How can one determine the nature of flow viz. Constant flow or Pulsating flow without doing any calculation. Pl. explain this with examples. With the help of experience many operators can find the nature of fluid. At the design stage we only know its design conditions , moc , etc. but not the actual conditions.Pl. elaborate it.

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Regards
PME

Hi,
Pulsating flow is usually induced by irregular pressure variations or mechanical motions in channels, the examples can be found on internet. I don't know what you want to design, but I think calculation can't be missed for many cases, and this is also one of the reasons why engineers are important.

General question ==> general response...

Example could be reciprocating machine

I want to know about nature of flow so that I can decide the criterion while selecting manual valve.


Thanks !

If you have the design conditions,im sure the operating conditions are available with the process team.The maximum normal operating pressure & temprature are used in selecting design pressure/temp.Stream data available with the process team will give info regarding the state of the fluid...i.e liquid,vapor or 2-phase.You could also verify the nature of the fluid(Corrosive,neutral,Abrasive fines) from the process scheme and stream properties.
Im not sure i understand the question...but if you are selecting a manual valve..first find out if the block valve would be used purely for isolation purpose (On/Off),or for manual Control (modulating).Check the nature of fluid to deciede MOC..check for flashing across control valves,erosion etc.Im not sure what pulsating flow has to do with valve selection.

Thanks.