Tank Pressure Conversion

[KierenConnell]

Hey,
Im kind of new to SCUBA diving, me and my brother have gauges but one is in PSI and the other is in K.Pa. Just wondering if there is an easy way to convert these two to Bar so we can have the same measurements in our dive logs?
Many Thanks
Kieren

 

[scuubaadoo]

divide the psi reading by 15 to get a very close aproximation, 14.7 to get closer. I believe K Pa = Bar, but I may be wrong (and I am sure ppl will be happy to point that out ). Hope this helps, and welcome to the world of diving

 

[Luis H]

1 Atmosphere (standard) = 14.696 psi

1 Bar = 14.5038 psi

1 Kilo Pascal (kPa) = 0.145038 psi

1 Bar = 100 kPa


You can down load a very good unit conversion program from this web site:
http://www.engnetglobal.com/tips/toolsapp/default.aspx

 

[KierenConnell]

I dont understand how that works. With one of our tanks there is 2400 PSI and then if we do it again with the other gauge we get 16KpA. Unless my math is wrong, those conversions dont work and the website is wrong too.

KierenConnell

 

[Meng_Tze]

I dont understand how that works. With one of our tanks there is 2400 PSI and then if we do it again with the other gauge we get 16KpA. Unless my math is wrong, those conversions dont work and the website is wrong too.

KierenConnell

2400 PSI = 2400/14.7 = 163 BAR

1 BAR = 100 KPa
convert BAR to KPa = factor 100. Thus 163 BAR is 163*100 = 16300 KPa = 16.3 MPa

check calculation:
16300 KPa * 0.145 = 2363 psi

your 16KPa is a factor 1000 off.

The small differences are rounding/reading/other errors

Please bear in mind that this conversion only works if you both use the same tanks (volume) if not, you need to calculate by volume (cft / liters)

 

[ianw2]

http://www.teamfc3s.org/calc/convert_pressure.php is a source for another converter.

Based on my calcs (by hand from factors from CRC Handbook), I get:

2400 psi = 165.474168 bar
165.474168 bar = 16547.4168 kPa

and back the other way:

16 kPa = 0.16 bar
bar = 2.320608 psi

Off hand, is your kPa gauge an analog gauge? Does it have a note on the face that the readings are to be multiplied by 1000 to get the correct value?

Ian

 

[Meng_Tze]

BTW I have not seen a spg in kPa..... mostly it is BAR or PSI

 

[JDog]

My calculation is different, Title it "Math made easier"
Open wallet-- buy a couple of spg's that have the same value.
I think it is much less painful in the long run.


It is nice to know that there are some folks who can do the math, I'm just not one of them. I'd have to quit diving if I had to figure that out before every dive.

 

[String]

BTW I have not seen a spg in kPa..... mostly it is BAR or PSI

No but ive seen some equipment (and texts) that hopelessly confuse the 2 and mislabel.

 

[captndale]

Converting from one measurement to another on the surface is a rather straight forward calculation. However, underwater it is another thing altogether. Confusion among members of a dive team / buddy team over such an important thing as gas pressure can have serious consequences. I would strongly recommend that one of you trade spg's with someone else so that you both are using the same units of measure.