Buy Scuba Tank
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How was the tank stored Was it pressurized Storing a scuba tank with pressurized air may be the difference between a quality tank or a hunk of junk. Scuba tanks stored in moist places with no air inside can be corroded inside and the entire tank will be condemned upon inside inspection.
Think about it: a used aluminum 80CF scuba tank for $80 that needs a replacement valve, a hydro-test, and a visual inspection could cost you up to $160. Conversely, a brand new aluminum 80CF tank on Leisure Pro is around $180. Which one would you rather have
Two online scuba shops do great work when buying scuba tanks: House of Scuba and Leisure Pro. Sift through their selection. They have it all and provide excellent customer service if you have any questions.
Using the correct scuba diving cylinder is just as important to a diver's success and safety as how they configure their gear. A diver may go to an enormous effort to insure every hose, reel and accessory is exactly right only to 'drop the ball' by making the wrong cylinder choice.
In Australia, scuba Tanks must be tested every year (12 months). We always ship cylinders with a current hydro test date. Due to manufacturing and import cycles, the popular sizes of cylinders typically have a factory hydro date less than 12 months old. However less popular sizes of cylinders may have a factory hydro date up to 24 months old as these are manufactured and imported less frequently.
Scuba diving cylinders (USA: tanks, UK: bottles) are awkward and heavy, and if you fall down with one on you'll be lying on your back flailing your arms and legs in the air like a turtle flipped on it's shell.
Steel scuba cylinders have been around since the start of scuba diving, while aluminium diving cylinders came into use in the 1970s. Steel scuba cylinders are typically more expensive than the same capacity aluminium cylinders.
Most technical divers use steel scuba cylinders, but they can be a good cylinder for regular recreational scuba diving too. The most common size is a 232 bar, standard 12.2 litre steel cylinder, but many women and those who use less air often prefer a lighter and smaller 10.5 litre cylinder.
Aluminium scuba cylinders came into use in the 1970s and are the most common scuba cylinders you'll find in tropical waters for recreational diving. Many dive shop, boat and resort operations use them worldwide.
Aluminium cylinders being made of a softer, lighter material have thicker walls, making them larger and heavier than steel cylinders of the same capacity. Aluminium cylinders are relatively inexpensive and thus a good choice for most recreational scuba divers.
One downside of the aluminium scuba diving cylinders is that most go from being negatively buoyant to positively buoyant as they empty during the dive, so most divers wear a few extra kilograms (or pounds) of weight to compensate for this. There are a few models of aluminium cylinders that are built specifically to eliminate this problem, but like everything else, the more features it has, the more expensive it is.
When purchasing scuba cylinders, the long-term advantages of steel's excellent buoyancy characteristics and long life make it the best choice for most divers, but especially those in cold and temperate waters. Choose a 232 bar steel tank size that meets your needs when it is under filled, putting an end to short fill concerns. For most divers this will be a 12.2 litre (100 cubic foot) cylinder, but some may prefer the smaller 10.5 litre (85 cubic foot) cylinder.
Remember, the standard 207 bar aluminium 11.1 litre (80 cubic foot) capacity cylinder with a K valve is not a \"one-size-fits-all\" tank. Making the right cylinder choice can significantly improve your diving enjoyment. Please use this list as a guide when reviewing scuba diving cylinders and you should be able to find the right cylinder/tank to last you for years of diving.
But, before you go ahead and buy a dive tank, there are some questions you'll want to answer to make sure you are spending your hard-earned money as wisely as possible. The answers to these questions will vary depending on who you are, where you live and dive, and on the type of diving you anticipate doing.
For most divers, a typical day of local diving involves at least two dives. For example, a common type of boat dive is a two-tank boat dive. Often you might travel to a remote site and it's not convenient to get to a dive shop for air fills in between dives.
Steel scuba cylinders are negatively buoyant (more so when the cylinder is full) and are the typical dive cylinder to be found in southern Australia. Steel cylinders are available in a range of sizes including: 3, 5, 7, 9, 10.5, 12.2, 15 and 18 litres with a maximum operating pressure of 232 bar (sometimes referred to as low pressure). Steel or 300 bar (high pressure) cylinder are also available in 12, 7, 5 and 3 litre sizes.
232 bar or 300 bar More is better, right Sounds like a no-brainer, but there are some drawbacks. Higher pressure requires more metal to contain it, so the higher pressure 300 bar tank is usually as big as the lower pressure 232 bar one, but much heavier (16.7 kg vs 12.9 kg) as the walls have to be thicker to contain the extra pressure.
