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Trimix scuba cylinder label IMCA Trimix cylinder shoulder colour code alternative IMCA Trimix cylinder shoulder colour code. Trimix is a breathing gas consisting of oxygen, helium and nitrogen and is used in deep commercial diving, during the deep phase of dives carried out using technical diving techniques, [1] [2] and in advanced recreational diving.
The difference in PO 2 can be used to calculate PHe, or conversely, a desired trimix product partial pressures can be used to calculate the PO 2 for the nitrox and trimix stages of the blend. Example: Desired product 50% helium, 16% oxygen, remainder nitrogen (34%). The PO 2 after the helium addition must be 0.16 bar if there is negligible ...
PHe at 50 m on the mix must therefore be (6 − 4) bar = 2 bar, so F He is 2/6 = 0.333 = 33% The remaining (100–(33+23)) = 44% would be nitrogen The resulting mixture is a trimix 23/33 (23% oxygen, 33% helium, balance nitrogen) These are optimum values for minimizing decompression and helium cost.
Heliair is a form of trimix that is easily blended from helium and air without using pure oxygen. It always has a 21:79 ratio of oxygen to nitrogen; the balance of the mix is helium. [3] [13] Hydreliox is a mixture of oxygen, helium, and hydrogen and is used for dives below 130 metres in commercial diving. [1] [3] [11] [14] [15]
During extended diving operations very large amounts of breathing gas are used. Helium is an expensive gas and can be difficult to source and supply to offshore vessels in some parts of the world. A closed circuit gas reclaim system can save around 80% of gas costs by recovering about 90% of the helium based breathing mixture.
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One with trimix diluent (O 2, N 2, He), the other with hydreliox (O 2, H 2, He). It was also the first hydrogen diluent dive in a cave. [6] Use.
Social media users reported to Brakeman that Chex Mix costs $12.99 or $14.99, but the spokesperson verified an actual cost of $5.99 for 8.75-ounce bags at three concourses.