Calculating pressure of air pocket in a pressurized water column

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Discussion Overview

The discussion revolves around calculating the pressure of an air pocket in a pressurized water column, specifically in a scenario involving a vertical pipe with a defined height and pressure conditions. The focus includes understanding the relationship between the water pressure and the air pocket at the top of the column.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant seeks guidance on calculating the pressure of an air pocket in a vertical pipe with water pressure applied.
  • Another participant clarifies the setup by asking if the air bubble is at the top of the column and where the 40 psi water pressure is being measured.
  • A participant specifies that the water supply line pressure is 40 psi, with the air pocket located at the top of a 24-inch column.
  • There is a question about the pressure drop as one moves up the water column from the bottom to the top.

Areas of Agreement / Disagreement

Participants are engaged in clarifying the setup and parameters of the problem, but no consensus or resolution has been reached regarding the calculation of pressure or the implications of the setup.

Contextual Notes

The discussion does not provide specific assumptions about the behavior of the air pocket or the water column, nor does it resolve how pressure changes with height in the water column.

cvsanders
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TL;DR
Calculating pressure of air pocket in pressurized water column.
Looking for some guidance in calculating pressure of air pocket in pressurized water column. Example: 2" vertical pipe, capped, with 2" of air and 40 psi water applied.
 
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Welcome to PF. :smile:

Presumably the air bubble is at the top of the column, right? Where are you measuring the 40psi water pressure? At the top or bottom of the water column? How tall is the pipe?
 
Water supply line pressure is 40 psi, air is at top of 24" column, where it is being read.
 
So the 24" tall pipe has 40psi water at the bottom. How much does the pressure drop going up that water column...? :smile:
 

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