How to calculate the weight of a submerged hollow cylinder?

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Discussion Overview

The discussion centers on calculating the maximum weight of a submerged hollow cylinder, specifically in the context of determining the appropriate lifting capacity for a crane. Participants explore the implications of buoyant force and the behavior of water within the hollow cylinder during the lifting process.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the relationship between the buoyant force and the maximum weight of the submerged hollow cylinder that the crane needs to lift.
  • Another participant questions whether water can be retained in the cylinder, suggesting that it may flow out easily, thus only the mass of the steel pipe would need to be considered if the lifting is done slowly.
  • A different participant asserts that since the hollow cylinder is fully submerged and horizontal, the crane will need to lift both the cylinder and the water inside it, but notes that the water will flow out when reaching the surface, potentially affecting the weight calculation.
  • One participant argues that the crane does not lift the water as it flows out sideways, implying that only the mass of the pipe is relevant for the lifting calculation.

Areas of Agreement / Disagreement

Participants express differing views on whether the water inside the hollow cylinder contributes to the weight that the crane must lift. There is no consensus on the role of buoyant force or the retention of water within the cylinder during the lifting process.

Contextual Notes

Participants have not reached a resolution on the assumptions regarding water retention and the effects of buoyant force on the lifting calculations. The discussion reflects varying interpretations of the physical scenario.

Who May Find This Useful

Individuals interested in mechanical engineering, crane operations, fluid dynamics, or those involved in industrial lifting applications may find this discussion relevant.

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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