Technical and Scuba Diving Dive Gas Blending App for Nitrox and Trimix | iMixer by Arcinsight Solutions

 

Technical Diving Scuba App for Blending Nitrox & Trimix

 

 

 

 

 

 

 

Scuba Gas Blending App for blending Nitrox and Trimix for Technical Diving

Nitrox and Trimix Dive Gas Blending App for Technical Scuba Diving

Dive Gas Blending App for blending Nitrox and Trimix for Scuba Diving

EANx Technical Scuba Diving App for blending Nitrox and Trimix

Scuba Diving App for Dive Gas Blending of Nitrox and Trimix for Technical Diving

Technical Diving Gas Blending App for blending Nitrox and Trimix for Scuba Diving

 

 

 

Best Technical Dive Gas Blending App for Nitrox and Trimix - iMixer

 

 

 

 

 

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iMixer Calculations

 

iMixer can generate blending plans using both ideal and real gas calculations. Many gasses follow the ideal gas law very closely at low pressures. As gas pressures increase blending calculations using the ideal gas law begin to loose a little accuracy.  This is because no gas is truly ideal. In most cases the difference in blending plans created using ideal gas verses real gas calculations fall within an acceptable margin of error. iMixer provides both sets of calculations.

 

The Ideal Gas Law describes the relationships among the four variables temperature (T), pressure (P), volume (V), and moles of gas (n):

 

                p V = n R T

 

                p = absolute pressure (not gauge pressure)

                V = volume

                n = amount of gas (moles)

                R = ideal gas constant

                T = absolute temperature (Kelvin)

 

Real gas laws try to predict the true behavior of a gas by putting in terms to describe attractions and repulsions between molecules. One real gas law is the van der Waals equation:

 

[P + (n2a/V2)](V - nb) = nRT

 

P - pressure

V - volume

n - number of moles

T temperature (Kelvin)

R -  ideal gas constant

 

The first parameter, a, is approximates the attractive forces between molecules while the second parameter, b, is approximates the repulsive forces. Tables for a and b values for a specific gas can be found in many Chemical Engineering textbooks.

 

If the units of P, V, n and T are atm, L, mol and K, respectively, the metric value of R is 0.0821 while the imperial value is 10.73159. The constants a and b for N2 is 1.408 and 0.03913. For Othe a and b constants are 1.378 and 0.03183. For He they are 0.03457 and 0.0237.

 

To calculate the volume of a real gas, V in term n2a/V2 can be approximated as: nR/T (from the ideal gas calculation). Volume and pressure can be calculated with these formulas:

 

V = nR3T3/(PR2T2+aP2) + nb

 

P = nRT/(V - nb) - n2a/V2

 

Calculations using the ideal gas law can be performed in units of pressure (PSI, BAR) or volume (FT3, L3).  Computations are simple and easy to validate. Calculations using the van der Walls equation are performed using quantity of gas (mols).

 

Due to the correction factors a and b approximating the attraction and repulsion of molecules the process of producing a blending plan is a little more complex. We start by figuring out the quantity of the O2, N2, and He components of the starting gas. We then calculate the quantity of gas (in mols) to be added at each step in the process using either O2, He, bank gas, or top off gas. After adding gas at each step we recalculate the pressure and continue adding gas until we reach our target.

 

A good source for information on real and ideal gasses can be found at SoftChemistry online (www.molecularsoft.com).

 

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App for blending dive gases Nitrox & Trimix for Technical Scuba Diving

 

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