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How to convert kPa to litres per minute

Updated March 23, 2017

Mathematician Daniel Bernoulli derived an equation linking pressure in a pipe, measured in kilopascals (kPa), with a fluid's flow rate, measured in litres per minute. According to Bernoulli, a pipe's total pressure is constant at all points. Subtracting the fluid's static pressure from this total pressure therefore calculates any point's dynamic pressure. This dynamic pressure, at a known density, determines the fluid's velocity. The flow rate, in turn, at a known pipe cross-sectional area, determines the fluid's flow rate.

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  1. Subtract static pressure from the total pressure. If the pipe has a total pressure of 0.035 kPa and a static pressure of 0.01 kPa: 0.035 - 0.01 = 0.025 kPa.

  2. Multiply by 2: 0.025 x 2 = 0.05.

  3. Multiply by 1,000 to convert to pascals: 0.05 x 1,000 = 50.

  4. Divide by the fluid's density, in kilograms per cubic meter. If the fluid has a density of 750 kilograms per cubic meter: 50 / 750 = 0.067

  5. Find the square root of your answer: 0.067 ^ 0.5 = 0.26. This is the fluid's velocity, in meters per second.

  6. Find the square of the pipe's radius, in metres. If it has a radius of 0.1 metres: 0.1 x 0.1 = 0.01.

  7. Multiply your answer by pi: 0.01 x 3.1416 = 0.031416.

  8. Multiply your answer by the answer to step five: 0.031416 x 0.26 = 0.00817 cubic meters per second.

  9. Multiply by 1,000: 0.00833 x 1,000 = 8.17 litres per second.

  10. Multiply by 60: 8.17 x 60 = 490.2 litres per minute.

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About the Author

Ryan Menezes is a professional writer and blogger. He has a Bachelor of Science in journalism from Boston University and has written for the American Civil Liberties Union, the marketing firm InSegment and the project management service Assembla. He is also a member of Mensa and the American Parliamentary Debate Association.

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