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Pipesys (In Hysys) Cannot Comprehend Pressure, Temperature & Veloc

hysys pipesys

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#1 IonCube

IonCube

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Posted 15 October 2017 - 02:20 PM

I am having a problem comprehending HYSYS simulation results. Its a basic PIPESYS case involving three pipe segments of various lengths & at different elevations (sketch is included). The outcome of three scenarios where only pipe DIA are changed is collectively shown in the graph.

 

What I fail to understand are results produced by the last scenario (3in Sch.40). The velocity profile & the pressure profile are but bizarre, when compared with first two scenarios? The stream in question is total Gas.

 

I am attaching the case file as well if someone want to reproduce results https://www.mediafir...w3hm32/uk_2.hsc

 

My second question is if a pipe dia is increased wont there be greater cooling (heat loss) for the full length of pipe profile, but HYSYS simulation result is odd here too?

HsjCKl8.png

starting temperature for both were 45C, above are the final results.

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#2 Bobby Strain

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Posted 15 October 2017 - 04:27 PM

Maybe you can attach images that we can actually see the values in the graphs. And include density in your summary. Show both inlet and outlet conditions.

 

Bobby



#3 IonCube

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Posted 16 October 2017 - 06:10 AM

Thanks for replying

I have created two PDFs one for 4in & the other 3in. Each file contain Inlet, Outlet, Composition & Overall Summary from pages 1-3 ...then from page 4-7 there are graphs only with visible values

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#4 Bobby Strain

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Posted 16 October 2017 - 10:56 AM

I don't see anything unusual about the profiles. The "strange" behaviour of the 3" case is due to the significantly greater frictional pressure loss. And the higher velocity in the smaller pipe results in a greater inside heat transfer coefficient. So, all the HYSYS results are as expected.

 

Bobby



#5 IonCube

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Posted 17 October 2017 - 05:28 AM

Thank you bobby I understand you. Now can you tell me of any alternative way if I want to introduce a u-bend in  a pipe at same elevation I cannot achieve this in PIPESYS extension. 






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