Search found 375 matches

by admin
Sun Apr 07, 2013 9:24 am
Forum: Flow calculators and fluid flow problems
Topic: CYLINDER LEAK DOWN TESTER
Replies: 13
Views: 23952

Re: CYLINDER LEAK DOWN TESTER

Pressure is dropping not only due to change in pipe diameter but also due to local reistance losses in restriction and friction in pipe. In Bernolli equation flow is considered with no energy loss, but in real system it is not the case. Because of that you must add parts of equation that takes care ...
by admin
Sat Apr 06, 2013 9:57 pm
Forum: Flow calculators and fluid flow problems
Topic: CYLINDER LEAK DOWN TESTER
Replies: 13
Views: 23952

Re: CYLINDER LEAK DOWN TESTER

Air in pressurized cylinder is heated due to compression, but while going through restriction it is cooled due to sudden drop in pressure.
by admin
Sat Apr 06, 2013 3:17 pm
Forum: Flow calculators and fluid flow problems
Topic: CYLINDER LEAK DOWN TESTER
Replies: 13
Views: 23952

Re: CYLINDER LEAK DOWN TESTER

On the other hand I don't know how did you get K=10000? It is well known that for pipe entrance K=0.5 and for pipe exit K=1.0 for pipes with sharp edges. As the pipe length is very small, flow can be considered as adiabatic as there is not enough time to exchange heat with surroundings. That high sp...
by admin
Fri Apr 05, 2013 8:28 pm
Forum: Flow calculators and fluid flow problems
Topic: CYLINDER LEAK DOWN TESTER
Replies: 13
Views: 23952

Re: CYLINDER LEAK DOWN TESTER

what you are measuring is actualy pressure difference in front and after 1 mm orifice - am I right? So with discharge calculator you can calculate how much air is flowing through discharge orifice. I here show my results for 5 bar pressure drop over 1 mm pipe with 6 mm length and K = 1.5 for entranc...
by admin
Tue Apr 02, 2013 6:48 pm
Forum: Flow calculators and fluid flow problems
Topic: Vacuum Relief Valve Sizing
Replies: 2
Views: 9107

Re: Vacuum Relief Valve Sizing

You must know how "quickly" it is in order to calculate flow rate of air required and pipe diameter needed for it. When you know time t that is needed to drop temperate from one point to another you can calculate how much volume ( V ) is changing in that time and from there you have flow r...
by admin
Sat Mar 30, 2013 2:28 am
Forum: Flow calculators and fluid flow problems
Topic: velocity to pressure??
Replies: 4
Views: 8666

Re: velocity to pressure??

dan-g wrote: ΔP=f(L/D)((ρv^2)/2)
+ ((ρv^2)/2) due to pipe exit. Correct formula it is!
by admin
Fri Mar 29, 2013 9:54 pm
Forum: Flow calculators and fluid flow problems
Topic: velocity to pressure??
Replies: 4
Views: 8666

Re: velocity to pressure??

How is you system looking? Do you have one point where two pipes start and air exits to atmosphere? If so than you have two parallel lines with same pressure drop (pressure change) from the start to the finish and for that equal pressure difference two flow rates are established - which you can use ...
by admin
Fri Mar 29, 2013 9:50 pm
Forum: Flow calculators and fluid flow problems
Topic: Flow rate through an orfice plate
Replies: 1
Views: 5293

Re: Flow rate through an orfice plate

You are right.
you can try also orifice free calculator
by admin
Thu Mar 28, 2013 8:45 am
Forum: Flow calculators and fluid flow problems
Topic: Help Please: Viscous Oil Flow Rate
Replies: 5
Views: 15085

Re: Help Please: Viscous Oil Flow Rate

I see... That is non statinary flow as you have pressure change over time so none of calculators availble on pipeflowcalculations.com is covering that problem. But in the near future it would be good to do one as many asks for tool that will solve similar problem. The problem is also that fluids tha...
by admin
Mon Mar 25, 2013 8:30 pm
Forum: Flow calculators and fluid flow problems
Topic: CYLINDER LEAK DOWN TESTER
Replies: 13
Views: 23952

Re: CYLINDER LEAK DOWN TESTER

Thank you for your data, but I suggested you to use GAS DISCHARGE CALCULATOR and not isothermal just to check from the other point of view.
Your experience with tester for sure will be of interest for others as well as for me also.