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Old 30 June 2013, 17:27   #41
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Originally Posted by willk View Post
Whisper, there will be around 3000psi in that cylinder - be careful!

I'm using SCUBA cylinders to fill my SIB, so feel free to PM me if I can help.
Thanks dude, it was used to fill my air rifle, but sold the rifle and kept the cylinder, it's never been in the sea or even out in the rain.

But do they suffer from condensation on the inside?
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Old 30 June 2013, 17:35   #42
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But do they suffer from condensation on the inside?
If they are filled with less than 100% dry air, absolutely. They need to be inspected/tested according to your regs. 3000psi in a steel container is a bomb. If it pops, your roof is coming off, or your head if it's nearby. Remember that when lorry tyres pop at 100psi, people can be killed. Worth a check.

I use a SCUBA regulator and some Heath Robinson adapters to get down to the 11.5psi my airdeck needs.
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Old 30 June 2013, 17:37   #43
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If they are filled with less than 100% dry air, absolutely. They need to be inspected/tested according to your regs. 3000psi in a steel container is a bomb. If it pops, your roof is coming off, or your head if it's nearby. Remember that when lorry tyres pop at 100psi, people can be killed. Worth a check.

I use a SCUBA regulator and some Heath Robinson adapters to get down to the 11.5psi my airdeck needs.
Ok, I will remove it from under my bed and put it in the garage
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Old 30 June 2013, 17:38   #44
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I use a SCUBA regulator and some Heath Robinson adapters to get down to the 11.5psi my airdeck needs.
Did you use a pressure regulator or governor?
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Old 30 June 2013, 17:43   #45
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Did you use a pressure regulator or governor?
I suddenly see your problem. I use the Low Pressure feed from a SCUBA first stage regulator - they max out at around 13-14 PSI - you need 16? EDIT: This is not correct, those figures are for BAR, so LP or Intermediate pressure is around 150 PSI

The other supply is the High Pressure feed to the pressure gauge, it runs the full 3000psi but at low flow rates. Not sure how you'd tap into the HP feed! You won't have to...
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Old 30 June 2013, 18:03   #46
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Hummmm, the pressure gauge is on the outlet side of the main tap so thats the outlet pressure's sorted although there is no cut off for over pressurisation

I guess I was planning on tapping from the connection at the end of the hose and stepping up to the same size as the connection on the end of the foot pump (the internal diameter of the sib valve inlet on the keel). This is the same size inlet as on the other valves so it could be used in connection with the several emergency repair kits and clamseal.

The floor has the retaining straps for the cylinder to keep it from rolling around the boat.

I don't have to use it, it's just that I already have it and am used to decanting it into a 0.5L cylinder that I had on my rapid 7 air rifle.
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Old 30 June 2013, 20:11   #47
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3L Dive Cylinder in a black case, I will need to sort out a way of connecting it to the valves so it can be used to bring the keel up to its required 16psi pressure and also there is a space on the deck where it straps in

I'm not planning at this stage to connect it via the co2 fittings on the tubes.
Are you planning on getting it filled with CO2 or just pressurized air?

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As an FYI dive cylinders should be serviced every couple of years. They check the inside for corrosion. Due to the massive pressure in them I would recommend it
Here in the USA cylinders have to be hydro'ed every 5 years. Visual inspection is a yearly dive shop thing here to generate revenue. Aluminum cylinder that are never breathed don't really need to be kept spotless, and the aluminum also happens to not corrode very much, which is why they do work well in humid areas.

Aluminum tanks are dangerous and have killed many people with their shrapnel. Steel on the other hand tends to pop and not come apart.

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I suddenly see your problem. I use the Low Pressure feed from a SCUBA first stage regulator - they max out at around 13-14 PSI - you need 16?

The other supply is the High Pressure feed to the pressure gauge, it runs the full 3000psi but at low flow rates. Not sure how you'd tap into the HP feed!
A normally tuned scuba regulator should have, what is known as intermediate pressure, set to around 130-140 pounds per square inch. Yes you could de-tune a reg severely, but all have what is known as IP creep which can vary by 10 psi.

Just watch it as you fill. I always fill my boat at home with my 125 psi compressor unregulated. No biggie, I just use a gauge. Once I have used most of a scuba tank I will often use it for topping up the boat if needed. Otherwise I find my hand pump keeps me from using valuable air that is better used underwater.
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Old 01 July 2013, 05:29   #48
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A normally tuned scuba regulator should have, what is known as intermediate pressure, set to around 130-140 pounds per square inch. Yes you could de-tune a reg severely, but all have what is known as IP creep which can vary by 10 psi.
Ach! BAR! Thanks Peter!

I wrote/thought PSI instead of BAR. PSI was history here by the time I started diving but is still in vogue for RIBs and car tyres (auto tires ). I often accidentally mix them up, luckily not in practice. Intermediate pressure side of the reg is generally set for 8-14 BAR, depending on the manufacturer. Poseidon used to be quite high 13ish, others like the old Apeks quite low. Divers tend to refer to the takeoffs from that side as LP feeds (for drysuits and BCD) as opposed to the HP feeds going to pressure gauges and computer sensors.

My bad. But the upshot is that whisper can easily fill his SIB with a SCUBA reg inflation system. Gonna edit that post in case someone goes pop!
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Old 01 July 2013, 06:42   #49
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I've just read in this document that the keel pressure is 16 psi +- 10% so I reckon that's 14.4psi to 17.6psi and the electric pumps go up to 14.5psi so is this problem solved???

http://zodiacmilpro.com/wp-content/u...or-Z802292.pdf

If I don't carry the air tank I could carry this holdall in its place that could also contain the battery box and other equipment.

At the risk of looking like Martini II Although I can't find a picture of it in use at the moment

ATV / QUAD SOFTBAG GEPÄCKTASCHE KOFFER TOPCASE QUADKOFFER STAUBOX BOX TRIKE NEU | eBay
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Old 01 July 2013, 11:58   #50
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Copy cat!

Those ATV bags work quite well, I looked for one that had just the right dimensions so fits nicely across the transom.

Couple of downsides though:
The top swings up for access from behind the quad bike, wrong way for us.

Gets in the way a bit when you tilt the engine up

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