Steel hp 120 tanks

[kwinter]

HIGH PRESSURE Steel tanks - rated for 3500 psi fills. Aldora's tanks are HP Steel tanks, which, because of their higher fill pressure, are more compact than the low pressure (really, mid pressure) steel tanks that are only rated for 3000 psi. The LP Steel tanks are both longer and a bit fatter than the HP Steel tanks, while the HP Steel tanks will be a bit heavier as a result of thicker cylinder walls.

I'm sure there are tanks that I know nothing about, but some of what you said just doesn't match my experience. True HP tanks are rated for 3500 psi and are almost always 7.25 inch diameter and 7/8 neck with 300 bar DIN valves required. These are primarily the old PST tanks. They were brought back into production for XS Scuba ( I believe) and had 3/4 necks but still 3500 for a short run. Then they were changed again. Most modern HP tanks have pressure of 3442 psi or 232 bar, so they can use convertible valves.

LP tanks are almost exclusively 2400 psi, giving them a pressure of 2640 with 10% overfill for plus rating. The large LP tanks are usually 8" diameter. I really can't picture someone 5'3" tall using a LP120. The things are huge and heavy. LP95s would be much easier to handle. And many places will give a cave fill of 3000 or more for a LP tank while HP tanks are not overfilled.

I am not familiar with any LP steel tank rated for 3000 psi. That doesn't mean they don't exist. Just that I haven't seen any.


iPhone. iTypo. iApologize.

 

[MMM]

LP tanks are almost exclusively 2400 psi, giving them a pressure of 2640 with 10% overfill for plus rating. The large LP tanks are usually 8" diameter. I really can't picture someone 5'3" tall using a LP120. The things are huge and heavy. LP95s would be much easier to handle. And many places will give a cave fill of 3000 or more for a LP tank while HP tanks are not overfilled.iPhone. iTypo. iApologize.

Yep, that's my experience. I don't use the 120s but rather the 95s. I'm 5'3".

 

[D2H2]

Dear Rick220,

Bluntly I find it near impossible to believe your statement. Perhaps you were confused who you were diving with (some have low pressure Steel 120s) and some have HP 120s like us but get them filled by the main supplier on this island. For such a thing to have happened on an Aldora boat, with our DMs is virtually no chance that could happen without me being informed. I had reported to me of an instance of short fills at 3200 and 3300 PSI and that was completely unacceptable to me-- I just spent $200,000 to make sure things like that don't happen.

However if you can tell me what day you dove in September I can review all dives and discuss this with the dive guides. We do keep a thorough record of dive sites, depths and duration of all dives…and any problems like short fills.

Looking forward to your response.

Dave Dillehay

I find it hard to believe as well. Been diving with Aldora for the last 4 days and not a tank below 3300 PSI. In 11 years of diving with Aldora I never recall a tank below 3100. That includes dives well before Aldora began filling their own tanks.

 

[scubafanatic]

LU offers 120 steel tanks but they are LP, not HP.

Those LP 120 steels are just too bulky/cumbersome for all but the largest of divers, although I do appreciate LU's effort to supply large capacity tanks. The HP 120 steels are more manageable.

 

[djanni]

Truly, our compressor shop goal is 3442 when cold. In practice we fill the tanks up to full hot and then once cool we top them off. Now on occasion there may be a slightly leaky valve that may reduce the pressure, but that usually puts them way down. Or sometimes (actually frequently) each divers SPG reads different than actuality. I expect all tanks on our boats to be above 3400 PSI and a rare reading of 3300 does not drive me crazy, but I don't like it. But are we perfect, I doubt it but never will we accept fills as described b the OP.

Dave Dillehay

I'm happy to say that my wife and I have 63 dives (on 100’s) with you starting August thru today. All the fills, nitrox or air have been within your range.

 

[Dave Dillehay]

For the record, several days ago, I PMd rick220 but received no response. The motivation behind his post remains unknown. My best guess, presuming honesty, is that he may have been diving with another operation and just did no know who that was or what a HP 120 is.

Dave Dillehay

Aldora Divers

 

[Sideways]

We dive with Liquid Blue Divers. Like Judy mentioned, they are an absolutely top notch dive op. I dive HP Steel 120's NITROX with them and have not had a short fill. Kami and Steve are simply incredible. Whoever mentioned the height issue with the 120's, I'd disagree with regards to myself. I'm 5'6" and have no probs. Plus I'm a Photog so I'm very active (swimming) and don't feel any impedance at all with them.

 

[ethington]

Looking at this thread and I have a noob question. We will be diving with Aldora next month. We will have gear with us that belongs to the diving club we trained with, including regulators. Will we be able to use our own yoke-style regulators on the HP Steel 120s that Aldora uses?

 

[mikeycanuk]

Yes. Aldora's website makes mention of the Din conversion but that is no longer the case.

 

[Dirty-Dog]

Looking at this thread and I have a noob question. We will be diving with Aldora next month. We will have gear with us that belongs to the diving club we trained with, including regulators. Will we be able to use our own yoke-style regulators on the HP Steel 120s that Aldora uses?

Aldora can accommodate both DIN and yoke regulators.
When you check in, they collect your gear, and they'll note what sort of regulators you're using and provide tanks to match.