twin 12 300

speedygonediving · Apr 25, 2004

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hi all at yd
does any one use twin 12 300 bar if so what do you think of them do you find that they are too heavy or about the same as 232 bar twins
look forward to any replys
thanks speedy

Digger · Apr 25, 2004

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They will be significantly heavier. Personally, if I used 300bar 12s I'd be overweight with no weight on me at all, and once all the other bits I need for a dive go on, then I'd sink like a rock.

To be honest, if you really need 300bar 12s, you might be better off with twin 15s wouldn't you?

And if you're going to be diving twin 12s, you probably want to be on nitrox, which is a real pain to blend to 300bar, and if you're oging deeper and get into trimix I don't know of anyone who uses 300bar tanks for it.

I think Wacker's got a set of 300 12s, you could ask him. He'll probably be along in a minute anyway.

Hope this helps.

Digs.

Guest · Apr 25, 2004

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I had a set and got rid of them quite soon. Far too heavy to cart around and in the water and unless you are planning to do some serious diving are unneeded anyway. 232 bar 12's have done for anything up to 60m + for me without coming close to getting empty.
By the way, I am no lightweight for carrying them around, while I am not fat I am over 6 feet and fairly heavy rather than a 5ft flyweight

Wacker · Apr 25, 2004

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And as if by macic the shop keeper appeard !
Dig is right they are very heavy .
They would also be no good for rib diving, to dangerouse to try and lift on the boat.
You need to be very negative at the start of the dive, to be able to stay on a stop with empty cylinders at the end. Therefore you need a large amount of bouyancy to float the rig at the surface with full cylinders.
They are very top heavy and flip you on your back if you are not very carfull.
BUT you can do an entire days diving on one fill.
Unless you are built like Geoff Capes they are total over kill!
They weigh about the same as 3x 232 bar cylinders
Hope that helps
P.S. You will need a trolly to move them about safely

WAC

speedygonediving · Apr 26, 2004

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thanks lads
food for thought a friends got some and he loves them had 15 befor they got nicked and prefers the 12s so i just dont know got twin 7s 300 whish are cool for ribs and little dives just want them for more bottom time and fun if you know what i meen so i am in two minds now
cheers
ps if you have any twin 12s for sale lt me know thanks for the help speedy

StuartM · Apr 27, 2004

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I use twin 20's, probably weigh about the same as twin 12/300's but have a lot more advantages.

They are very close to neutral in the water, I can get away with just a 45lb wing with two stages with them. With 12/300's that isn't going to happen, they are very negative.

They are 232bar. Mixing nitrox at 300bar is a pain and trimix is even worse. Even doing an air fill isn't easy, there are loads of shops advertising 300bar fills but in reality you only get about 260-270 after cooling. Without doing any maths I'd say they were a bit more efficient in gas use too, i.e. you can fill from a lower pressure helium bottle. For example to do 18/40 in a pair of twin 15's would need about 140-150bar in the helium bottle to start with, for twin 12/300's you'd be looking more at 170-180'ish to start.

Forget boat diving with either set, you'll never get up a ladder. The walk up the hill in Dorothea is just about doable if you had to (usually drive). Nor will anyone thankyou on a RIB if they have to pull them in! I imagine 15's aren't much more than 232/12's.

speedygonediving · Apr 27, 2004

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thanks again lads looks like 232 then

shame they are too heavy but dont want to f**k my back up

Kristen · Apr 27, 2004

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Twin 10 300s are about 2kg heavier than twin 12 232s and, for me, would mean that I could lose 5kg off my weightbelt. The net result for me is therefore 3kg better off with twin 10 300s.

I am still umming and aahing over whether to buy twin 10 300s - so much helpful advice means that there is no clear winner!

MATTBIN · Apr 27, 2004

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I looked at 300 7's or 232 10's. Which is similar to 300 10's against 232 12's. I chose the 232''s (10) as I wasnt happy I could easily get a 300 fill (especially Nitrox) and the gas advantage disappeared if I didnt get a proper fill. The negativity of the 300's did mean I could lose weight of the belt but I think it was outweighed by the lack of more gas.
Just my opinion, for what its worth.

Matt

speedygonediving · Apr 27, 2004

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i asked about 10 300 at my local dive shop (scuba and outdoor cannock scuba) and he said that 10 300 dont exist dont know why

but never mind let me know what you think
speedy

Digger · Apr 27, 2004

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They do exist, and you can buy them. Tell them to stop trying to sell you what they can get, and tell you the truth. Faber website makes it quite clear they're available, and I can think of at least 5 or 6 suppliers who can get them for you, or probably have them in stock.

I don't see how this is working mind, you start off by asking about 300 12s, then say 232s are the answer, then ask in your LDS about 300 10s? You really don't know what you want do you! Don't worry, I had the same thought when I started buying tanks, got a set of 300 7s, then moved onto the 232 12s, and I'm about to get a second set, probably 232 7s for pootling about.

The weight off the belt with 300s is a bit of a false economy. The steel isn't an efficient way of carrying the weight, especially on land vs in the water, possibly better to get bigger 232 tanks and put the weight on as lead. You'll need less weight out of the water overall. That said, I like having my set all on my back, but I can get that now with a V or P weight.

Sandman · Apr 27, 2004

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232bar 12's are the way to go and funnily enough I'm selling mine in the near future to make way for the inverted 3's. Faber cylinders bought new last year, MDE manifold and rubber tactile knobs. Currently inverted on an Enjay Marine valve guard.

Any interested parties get in touch.

Cheers

Simon

twin 12 300

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