Simple choke CV question 1

[ColourfulFigsnDiags]

Choke CVs are normally quoted in units of gal/min/psi ... what type of gallons? Imperial or US?


Yet another reason to switch to metric ...

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[Unotec]

Where are you in the world and what industry might give you lead into that.
North America O&G is US gallons.
The best is for barrels UK/US, wine/dry/frderal/liquid/petroleum

Man! I love the metric system!!

<<A good friend will bail you out of jail, but a true friend
will be sitting beside you saying ” Damn that was fun!” - Unknown>>

 

[JLSeagull]

http://www.engineeringtoolbox.com/flow-coefficients-d_277.html

The engineering toolbox states us galons per minute. Cv of one passes one US gallon per minute per psi drop.

The flow capacity coefficient for SI units is Kv. See IEC 60534-1 or ISA 75.01.01. Table 1 in ISA 75 reflects various constants for the sizing equations for both Kv and Cv. People who spell colour instead of color use Kv.

 

[GrimesFrank]

JL,
Us Canucks speak out of both sides of our mouth......wait I mean we say 'colour', 'aboot' and Cv all at the same time.

Today is gone. Today was fun.
Tomorrow is another one.
Every day, from here to there,
funny things are everywhere. ~'Dr.' Theodor Geisel

 

[JLSeagull]

Ya, I too am workin' on a project near latitude 54 N where we write vapour, sulphur and use bothe Canadian and US standards.

 

[djack77494]

The metric system is great. What do you like best?
bara, bard, barg
kg(f)/cm^2 (a), kg(f)/cm^2 (d), kg(f)/cm^2 (g)
kPa(a), kPa(d), kPa(g)
cm H2O, or maybe
Torr
Lots of great choices.

 

[JLSeagull]

Bar is practical and kPa is SI. Include the absolute or gauge suffix. For really low ranges mm H2O is useful. kg is wrong for force and Torr sucks.

 

[MortenA]

I think that most people who actually uses Kv spell it "farben" - anyway Cv is always USgal.

But even most Germans would prefer the dimensionless k to Kv i think

Best regards

Morten

 

[ColourfulFigsnDiags]

Ummm djack we also use psia and psig, so I fail to see your point? Torr is not SI nor is it metric ... and as JLSegull pointed out, kPa is the SI measure.

Thanks for the answers guys!

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