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View Full Version : Steel HP 100 or 120 - what's the better choice?



Chilkie
01-06-2010, 22:23
Not too long ago I asked in a separate thread why Al100's got no love and I got some great information and guidance which pointed me in the direction of steel.
I have decided to pick up a couple of steel tanks for use when I go on typical two tank boat dives. Due to the 7.25" circumference of the HP100 and 120 tanks I believe that I will be going with one of these as they fit into the slots most dive boats provide.
Is there anything else I should be aware of when deciding between these two sizes? Is one better than another for OW boat diving?
I simply want to have some more gads available when I dive. Thanks for any guidance which you can provide.

Lulubelle
01-06-2010, 22:39
Not too long ago I asked in a separate thread why Al100's got no love and I got some great information and guidance which pointed me in the direction of steel.
I have decided to pick up a couple of steel tanks for use when I go on typical two tank boat dives. Due to the 7.25" circumference of the HP100 and 120 tanks I believe that I will be going with one of these as they fit into the slots most dive boats provide.
Is there anything else I should be aware of when deciding between these two sizes? Is one better than another for OW boat diving?
I simply want to have some more gads available when I dive. Thanks for any guidance which you can provide.

Depends on your SAC rate Chilkie. :smiley2: Might not be a bad idea to do your Nitrox first before you decide and try them via rental/borrowing. You can take my 100s and try them out if you make it down here.

navyhmc
01-07-2010, 01:30
100: $355, 24" tall, 33lbs empty, 40.5lbs full, -10 lbs bouyant full, -2.5 empty.

120: $390, 28" tall, 38lbs empty, 47lbs full, -11lbs bouyant full, -2 empty.

Depending on you build, the 100's may trim out easier-unless you're taller then the 120's will. The pocket book takesthe biggest hit, $35 for 20 extra cu ft. other than that it's personal preference. Do you feel the need for that extra 20 cu ft?

Chilkie
01-07-2010, 07:52
100: $355, 24" tall, 33lbs empty, 40.5lbs full, -10 lbs bouyant full, -2.5 empty.

120: $390, 28" tall, 38lbs empty, 47lbs full, -11lbs bouyant full, -2 empty.

Depending on you build, the 100's may trim out easier-unless you're taller then the 120's will. The pocket book takesthe biggest hit, $35 for 20 extra cu ft. other than that it's personal preference. Do you feel the need for that extra 20 cu ft?


If I ever "make it down there" to dive with Lulubelle then I hear that an air hog like myself :smiley30: will need all the extra gas I can get.

I'd prefer to have the extra gas and not use it than need it and not have it. For $35 (heck..less than that after the ST forum discount) 20% extra air seems like a barganza.
I just want to make sure it'll trim out all right. It seems as though the 120's are pretty similar in height to typical AL80's if I'm not mistaken.

Aside from ST (old faithful) anyone have any good vendors for tanks? I'm probably gonna buy 2 steel and then 2 AL80's as well. It never hurts to comparison shop.

IndyDiver
01-07-2010, 08:26
Besides how much air you want, it depends on how tall you are.

I am 5'11" and I went with 8" dia Faber FX117 tanks because the 7" dia 120 tank was just too long for me. I don't see how a 120 works for anyone under 6'1" or 6'2". The FX117 and the Worthington HP119 are both 25" long and 8" in dia. The 7" dia. 120 is 28" long, so it is 2" longer than an Alum 80, which is 26".

BTW, I am not sure why the FX117 is called a 117. If you do the math on its water volume, it works out to 122 cu. ft. at rated pressure. Similarly, the HP119 works out to 121 cu.ft. at rated pressure when you do the math.

