Dear,
I'm trying to check maximum flowrate through a pipe and got the following parameters:
pipe, DN-25
P1 = 60 barg
P2 = 46,3 barg
medium, natural gas at 25°C, ie. density at 60 barg = 43,5 kg/m³
I used the formula out of PRENSAP B6.1.2:
W = (rho*Di^5*(P1-P2)/0,81*lambda*L)^0,5
How come I always come up with the same average velocity in m/s, regardsless which Di I choose?
Thanks in advance for all your answers.
Agnes
|
Formula For Maximum Flow Through Pipe
Started by Guest_FrankSchleck_*, Aug 07 2008 08:32 AM
3 replies to this topic
Share this topic:
#1 Guest_FrankSchleck_*
Posted 07 August 2008 - 08:32 AM
#2
Posted 07 August 2008 - 09:17 AM
Agnes:
I don't know what "PRENSAP B6.1.2" is, but I do know that in order to find the flow rate of a compressible fluid through a circular pipe, you have to establish:
the pipe diameter;
the driving force (pressure drop);
the pipe length;
the fluid properties (viscosity, density, temperature);
the number and type of fittings and valves - and all other resistances;
the friction factor.
Your question involving the velocity is vague and doesn't tell us what equation or method you are obviously using wrongly. We can't answer your question if you don't tell us what relationship or tools you are using to come up with the wrong answer(s). Your answers are wrong because the average fluid velocity is going to definitely going to change with the diameter varying.
We can't give you an answer based on what information you furnish.
Additionally, just specifically what is your query? Is it the formula for the max flow rate? Or is it the velocity question? --Or both?
I don't know what "PRENSAP B6.1.2" is, but I do know that in order to find the flow rate of a compressible fluid through a circular pipe, you have to establish:
the pipe diameter;
the driving force (pressure drop);
the pipe length;
the fluid properties (viscosity, density, temperature);
the number and type of fittings and valves - and all other resistances;
the friction factor.
Your question involving the velocity is vague and doesn't tell us what equation or method you are obviously using wrongly. We can't answer your question if you don't tell us what relationship or tools you are using to come up with the wrong answer(s). Your answers are wrong because the average fluid velocity is going to definitely going to change with the diameter varying.
We can't give you an answer based on what information you furnish.
Additionally, just specifically what is your query? Is it the formula for the max flow rate? Or is it the velocity question? --Or both?
#3
Posted 07 August 2008 - 10:02 AM
Hi Agnes,
I am putting an attachment on compressible flow through pipelines. It is a very informative article on compressible flow covering the various equations such as AGA, Weymouth, Panhandle A & B etc.
Maybe some of the young engineers who are whiz kids in writing "Visual Basic" programs in excel can utilize this article to prepare a spreadsheet and share it with the forum readers.
Regards,
Ankur.
I am putting an attachment on compressible flow through pipelines. It is a very informative article on compressible flow covering the various equations such as AGA, Weymouth, Panhandle A & B etc.
Maybe some of the young engineers who are whiz kids in writing "Visual Basic" programs in excel can utilize this article to prepare a spreadsheet and share it with the forum readers.
Regards,
Ankur.
#4
Posted 07 August 2008 - 12:04 PM
The PRENSAP formula you used is for liquids. It's the same formula from DEP 31.38.01.11 (formula 3a). In the DEP it says you can't use it for compressible flow. If you want to calculate the maximum flow through the pipe for a number of diameters i suggest you use Crane Technical Paper 410M (equation 3-20 and page A-22).
Similar Topics
Flow Switch High RangeStarted by Guest_Lyne_* , 11 Apr 2024 |
|
|
||
Kettle Reboiler Flow FractionsStarted by Guest_Lyne_* , 31 Mar 2024 |
|
|
||
Mtbe Process Flow Diagram Master Thesis.Started by Guest_sayoub_* , 15 Feb 2024 |
|
|
||
Duplication Of Psv And Flow Rate For Exchanger Tube Rupture ScenarioStarted by Guest_Platonicus_* , 11 Mar 2024 |
|
|
||
Firewater Theoretical Vs Actual FlowStarted by Guest_stu_* , 25 Feb 2024 |
|
|