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>Most (not all) of the dive shops in this area that pump nitrox. Do not want >to pump O2 into a tank that may have air (20.9% O2, 79.0% N2) from a >contaminated source. The dive shop that also pump Nitrox are pumping >"N-Grade" >air, not E-Grade, or J-Grade. They feel E-Grade air should not be used for >nitrox, or gas blending. At one time they would check your tank to make >sure >it doesn't contain normoxic air. They feel if a tank is labeled nitrox it >should be used for nitrox only. They look for a O2% of greater than 25%. Can someone explain the compressor rating system to me? I know what they test for, but what is N-grade compared to E-grade and so on. Which is the best and worse? I assume that N-grade is the best? Also what is wrong with filling a Nitrox tank with air as long as it is filled with the acceptable rated compressor at a nitrox station. After all, they put air on top of the pure O2. I was taught it was OK to dive air from a nitrox tank as long as it was filled at a nitrox station. What is the general rule everywhere else, I know many people that do this here in Hawaii. Aloha, Tony ANTHONY MONTGOMERY Marine Option Program Waikiki Aquarium 1000 Pope Road MSB #203 2777 Kalakaua Ave Honolulu, Hawaii 96822 Honolulu, Hawaii 96815 Fax: (808) 956-2417 Fax: (808) 923-1771 Phone: (808) 956-6000 Phone: (808) 923-9741
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