Why Buy BIG SCUBA TANKS ** Want to Dive Longer ??

[Music] big tank little tank we're gonna be talking about why you would use big tanks it's coming right up if you get cold on the 30-minute dive when you're using an 80 cubic foot tank just think about how cold you're gonna be if you start using a 120 a 117 or a 133 in addition to that you have to pay attention to your no decompression limit so these big tanks are usually used by people that are nytruck strength and of course people who need to stay down there now who would that be that could be folks that are big into spearfishing folks that are big into checking out wrecks artifact diving things along those lines hull inspections or whatever it may be in a commercial application so let's talk about these three tanks now what I've got in front of me here is I've got a steel 120 that's a hundred and twenty cubic feet I've got a 117 cubic foot tank right here and this is a 133 now it's quite interesting because if you look at this tank this tank is 24 inches tall this tank is 26 inches tall and this tank is 29 inches tall so if you're one of those people that may be challenged your your torso is short then if you're looking for a tank with more more cubic feet of air then you're probably not going to want to use one like this 120 that's so tall and long you're probably going to want to go with something shorter like a 117 now in addition to that there's some differences in the diameter of these tanks the 120 this is a seven and a quarter inch diameter tank both of these are eight inch diameter tanks so you're gonna have to do some adjusting with your BCD to accommodate these tanks they will work but just remember you're going to have a larger tank on your back and you're gonna feel that weight it's gonna make you want to roll from side to side so there's there's gonna be a difference in that let's talk about the specs on these tanks let's start right here with the high pressure one seventeen like I said before this is an 8 inch diameter tank this tank when it's full weighs negative nine point one two pounds so you'll be negatively buoyant a little bit over nine pounds now as we go to these larger tanks this is what you're going to notice as they begin to get empty these tanks will become positively buoyant whereas if you remember in the other video when we were talking about the compact 80 and the high pressure 100 those remain negatively buoyant full or near empty so this tank the 133 excuse me the 117 is about a half a pound point six positively buoyant so to give you some understanding this tank weighs thirty eight point nine pounds let's jump over here to the 133 now the 133 it is nine a little bit over nine nine point zero eight pounds negatively buoyant as it is empty it's about 1.45 positively buoyant and again this is an 8 inch diameter tank and this tank weighs 42 point seven pounds and we jump over here on our high pressure 120 and our high pressure 120 negatively buoyant full 8.8 2 pounds once it gets empty we're talking 0.6 positively buoyant and again this is a seven and a half inch diameter tank and this tank weighs thirty nine point two pounds what we want to make sure you understand when you start using these larger tanks in comparison to a standard 80 cubic foot tank that the mass majority of folks dive with is that these tanks are going to put you at and very easily over your no decompression limit and I'm going to use sixty feet as an example so on air a sixty foot dive no decompression limit depending on the table you use in the computer is approximately 57 minutes now if you're diving on an 80 the average is probably 40 45 minutes on that 80 cubic foot tank depends on the person of course but we're just going to say that's an average now you jump up to this 120 this is 40% more air 133 you're talking 60% more air so if you take those numbers and that standard 40 and then you bump it up just by 40% you're now over your decompression limit using air so if you're going to be using these tanks folks make sure your nitrox certified okay nitrox 32 at 60 feet is if I'm not mistaken I believe it's 90 minutes and nitrox 36 is a hundred and fifteen so that gives you plenty of room on your note decompression limit to use these larger tanks and to make your dives benefit from being down there so if we think about forty percent longer dive and you're doing a 45-minute dive now you're doing you know an hour and ten minutes or so with your dives if you make two dives that's like getting a free dive so make sure that when you start taking these things into consideration and you start using these tanks don't put yourself in a difficult situation by not paying attention to your no decompression limit I will say this larger tanks are a great value just like in the other video where we showed you the compact 80 and its benefits and that high-pressure 100 and its benefits and if you haven't watched that jump over and watch it you're gonna get a lot of benefit from from from seeing that video and of course these tanks like I said are a great value especially if you're in those particular realms of diving like artifact or spearfishing you're going to get a huge benefit out of going with these steel tanks not only from the buoyancy but the time you're able to spend down there so again I'm Bob Collins for diver supply thanks for watching our video on larger tanks we'll see you again soon dive safe [Music]

Channel: DiversSupply

Views: 6,978

Rating: 4.7913041 out of 5

Keywords: steel scuba tanks, large scuba tanks, why buy a large scuba tank, nitrox certification, scuba gear, Why nitrox certification

Id: xezTMC7-PqM

Length: 8min 22sec (502 seconds)

Published: Tue Jan 30 2018