the hollow and when it reach the surface the water will flow out from the cylinder which will make it lighter. Can i just calculate the mass of the water based on the hollow dimension or is there any relation with buoyant force?
 
Crane doesn't lift the water (it flows out sideways), so pipe mass is basically all it has to pull.
 

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