Grin
01-07-2010, 08:39
It depends on the depth and size of you. I dive aorund 70-80 ft for a typical dive and the 120s are great for this. I can do 3 50-60 minute dives with less than 1 hour surface intervals on NITROX and not be pushing the tables much at all. If your diving shallower on NITROX you might consider the 100s. The only reason I can think of for going 100s is either your a small person or your gas supply is absolutlynot a problem due to normal depth being 50 ft or less or if your a small person who just doesn't use much gas at all.
I'm 6 ft and I own 4, 7.25" HP120s. I also own 2 LP85s that are super small compared to the 120s. If the dive shop puts 3300 in my LP 85s they are almost 120s (about 110s actually). In the water I never can tell much of a difference between the two. I say get the 120s if at all possible. I often do two dives to 80 ft for around 30-35 mins each, on one tank. I guess if your on a cattle dive boat, they might require you to come up at 45 mins or something. In that case 100s might be a better option as you'll never need the 120s capacity.

skdvr
01-07-2010, 09:07
I am going to contradict IndyDiver a little because I am 5'11" and have a set of double HP 120's and they fit me perfectly. There is one place that I dive that you have to sit down on the dock to get your fins on because there is nothing around to hold onto, and I can sit down with them and they are the perfect height that I cannot fall backwards and they do not push me forward. When I dive double 100's I have to be carefull when sitting down because if I sit back to quickly I will end up like a turtle on my back. I have dove my 120's as singles too and they fit just fine, BUT I dive with a BP/W which generally holds the tank higher than most traditional BC's. A buddy of mine that is 6' used my 120's as single tanks and the bottom was hitting him in the back of the leg on the dive because the way he had it in his BC...

I personally really like my 120's, all though for singles I really like my 130 also but then you run into the 8" problem...

Phil

Phil

fisheater
01-07-2010, 10:49
I love my 120s. What's not to love about having more gas to breathe?

navyhmc
01-07-2010, 18:21
I'm using 120's as well...I will admit I do have some trim problems, But I do like the tanks.

comet24
01-07-2010, 20:34
Really depends on your needs. Air consumption and whether the weight difference matters to you. Personally I like HP 119's but they are 8" tanks. Bungee cords are your friend on boats with racks designed only for 7.25" tanks.

CompuDude
01-07-2010, 22:33
100: $355, 24" tall, 33lbs empty, 40.5lbs full, -10 lbs bouyant full, -2.5 empty.

120: $390, 28" tall, 38lbs empty, 47lbs full, -11lbs bouyant full, -2 empty.

Depending on you build, the 100's may trim out easier-unless you're taller then the 120's will. The pocket book takesthe biggest hit, $35 for 20 extra cu ft. other than that it's personal preference. Do you feel the need for that extra 20 cu ft?


If I ever "make it down there" to dive with Lulubelle then I hear that an air hog like myself :smiley30: will need all the extra gas I can get.

I'd prefer to have the extra gas and not use it than need it and not have it. For $35 (heck..less than that after the ST forum discount) 20% extra air seems like a barganza.
I just want to make sure it'll trim out all right. It seems as though the 120's are pretty similar in height to typical AL80's if I'm not mistaken.

Aside from ST (old faithful) anyone have any good vendors for tanks? I'm probably gonna buy 2 steel and then 2 AL80's as well. It never hurts to comparison shop.

120's are noticeably taller than any other commonly-used tank. They're really tippy, too (tip over easily due to their skinny profile and tall height).

I don't care for them... I'd rather have an HP119, which is 8" and the same height as an HP100, or an HP130, which is still shorter than the HP120, but since it's 8" its more stable. Oh, and it holds more gas, too. :)

I'd take Comet24's advice, get a bungee, and get the HP130.

Byte Me
01-08-2010, 09:16
I picked up an HP100 this summer and another for Christmas this year when my LDS had a "free fills for life" sale on the tanks. Couldn't pass that up. Their standard is free fills for 2 years.

May want to check your LDS to find out if they offer anything like that. I'd have loved to buy from ST which is where I get everything else but with the free fills getting local was a no brainer.

Haven't doubled them up yet but that may not be too far down the road!

Jack Hammer
01-11-2010, 11:44
I'm 5'10" and a 7.25" 120 trims out poorly on me. I really didn't like it all. I've got steel 100's and they trim out perfectly for me. Sometimes it's better to rent or borrow for a bit before you buy to find what'll work best for you.