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Old 06-27-2019, 08:33 AM   #16
Diver278
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Re: Weight for salt water locations

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Originally Posted by SEATUX View Post
You really want to split hairs?
Go here:
https://en.wikipedia.org/wiki/List_o...er_by_salinity
Thanks Seatux I wasn’t really trying to split hairs just courious. Great info though. Thanks a lot good reading material.
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Old 06-27-2019, 11:42 AM   #17
PigStikr
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Re: Weight for salt water locations

Actually the weight of your air is going to be the biggest factor. If you leave 500 psi in the tank your tank will gain about 4.5 pounds buoyancy during the dive. A steel 80 weighs less than an aluminum 80, is shorter, and is negatively buoyant after the dive. The aluminum 80 weighs more, is longer, and is buoyant after the dive.
Thus you can dive with a lighter tank AND take about 4.5 pounds off your weightbelt if you use steel. Most charters will only provide aluminum and many can't fully fill a steel tank.
The main takeaway though is that the air in your tank is going to be a much bigger factor in your buoyancy than salinity. Also, if you wear a thick wetsuit locally but a thin one on the trip you will have to dive with less weight. Be sure, either way, that you have enough weight to stay down for your safety stop at the end of the dive.
Edit: I am talking about high pressure steel 80 tanks.
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Old 06-27-2019, 05:13 PM   #18
Diver278
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Re: Weight for salt water locations

Yes tank size and type of tank make a difference. I use my 100 steels and I use 4 lbs of weight with a 1.5mm suit. With a 80 aluminum I have to use more weight to get down. Although I’m not sure how much weight I will need this trip sense I lost almost 20 lbs. Guess I’ll find out in three week from now.
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Old 06-27-2019, 05:19 PM   #19
PigStikr
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Re: Weight for salt water locations

Have a great trip! Post some pics for sure!
I had HP 120's but after taking up freediving could get 2 dives per tank, don't know why. So changed to HP 80 steel. If I ever run into a lot of money gonna surf/dive indo in that order, if they let me spearfish (freedive) that is. Never freedive after SCUBA tho, get U bent.
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Old 06-27-2019, 07:22 PM   #20
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Re: Weight for salt water locations

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Have a great trip! Post some pics for sure!.
I second that
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Old 06-27-2019, 10:55 PM   #21
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Re: Weight for salt water locations

Thanks I sure will. And yes I’ll post pics.
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