!!! IMPORTANT !!! Cylinders and valve threads come in a variety of sizes and great care must be taken to ensure when fitting a valve to a cylinder that matching threads are used. The valve thread specification must exactly match the neck thread specification of the cylinder. Improperly matched neck threads can fail under pressure and can have fatal consequences if someone is hit by the flying valve or cylinder. Only qualified scuba servicing professionals should be installing this equipment. Please ensure you have the training and experience required before purchasing this item if you intend to fit it yourself. If you are unsure, please call your local scuba technician to provide appropriate information for your system.
Please Note: The M25X2 metric thread valves are only for use with metric M25X2 threaded cylinders. While they can be wound into a cylinder/tank with a 3/4 inch NPSM threaded neck, they will not seal properly and the combination can be very extremely dangerous. Do not try and use these M25X2 valves on typical Faber, Catalina, Luxfer etc. cylinders purchased in Australia.
In the real world yes, you need a cylinder boot on a steel scuba cylinder. Most steel cylinders have a rounded bottom. Thus a cylinder boot gives your otherwise wobbly steel cylinder something to stand in to keep it upright. It also gives it a layer of protection against bumps and bangs. A worthwhile investment. Most of the steel cylinders we sell come with a boot.
Most aluminium scuba tanks have a flat bottom and thus can stand upright without a cylinder boot. Some people put cylinder boots shaped for aluminium tanks on them for added protection of the cylinder base.
Remember, the standard 207 bar aluminium 11.1 litre (80 cubic foot) capacity cylinder with a K valve is not a 'one-size-fits-all' tank. Making the right cylinder choice can significantly improve your diving enjoyment. Please use this guide when reviewing scuba diving cylinders and you should be able to find the right cylinder/tank to last you for years of diving.
Check both the listed weight of a scuba tank and its positive buoyancy rating. One tank may be heavier than another but still be more buoyant. An aluminum 80 swings between about 1 pound negative when filled to 1 pound positive when empty. A steel high-pressure 149 swings from about negative 9.5 pounds when full to positive 2.4 pounds when empty.
The actual proper name for the big heavy thing we use to go diving is a cylindrical pressure vessel. A tank is the proper term for an unpressurized container like a fuel tank. The people who make pressure vessels for diving, call them high pressure compressed gas SCUBA cylinders. When the cylinder and valve are discussed as a single unit, SCUBA tank or dive tank is the term used by nearly all divers. For the purposes of this article, we'll adopt the term \"tank\", but you may find elsewhere on our site that we refer to them as cylinders. All SCUBA tanks would technically be considered \"high pressure\" vessels, but within the recreational diving community the terms \"low\", \"standard\", and \"high\" are often used to describe dive tank service pressures and we will continue to use that convention within this article. Finally, the information in this article is focused on recently manufactured scuba tanks currently sold in the United States.
There are several SCUBA tank manufacturers, and the specifications for their tank pressures, dimensions, and capacities are constantly changing. Divers can choose between SCUBA tanks manufactured from aluminum or steel. Dive tank pressures span a wide range, but the most common pressures are \"low\" (2400 to 2640 psi), \"standard\" (3000 psi), and \"high\" (3300 to 3500 psi). They are available in a huge selection of capacities as the primary dive supply ranging from 50 cubic feet to 150 cubic feet. Tank coatings fall into three general classifications of painted, galvanized, and uncoated. This article will help guide divers in the selection of tanks. However, keep in mind that there is no \"perfect\" tank for all diving conditions and all divers.
It's important to know that service pressure alone does not determine capacity. All tanks have a mathematical relationship between their internal volume, their maximum service pressure and their actual free gas capacity. Volume is defined by the internal dimensions of the tank, and normally measured in cubic inches or liters of water. Free capacity is defined by the amount of breathing gas released at the surface that the scuba tank will hold at its maximum rated service pressure. Determining the actual capacity from the water volume and service pressure is troublesome, because not everybody does their math quite the same way. In fact, several tanks actually hold much LESS air than the size used to describe them. For example, the \"standard\" aluminum 80 (AL80) truly holds only about 77 ft3 of air. Technical divers must keep in mind the free capacity can be 10% to 20% LESS for Trimix than for air. For a very technical explanation, you could read our article titled Calculating SCUBA Cylinder Free Capacities. But for now, just remember that because a tank has a higher maximum service pressure doesn't mean it has \"more air\" and that tank marketing descriptions may overstate their capacity. 59ce067264
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