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Pressure drop in a pipe changes with varying pipe length, pipe diameter and volume flow. 
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Pressure drop in a pipe changes with varying physical properties and roughness of the inner pipe surface? 

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Pressure drop in straight piping, in a 90° bend, pressure drop in valves, filters, heat exchangers etc. 
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Check where your system curves and pump curves meet best for your point of operation. 
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Start the pressure drop calculation of your plant with an interactive flow sheet: pump below or above liquid, filling from the top or the bottom, closed loop. 
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Up to 3 system curves: how does pressure drop in your piping change with varying volume flow, storage levels, surface roughness,
pyhsical properties (density, viscosity) and/or different designs of piping, valves, filters, heat exchangers etc. 
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Up to 5 pump curves: compare different pump types and models. Further options are
pumps in series, pumps in parallel and the variation of speed. 

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Determine the influence of pipe diameter and insulation (thickness, thermal conductivity, thermal bridges) on the heat transfer. 
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How does the insulation of your piping behave with varying ambient temperatures and wind speed? 
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Check the perfomance of your pipe insulation once the liquid stopped flowing. 

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Determine the pipe span. How do pipe material and medium influence the pipe span? 
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What will be the value of the maximum deflection of your pipe? 

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Density, dew point, enthalpie and much more dending on temperature, pressure and relative humidity. 
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Calculation of two stes of parameters at constant mass flow of dry air. 
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Wet bulb temperatur: calcultion, explanation and derivation. 
