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#299
Diving LP steel for the first time and have a question.
JeffNColdWater - 3/15/2017 5:12 PM
Category: Equipment
Replies: 6

I’m due for the first dive of the new year this weekend and my shop didn’t have the HP Steel 100s I usually dive with so I’ve got LP Steel 108s.

First question, I usually dive to about 900 PSI before ascending. Since I’m starting out at 2400 PSI should I adjust that number? It seems to me that it should use the same 900 PSI, but since I’m new to the tanks, I just want to confirm so I don’t leave too much air in the tank or even worse, risk not having enough for a safe ascent.

Second, these are much larger and seem heavier to me, should I be adjusting weighting?

And yes, I did ask the shop these questions and they did give me an answer, but I figured the collective knowledge of the Internet might give me a clearer answer. And to be honest, I’ve gotten bad or at the least, incomplete answers from pros in the past.

Thanks All
-J
#12421
LatitudeAdjustment - 14 days 2 hours ago.
" It seems to me that it should use the same 900 PSI, but since I’m new to the tanks, I just want to confirm so I don’t leave too much air in the tank or even worse, risk not having enough for a safe ascent. "

From what depth?
#299
Subscribed
JeffNColdWater - 14 days 2 hours ago.
Good point. Never completely sure where the boat will go. It depends on conditions, but it will be between 40 and 80 feet. My usual depth off this boat is around 60.
#1380
ELLOCODIABLO - 14 days ago.
900 psi in a hp100 (3500)would be 26 cf of air. 900 psi in lp108 would be 40cf of air. I run my lp125 twins to 3600 so i end up close to 380cf
#1380
ELLOCODIABLO - 14 days ago.
To adjust for weighting you can look up scuba tank boyancy chart on goog and follow the link to Huron scuba. It has the diff in raw weights. You can compare the tanks and adjust accordingly
#476
#5520
Eric_R - 13 days 7 hours ago.
Some times the tank differences work in your favor. When I went out east last summer I rented a high pressure steel 80 and it was perfect for me in salt water. I didn’t have to add any weight to my normal aluminum 80 use setup for fresh water.