These pictures of SCUBA ( Self-Contained Underwater Breathing Apparatus ) tanks I took at Dakak Dive Shop in Dapitan, Zamboanga del Norte. There were no diving activities when I went there but I met Mr. Paul Jalosjos, the in-house Dive Master. It was pleasant meeting him and talked about his dive experiences and the dive industry in Philippines which is not so good in this part of the country inspite of the fact that they have one of the best dive spot in the country. He attributed this partly because only foreigners are into this sports and few pinoys are certified divers. This prompted me to research on this.. probably next time.
Well now, for the scuba tank commonly used in recreational dive is made of aluminum and holds 80 cubic feet of air compressed into an area of the tank which is 2 feet high and 6 inches in diameter. Please take note that it is compressed air and not oxygen as many think it is. The compressed air is almost the same as the air we breathe on tierra firma. The standard tank is filled with 2000 to 3000 psi ( pounds per square inch ) of air pressure. The usual dive time I have with 3000 psi is 45 minutes with only 100 psi remaining when I surfaced. Currently, Nitrox, a mixture of nitrogen and oxygen, prolongs bottom time but you take another PADI nitrox course that will teach you the advantages and limitations of Nitrox. As to the double tank, it usually used for extended dive time but is now rarely used, it is too cumbersome.
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