Are HP tanks what I need?

[uncfnp]

If you want a short tank, the HP80 is for you. It has a nickname "bowling ball with valve" because it's so short. This is the opposite of the LP85 which is tall and skinny. Very different trim properties for those two tanks.

You might also look at a LP80, which I've rarely seen but I have seen at least one. It's about the size of an AL63. No problem getting good fills, which sometimes does happen with the HP tanks.

Maybe I'm just asking for trim problems with the HP tank but its only 2 inches shorter than the AL63 which I loved. I know the weight is different but would the trim feel that much different? I am 5'4." Using an AL80, the tank band is right where the tank starts to taper toward the valve and my head will hit the first stage if i look up. The other end is just below mid thigh. I have had the tank slip loose a few times even wetting the band first.

i can try it on first at the LDS but diving with it is not an option locally.

Bottonline, I know nothing about tanks but I'm short and like the shorter tanks but is using a HP 80 as single tank, back mount unrealistic. Thanks for all the great info so far.

BTW, looking for LP80 options but no luck so far...

Lisa

---------- Post added April 6th, 2013 at 07:42 PM ----------

I love my HP 80s and 100s. The 80 is a very efficient package for the size and total weight involved. I break it all down here.

Pete

Pete,

Do you dive the HP80's back mount and if so any issues?

 

[redacted]

Tank specifications: Scuba Cylinder Specification Chart from Huron Scuba, Ann Arbor Michigan

If you atre short, an HP 80 should be perfect if you can get good fills.

 

[uncfnp]

Tank specifications: Scuba Cylinder Specification Chart from Huron Scuba, Ann Arbor Michigan

If you atre short, an HP 80 should be perfect if you can get good fills.

Thanks awap. I checked with the LDS here and with Force-e in WPB, the 2 shops where most of my fills will be done, and they both assured me no issues but I've noticed problem fills is a recurring theme. Should I be more concerned about this and is there anything I can do to ensure good fills?

 

[spectrum]

If you want a short tank, the HP80 is for you. It has a nickname "bowling ball with valve" because it's so short.

That's the HP 65, now that's weird little item.

 

[eelnoraa]

I have 2 PST LP80. It is actually exactly the same size as Worthington LP85. So it is 1 inch or so taller than a HP100. I think I even have a picture in here showing LP80 next to HP100.

As for trim related issue, I kind of think for single tank, it can be easily adjusted by the posture in water. But it will depend on your other equipment too.

 

[redacted]

Thanks awap. I checked with the LDS here and with Force-e in WPB, the 2 shops where most of my fills will be done, and they both assured me no issues but I've noticed problem fills is a recurring theme. Should I be more concerned about this and is there anything I can do to ensure good fills?

Some operations seem to be set up for 3000 psi fills and are either unable or unwilling to adjust. Occasionally you find an op that just seems to like to provide short fills but healthy competition will usually take care of that. I even ran into a live-a-board that said they welcomed your private tanks but were unwilling/unable to provide more than about 3100 in my HP100.

 

[spectrum]

I think I've created some confusion. I don't really need more air. I rarely use all I can from an AL80. But I want shorter tanks. I like the length on the 60's (but thats not quite enough air) I used in Bonaire so that got me thinking about HP 80's. Awap's post got me to looking at the LP85's too.

As much as $200 is not cheap it really is a good price for those, especially if they are creampuffs. Unless you find someone that is cluless you won't do better.

I think you are on the right track and you know why. 80 CF is more than adequate and you enjoyed the AL63. FWIW I'm 5-10 and I have no issues trimming out wet or dry, salt or fresh.Based on your profile cylinders that lets you be a little lighter on your feet will be a nice enhancement.

Some divers are obsessed with maximum air for want or need. You have a clear picture of your usage so that's that. Beyond today you are not married to these cyclinders. You can always add to the collection or flip them for others. There's also the chance you will extend your range and want more gas especially as a shore diver. We have been known to surpass 2 hours. Meanwhile don't lug big cylinders around because you may have a need someday.

Pete

 

[Colliam7]

I checked with the LDS here and with Force-e in WPB, the 2 shops where most of my fills will be done, and they both assured me no issues but I've noticed problem fills is a recurring theme. Should I be more concerned about this and is there anything I can do to ensure good fills?

No, you should not. Any competent dive shop will be able to fill HP cylinders. I see this issue raised from time to time, and simply don't understand it. In NC, whether you are in the coastal area or the Piedmont, you can get full HP fills. I have never had a problem - in VA, NC, SC, or FL. Maybe, I just haven't gone to enough shops in remote locations.

Maybe I'm just asking for trim problems with the HP tank but its only 2 inches shorter than the AL63 which I loved. I know the weight is different but would the trim feel that much different? I am 5'4." Using an AL80, the tank band is right where the tank starts to taper toward the valve and my head will hit the first stage if i look up. The other end is just below mid thigh. I have had the tank slip loose a few times even wetting the band first.

The issue you need to consider really is trim. Virtually any steel cylinder - HP or LP - is going to be heavier than an AL cylinder, and that mass will be positioned above you (when in a horizontal position). For some people - not all, but some - that will create a tendancy to roll / go inverted - the heavier cylinder seeks the low position - particularly IF you are diving a wetsuit and a jacket BCD. If you can try the cylinder in a pool first, I would recommend it. In my case I find LP cylinders to be more challenging than HP cylinders, so I don't recommend LP. But, your experience may differ.

 

[uncfnp]

Thanks guys. I am sold on the HP 80's and plan to take a look at the pair at my LDS next week. As spectrum said, I can always upgrade later. Thanks to all for helping me make an informed decision.

 

[Peter_C]

My partner has four HP80 PST tanks. Got them for $100 each, but out of hydro. Since she is a whopping 98lbs and stands 5'2" they are the perfect tank for her. An HP100 which we have two of, would be too long for her stature, as she doesn't like the AL80's length, but the AL80's are usable.