How Much Water is Needed to Increase Pipeline Pressure for a Hydro Test?

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SUMMARY

This discussion focuses on calculating the amount of water required to increase the pressure in a 2-inch, 6.5 km long pipeline during a hydro test. The volume of the pipeline is calculated to be 13.17 m³ using the formula πr² × height. To achieve a pressure increase to 10 barg, the user seeks to understand the relationship between water density at varying pressures and the pipeline's expansion under pressure. Key resources mentioned include water density tables and the bulk compressibility of water, estimated at 5 x 10-4/MPa.

PREREQUISITES
  • Understanding of hydrostatic pressure principles
  • Familiarity with water density tables at varying pressures
  • Knowledge of pipeline material properties and expansion
  • Basic mathematical skills for volume and pressure calculations
NEXT STEPS
  • Research "water density table pressure" for accurate density values at different pressures
  • Investigate the effects of pipeline material expansion under pressure
  • Learn about bulk compressibility of fluids, specifically water
  • Explore hydrostatic pressure calculations in pipeline testing
USEFUL FOR

Engineers, pipeline technicians, and professionals involved in hydro testing and pressure management of pipelines will benefit from this discussion.

G Neilson
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I am trying to figure if there is a calculation for working out how much water I would have to pump into a system to increase the pressure.

For example, I have a pipeline which is 2" and 6.5 km long. I worked the volume out using πr² × height so π×0.0254m²×6500m which is 13.17m³.

How do I now determine how much more water I require to increase the pressure to 10 barg?

I know the material of the pipeline matters but I am just looking for a ballpark not exact accuracy. I also know that temperature matters but for this case let's say the temperature remains constant again this is because I require a ballpark figure.

It is for a hydro test (pressure test) of the pipe. we are taking it up to 150% of its design pressure which is 414 barg so 621barg
 
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There are tables giving the density of water at different pressures. The difference between the two pressures allows to figure out how much water has to be added at constant volume. If your pipeline expands under pressure, this could be the dominant effect, then you have to know how much it expands.
 
mfb said:
There are tables giving the density of water at different pressures. The difference between the two pressures allows to figure out how much water has to be added at constant volume. If your pipeline expands under pressure, this could be the dominant effect, then you have to know how much it expands.

Do you know where can i Find these tables?
 
Google "water density table", "water density table pressure" or related things?
 
Another approach is to use the bulk compressibility of water, which is on the order of 5 x 10-4/MPa.

Chet
 

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