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Online Units Conversion

Heat Transfer

Fluid Flow

Vessels

Filtration

Physical Properties

Financial Calculators

 

There are many useful design tools to be found on the internet and I have no intention of writing new ones. However, here are links to those that I have found most useful. This does not, of course, imply any endorsement or accept any liability for errors incurred in their use.

Look at the CHE Resources Free Software page for a good reference source of on-line calculators. Other good sources include the Process Associates, Jahar,  Efunda and Freecalc sites (all referenced on CHE) Spirax Sarco and Engineers Edge.

Online Units Conversion

Heat Transfer

Fluid Flow

  • Reynolds Number This calculator quickly gives you the Reynolds Number for a flow over a plate or a flow in a pipe.
  • Pipe Friction This calculator  tells you the Reynolds number, pressure drop, and flow rate for a constant cross-section pipe.
  • Venturi Flowmeter This calculator outputs the flowrate through a venturi constriction for a given pressure drop.
  • Applications from Freecalc
  • On-Line Friction Piping Loss Rigorous calculation of the pressure loss for flowing liquids, based on liquid properties, flow, and piping configuration (pipe length, fittings, and valves). Results can be printed out or "cut and paste" into other applications.
  • On-line Compressible Flow Pressure Loss Rigorous calculation of the pressure loss for flowing gases, based on as properties, flow, and piping configuration (pipe length, fittings, and valves). Results can be printed out or "cut and paste" into other applications.
  • On-Line Liquid Friction Loss for any Pipe Size This application determines the pressure loss due to friction in any sized straight pipe or tube. This is useful when dealing with very small piping or tubing or for flow though small channels. This application is only applicable for straight pipes, and cannot accommodate losses due to fittings and valves (it does include inlet and outlet losses though). If standard sized piping is being used then the application above "On-Line Friction Piping Loss" should be used.
  • On-Line Gas Friction Loss for any Pipe Size This application determines the compressible gas pressure loss due to friction in any sized straight pipe or tube. This is useful when dealing with very small piping or tubing or for flow though small channels. This application is only applicable for straight pipes, and cannot accommodate losses due to fittings and valves (it does include inlet and outlet losses though). If standard sized piping is being used then the application above "On-line Compressible Flow Pressure Loss " should be used.
  • Design of Self-Venting Piping How to size piping that is self-venting for vertical pipes, and side outlet applications.
  • Open Channel Flow in Circular Pipe Open channel flow in pipes based on Manning's Equation.
  • Gas Density Calculator Gas density and specific volume calculation based on system conditions and compressibility factor.
  • Flow coefficients for flow through valves - water and steam
  • Pipe sizing for steam and condensate flow
  • Orifice sizing from flow rate and flow coefficient

Vessels

  • Determining Volumes in Partially Filled Vertical Vessels This application calculates the partial volumes of vertical vessels with Ellipsoidal, Hemispherical, Flat, or Conical heads
  • Draining Time for Vertical Tanks Determination of the time it takes to drain a vertical tank including the resistance of the outlet piping. This program calculates the draining time between any two levels in a vessel with a flat, elliptical, or hemispherical bottom head.
  • Heat Loss from vertical, horizontal and rectangular tanks
  • Wall thickness of pressure vessels - shell and ellipsoidal end

Filtration

Physical Properties

Financial Calculators

  • Loan Calculator This calculator takes any two of the three variables (Loan, Interest Rate, and Number of months) and gives the answer for the remaining one
  • APR Calculator This calculator gives a full definition of APR and helps you determine it for a given interest rate and points cost.