Search found 57 matches

by PipeFlowCalcs
Sun Mar 04, 2012 11:23 pm
Forum: Flow calculators and fluid flow problems
Topic: flow straightener pressure drop
Replies: 3
Views: 12316

Re: flow straightener pressure drop

Pressure drop will be lower, for sure, but how much I can not tell exactly...
If you increase flow area - A by double, pressure drop will drop with A^2.5 = 2^2.5 = 5.65 times. This is very rough calculation as answer to your question, but I can not help more... (get from Darcy formula)
by PipeFlowCalcs
Wed Feb 29, 2012 7:44 pm
Forum: Flow calculators and fluid flow problems
Topic: Maximum gas flow calculation
Replies: 4
Views: 11149

Re: Maximum gas flow calculation

Pipe size can be calculate if: You know flow velocity or You know pressure drop through pipe. Also you should know fluid density. I expect that fuel gas is 0.78 m3/kg at normal conditions and lube oil is 850 kg/m3, but you have to confirm. You can use flow rate and pipe diameter calculator for your ...
by PipeFlowCalcs
Wed Feb 29, 2012 7:55 am
Forum: Flow calculators and fluid flow problems
Topic: flow straightener pressure drop
Replies: 3
Views: 12316

Re: flow straightener pressure drop

Calculation of pressure drop through pipe is easy, but pressure drop between pipes is something else, but pressure drop is the same through pipe and around it as after the strainer pressure is constant. In order to calculate pressure drop you must know not only geometry but also flow rate. It is pos...
by PipeFlowCalcs
Sun Feb 26, 2012 7:32 pm
Forum: Flow calculators and fluid flow problems
Topic: Lowest dp to maintain flow
Replies: 3
Views: 5762

Re: Lowest dp to maintain flow

You must have valve characteristics curve so you can know how that. When valve senses flow rate drop it will open itself, potentially to its maximum open position. In that case, if you do not have sufficient inlet pressure, or big enough pressure difference flow rate will not reach its maximum that ...
by PipeFlowCalcs
Sat Feb 25, 2012 6:49 pm
Forum: Flow calculators and fluid flow problems
Topic: Lowest dp to maintain flow
Replies: 3
Views: 5762

Re: Lowest dp to maintain flow

I guess that you are controlling pressure with control valve - is the purpose of control valve is to keep pressure after the valve constant, or controling something like flow rate or temperature? If you are controlling pressure, than control valve will open once the pressure after it is lower than o...
by PipeFlowCalcs
Sun Feb 19, 2012 10:32 pm
Forum: Flow calculators and fluid flow problems
Topic: max flowrate for natural gas
Replies: 5
Views: 18940

Re: max flowrate for natural gas

When you say 60 kg/m3 you mean that is the density on real conditions at 70 bar? In natural gas calculator Renouard equation is used. There is used density at standard conditions (t=15 C, p=101325 Pa) which is about 0.78 kg/m3, for most common gas composition and I think that minor changes of densit...
by PipeFlowCalcs
Sat Feb 18, 2012 3:49 pm
Forum: Flow calculators and fluid flow problems
Topic: max flowrate for natural gas
Replies: 5
Views: 18940

Re: max flowrate for natural gas

Here is the report that I have with natural gas flow calculator : Compressible natural gas flow calculator 1. volumetric flow rate (q): q : 361666.66 m3/h 2. mass flow rate (w): w : 217000 kg/h 3. length (L): L : 800 m 4. diameter (D): D : 12 in 5. density (ρ): ρ : 0.60 kg/m3 6. temperature (T): T :...
by PipeFlowCalcs
Fri Feb 17, 2012 6:51 pm
Forum: Flow calculators and fluid flow problems
Topic: Problem with on-line calculator
Replies: 3
Views: 7489

Re: Problem with on-line calculator

Try to update Java. Also I think in internet explorer you have to allow Java to run - it should ask you...
by PipeFlowCalcs
Thu Feb 16, 2012 3:33 pm
Forum: Flow calculators and fluid flow problems
Topic: water flow throgh a new valve?
Replies: 1
Views: 4860

Re: water flow throgh a new valve?

Every valve has different pressure drop curve and it is not possible to know maximum flow if valve resistance coefficient K is not known. Maximum possible flow through 15 mm orifice can be calculated and it is for 3 bar differential pressure of water using orifice plate calculator : Orifice plate ca...
by PipeFlowCalcs
Wed Feb 08, 2012 10:58 pm
Forum: Flow calculators and fluid flow problems
Topic: exit flow under water/in open air
Replies: 2
Views: 5483

Re: exit flow under water/in open air

You will also have the pressure of 1m water on the pipe exit in vertical pipe. It is about 1/10 atm pressure or 10132.5 Pa, that the flow of water will have to over come and flow will because of that be lower.