Calculate Water to Increase Cylinder Pressure from 50 to 150 PSI

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SUMMARY

The discussion centers on calculating the amount of water needed to increase the pressure in a cylinder from 50 PSI to 150 PSI. The user initially assumes that adding three times the water will triple the density and thus the pressure. However, a key insight is that water is not an ideal gas, and its compressibility must be considered. The density of water at 50 PSI is approximately 1 g/cm³, and the total volume of water in the pipeline is 57500 cubic feet, equating to roughly 3.6 million pounds of water.

PREREQUISITES
  • Understanding of fluid mechanics principles, specifically pressure and density relationships.
  • Knowledge of water compressibility and its effects on pressure calculations.
  • Familiarity with the properties of water at varying pressures.
  • Basic mathematical skills for volume and density calculations.
NEXT STEPS
  • Research the compressibility of water and how it affects pressure calculations.
  • Learn about the relationship between pressure, density, and volume in non-ideal fluids.
  • Study fluid dynamics principles relevant to pipeline systems.
  • Explore practical applications of pressure calculations in engineering contexts.
USEFUL FOR

This discussion is beneficial for engineers, fluid mechanics students, and professionals involved in pipeline design and pressure management. It provides insights into the complexities of fluid behavior under pressure changes.

Lowdot
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If I have a cylinder with water at 50 PSI, is there any way to calculate how much water it would take to raise the pressure to 150 PSI?
 
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Pressure = height x density.
 
Let me add some additional information. This is for a pipeline with roughly 3.6 million pounds of water and 57500 cubic feet of area. The density is just over 1 g/cm3 at 50 PSI. Height will remain constant as will the volume. So by my thinking, I will have to add 3 times the water to increase the density by 3 times and thus the pressure 3 times. But that is contrary to my experiences with raising the PSI of pipelines in this manner.

Any thoughts?
 
You are thinking of an ideal gas. Water is no such thing. You need a figure for the compessiblity of water.
 

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