How to Calculate Back Pressure in a 24" Sparge Pipe?

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SUMMARY

The discussion focuses on calculating back pressure in a 24" sparge pipe designed for transporting hot water at a flow rate of 3010 m³/hr over a distance of 60 ft. Key considerations include determining whether the flow is laminar or turbulent and utilizing specific equations for back pressure calculations. A reference to an Excel-based back pressure calculator from Harco Manufacturing was mentioned, which contains unique equations not commonly found online. The outlet pressure is considered atmospheric, leading to the conclusion that back pressure at the pump end equals the pressure drop along the pipe plus atmospheric pressure.

PREREQUISITES
  • Understanding of fluid dynamics, specifically laminar and turbulent flow.
  • Familiarity with back pressure calculations in fluid transport systems.
  • Knowledge of pipe flow equations and pressure drop calculations.
  • Experience with using online fluid mechanics calculators.
NEXT STEPS
  • Research the principles of laminar vs. turbulent flow in fluid dynamics.
  • Learn how to calculate pressure drop in pipes using the Darcy-Weisbach equation.
  • Explore the use of the Harco Manufacturing back pressure calculator for practical applications.
  • Investigate additional online resources for fluid mechanics calculations, such as eFunda.
USEFUL FOR

Engineers and designers involved in fluid transport systems, particularly those working on projects related to rotary breakers and sparge pipes, as well as anyone interested in optimizing fluid flow and pressure management in industrial applications.

subbby
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Hello All,

Problem Statement :
  • This is for design of a 24" sparge pipe for transporting hot water (85 deg C) for over 60 ft.
  • Asked to calculate the Back pressure

Data :
  • Liquid in the pipe: water
  • Flow rate : 3010 m^3/hr = 0.83611 m^3/sec
  • Pipe Dia : 24" = 2.032 mts
  • No elbows throughout 60 ft length


How do I go about this calculation ?
  1. Do I first find out if its laminar flow or turbulent flow
  2. How to arrive at back pressure equations ?
  3. Found a link "www.harcomanufacturing.com/docs/Backpressure%20CalculatorP.xls" : that gives an equation which I have never come across in any internet searches before. Is that how Back pressure is calculated

Background of the problem:
This is for a Rotary Breaker project where we have a 24" Sparge Pipe that is sprays hot water onto the huge chunks of solids being processed inside a rotary breaker. Rotary breakers belong the screening family ; where the machine breaks the solids inside a giant cylindrical section (this project ; 16ft Dia) and keep screening the materials as the go forwards in length. Water is used to form a semi slurry state to help fascilitate the breaking
 
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