Why 300 BAR / 4350 PSI Steel Tanks aren't so popular....? should be a winner - no ?

[yaronad]

I have a 12l 300 bar cylinder. It is not very nice to dive, I end up feeling more head heavy than usual and so fear floaty feet. The extra weight and so less lead seems good in theory but doesn't seem to pan out in reality. One day when very bored I will weigh it and a normal 232 bar 12 in the pool.

There are people in our club using twin 300 bar 10s. They need no lead in the sea and are always concerned about wing capacity! Others have claimed that twin 7l 300s are the perfect setup for shallow diving.

Much in diving is great in theory and rubbish in practice....

Ken

Thx! M8
this is the kind of answer...I was hoping to get. the practical one....

I don't know about others that read this...
but I'm convinced completely.
12L short / 232 bar....this is going to be my steel tank setup for the near future....
or at least until my breathing rate...will decrease dramatically .....
right now I breath 20L per min [emoji15]
my team divers / buddys are at 10L!
on shellow water.
knocking my head how to get there

Again thx all for the educational answers[emoji41][emoji106]





Sent from my SM-N9005 using Tapatalk

 

[lucca brassi]

For diving tank is important buoyancy difference between full tank and empty tank around neutral.

HP have that characteristic very negative in both modes. http://www.cisatlantic.com/graphics/ScubaTankBuoyancy.pdf

http://henrik.synth.no/scuba/tanks....&salt=true&alu=false&valve=true&doubles=false

D7/300bar -6,4kg empty / -11,5kg full

D12/232bar -1,4kg empty/ -8,3kg full

You need more non compressible lift (mean dry suit )

Still rare diving centres fill tanks to 300 bar . Some uses these tanks for rebreathers due their pressure and small size.

They need no lead in the sea and are always concerned about wing capacity!

for safety is better to have weights + lighter tank .. it is hard to drop scuba tank ;-))

 

[yaronad]

For diving tank is important buoyancy difference between full tank and empty tank around neutral.

HP have that characteristic very negative in both modes. http://www.cisatlantic.com/graphics/ScubaTankBuoyancy.pdf

Scuba tank size and buoyancy calculator

D7/300bar -6,4kg empty / -11,5kg full

D12/232bar -1,4kg empty/ -8,3kg full

You need more non compressible lift (mean dry suit )

Still rare diving centres fill tanks to 300 bar . Some uses these tanks for rebreathers due their pressure and small size.



for safety is better to have weights + lighter tank .. it is hard to drop scuba tank ;-))

OK - make sense


Again thx all for the educational answers

 

[ajduplessis]

Getting 300 bar fills is a problem nearly everywhere. The 12l shorts (bombs) in 300 bar format will make you top heavy and is very uncomfortable (at least for me). The 12l longs will make nice doubles and they side mount great. 232 bar is plenty.

PS: the other issue with 300bar valves are the threads, you have to add insert when filling; few operators have 300 connectors.