Big issue here is Pump efficiency, which is defined as ratio of power we get out of the pump to the amount of power we are putting into the pump. Survey among popular pump brand shows that efficiency of the pump is in range of 40-90%. Seems that efficiency is related to "speed number" and dropping if speed number is below 1000. Wear of sealing elements inside pump housing affect efficiency.
Default efficiency, used in script, is 0.6. Vapor pressure data for few fluids can be found [here](https://github.com/ddjokic\Headloss in Pipe\Fluids.md).For cavitation not to occur, minimum pressure on suction side should be grater that vapor pressure of the liquid at operation temperature. Script calculates minimum pressure and compare it with vapor pressure (user defined).
Useful if one needs Pump Curve H-Q equation, based on given points - eg. maker's graph. As characteristic of centrifugal pump is parabola, at least three points should be provided. More points - better fit.
Recalculates Delivery, Head, Efficiency and Power of the centrifugal pump from Water Viscosity, usually provided by the maker, to real pumped fluid using Hydraulic Institute standards.
There are two files:
- viscoservice-US.py using US Customary Units - gpm for flow and feet for head;
- viscoservice-M.py using metric units - cum/h for flow and meter for headloss
Make sure that you are using right template file for your unit system - m for metric and us for US system. Input file should be in csv format.
Results are written in input file - file is appended.
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