Calc Air Pressure in Tank with Fluid Level & Height

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SUMMARY

The discussion focuses on calculating the headspace pressure in a closed tank partially filled with fluid, specifically addressing the pressure at the interface between the air and the liquid. The fluid has a specific gravity (s.g.) of 1.2, with a fluid height of 1.7m and a total height of 5m above the measurement point. The correct calculation for the air pressure in the tank's headspace is determined to be 58680 N/m², which is derived using hydrostatic pressure principles rather than the ideal gas law.

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  • #31
jderulo said:
58860N.m^-2 ? Assuming a head of 5m?
Yes. That's the air pressure in the tank headspace (over and above atmospheric pressure).

Chet
 
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  • #32
Thanks Chet - I had that value earlier, was you trying to see if I understood it?

The y value, the 1.7m - seems odd that I do not include that. I always thought we had to use all the data in chem eng problems. At least I have in the past!
 
  • #33
jderulo said:
Thanks Chet - I had that value earlier, was you trying to see if I understood it?

The y value, the 1.7m - seems odd that I do not include that. I always thought we had to use all the data in chem eng problems. At least I have in the past!
Why do you think they put the y into the problem description?
 
  • #34
Chestermiller said:
Why do you think they put the y into the problem description?
Not really sure can only assume it would make the solution glaringly obvious if it wasn't there...?
 
  • #35
jderulo said:
Not really sure can only assume it would make the solution glaringly obvious if it wasn't there...?
Exactly.
 

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