Pressure / depth on-line calculator.

[robse]

Hi guys

I have added a small pressure / depth calculator to my site, that allows you to input any one of the seven options, and will calculate the other six for you.
That enables you to find the pressure at any given depth, the depth at any pressure, and to convert both depth and pressure measurements in between. There is also an option to download a small stand-alone HTM-file version of the calculator.

Hope you like it: http://www.robse.dk/pages/SSBN/WTCpreC.htm

[shadowpeo]

Very cool use for javascript,

Very cool use for javascript, well done

[gerwalk]

Robse,
to that calculated pressure

Robse,
to that calculated pressure you must add 1atm if you want the real pressure at any given depth. If not you are not taking into account the pressure due to the atmosphere. I'm right?

[robse]

Answer,

Hi

Yes.. if you wan't the absolute pressure. The calculator gives you the pressure in reference to the surface pressure. (Think it's called 'relative pressure'?) -or in other words, the pressure with the surface pressure as "zero"

Your WTC's and modules are sealed at sea level, which is at 1 atm. The pressure that the WTC / module has to endure is only the difference between the surface pressure, and the pressure at any given depth.
It is that pressure that the calculator helps you find.

You are correct that if you want the pressure in reference to zero pressure, you should add 1 atm. That number would only be interesting is you were to pump all air out of your modules after sealing them, and why do that.

In fact... if you were to pressureize your modules to say +1 or +2 atm in reference to sea level, then they could endure going even deeper..

[JWLaRue]

Rob,

Very nice...this will be quite

Rob,

Very nice...this will be quite useful.

The "relative pressure" that you refer to is also known as "psig" or psi gauge, where a reading of zero is equal to one atmosphere at sea level.

-Jeff

[gerwalk]

Thanks for the explanation! Excellent

Thanks for the explanation! Excellent tool!

[robse]

Thanks all,

.. and you're welcome. Glad to help and that it can be of use.