Calculating pressure of air pocket in a pressurized water column

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SUMMARY

The discussion centers on calculating the pressure of an air pocket in a pressurized water column within a 2-inch vertical pipe. The scenario involves a 24-inch tall pipe capped at the top, containing 2 inches of air and 40 psi of water pressure at the bottom. The pressure at the top of the water column, where the air pocket is located, is influenced by the hydrostatic pressure exerted by the water above it. The pressure drop as one moves up the water column must be calculated to determine the exact pressure experienced by the air pocket.

PREREQUISITES
  • Understanding of hydrostatic pressure principles
  • Familiarity with pressure measurement units (psi)
  • Basic knowledge of fluid mechanics
  • Experience with pressure calculations in vertical columns
NEXT STEPS
  • Research hydrostatic pressure calculations in fluid mechanics
  • Learn about pressure drop calculations in vertical fluid columns
  • Explore the effects of air pressure on fluid dynamics
  • Study the behavior of gases in pressurized systems
USEFUL FOR

This discussion is beneficial for engineers, fluid mechanics students, and anyone involved in designing or analyzing pressurized fluid systems, particularly in applications involving air pockets in water columns.

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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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