## Search found 365 matches

Thu Jul 31, 2014 7:54 am
Forum: Flow calculators and fluid flow problems
Topic: Rate of flow for an open pipe under pressure
Replies: 3
Views: 5280

### Re: Rate of flow for an open pipe under pressure

You must know pipe length and position and size of branches if you have any.
Fri Jun 13, 2014 11:16 pm
Forum: Flow calculators and fluid flow problems
Topic: Error in Sudden and Gradual Contraction K Factor?
Replies: 1
Views: 3816

### Re: Error in Sudden and Gradual Contraction K Factor?

Well spotted, thank you for correction!
I have just made change in calculator and theory page itself.
Wed Jun 11, 2014 10:37 pm
Forum: Flow calculators and fluid flow problems
Topic: How to calculate vertical pipe flow
Replies: 1
Views: 3782

### Re: How to calculate vertical pipe flow

You can use height difference as available head in calculator, ie p1 = rho * g * h + 101325 Pa, p2 = 101325 Pa.
Sat May 03, 2014 12:41 am
Forum: Flow calculators and fluid flow problems
Topic: Roughness...
Replies: 2
Views: 5380

### Re: Roughness...

Roghness really depends on the level of surface treatment for new pipes and corrosion level for old ones. It can be anything up to 1 mm depending on the pipe itself.
Wed Apr 30, 2014 10:57 pm
Forum: Flow calculators and fluid flow problems
Topic: Calculating Pressure Vs. Time While Filling Tank
Replies: 2
Views: 16686

### Re: Calculating Pressure Vs. Time While Filling Tank

You can look at post here: http://forum.pipeflowcalculations.com/viewtopic.php?f=3&t=10 This is similar problem as yours, but not exactly the same. Your equation is I think correct but have to clarify some abbrevations used: Vt - is volume of tank MWair what is for? rho * V * A = G = dm/dt is mass f...
Tue Apr 29, 2014 11:24 pm
Forum: Flow calculators and fluid flow problems
Replies: 1
Views: 3637

### Re: question about pipe flow

You can't calculate flow rate with data you provided. You have to know more. Regulator should keep outflow pressure at constant value regardless of inlet pressure and flow rate, so for any flow rate pressure should be at set point, if flow is within regulator capacity. If your question is how much g...
Wed Apr 23, 2014 10:12 pm
Forum: Flow calculators and fluid flow problems
Topic: Reducing pressures with Orifice Plates
Replies: 5
Views: 5343

### Re: Reducing pressures with Orifice Plates

Calculator gives option for enter either density or temperature. If you choose to enter density, than calculator using R is calculating T prior to other calculation is done. I can't tell you about pipe roghness you should use. I think that it is the best way to be on safe side and choose values of p...
Mon Apr 21, 2014 8:39 pm
Forum: Flow calculators and fluid flow problems
Topic: Reducing pressures with Orifice Plates
Replies: 5
Views: 5343

### Re: Reducing pressures with Orifice Plates

Kappa is for expansion factor ISO 5167 - Y for orifices, you have it in the right middle of this page: http://www.pipeflowcalculations.com/pipe-valve-fitting-flow/flow-in-valves-fittings.php R is simply used for calculations between rho, T and p in ideal gas state equation, depending on user inputs....
Sun Apr 20, 2014 12:25 pm
Forum: Flow calculators and fluid flow problems
Topic: Calculating Air Flow on exit of pipe where inlet is orifice.
Replies: 1
Views: 3562

### Re: Calculating Air Flow on exit of pipe where inlet is orif

I think that with orifice calculator you can calculate it easily.
http://www.pipeflowcalculations.com/orifice/
Fri Apr 18, 2014 11:03 pm
Forum: Flow calculators and fluid flow problems
Topic: Reducing pressures with Orifice Plates
Replies: 5
Views: 5343

### Re: Reducing pressures with Orifice Plates

Hello, Gas constant for CO2 is R=189 J/kgK and k=kappa=Cp/Cv=1.3 for CO2. These values are needed for calculation. You have table at: http://www.pipeflowcalculations.com/tables/gas.php . I suggest you to use check button with "use ISO constraint" just to be sure if calculation is within its purpose ...