CC1020
Contributor
I was wondering about the differences, and advantages/disadvantages of High-Pressure and Low-Pressure tanks. Are there specific applications for the two types?
Thanks
Thanks
HP or LP cylinders?
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PerroneFord
Contributor
Choose the one that trims you best and holds the amount of air/gas you want. For me that's LP. For others, that may not be the case.
Good luck.
Good luck.
This was covered in part in a recent thread that might be helpful; http://www.scubaboard.com/showthread.php?t=162005
OP
CC1020
Contributor
Thank you both for your input
CC1020:I was wondering about the differences, and advantages/disadvantages of High-Pressure and Low-Pressure tanks. Are there specific applications for the two types?
Thanks
What Happened to Low-Pressure Cylinders? Many experienced divers have preferred low-pressure cylinders because they are easier on regulators, have no short-fill concerns, and are more suitable for partial-pressure blending. More recently, the low-pressure 3AA cylinders (2640 psi, i.e., 2400 with a +) are being replaced by the new DOT exemption cylinders (3442 psi, no plus needed). That's because you can use the high-pressure 3442 psi cylinders as low-pressure 2650 psi cylinders if you prefer, simply by under filling. The 3442 psi DOT Exemption cylinders have the same length, diameter, and capacity at lower 2640 psi pressure as the 3AA cylinders. Even better, the empty weight of the new cylinder design has been reduced slightly, yet the buoyancy remains slightly negative when empty.
From: http://www.diveriteexpress.com/gas/steel.shtml (scroll down the page)
PerroneFord
Contributor
Despite the fact you can use the HP cylinders with less pressure in them, they do trim differently than the LP cylinders due to difference in construction methods.
Both need to be taken into account.
Both need to be taken into account.
OP
CC1020
Contributor
PerroneFord, when you say that they trim differently, how do you mean?
PerroneFord
Contributor
Some tanks float valve down, some float bottom down... Some change over the course of the dive based on how much air is in the tanks. Like an AL80.
OP
CC1020
Contributor
Ok, thank you very much
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