exploding cylinders

[scubacoach]

Earlier in this thread a dsmb is mentioned, however the din insert or valve on the cylinder which can also have salt water around can be blown into the cylinder from a compressor. Then corrosion which can be upto 1000 times faster than in air can occur leading to a hole in the cylinder wall at best or dead gas monkey at worst.

[Nick_lincoln]

Originally Posted by Aquatic Adventures

A pony should be ON, its a cylinder there for emergency use and in an emergency you want to breathe not p**s around trying to turn it on. A stage should be pressurised and off. This is to keep water out of the 1st stage of the reg not the cylinder.
The way water gets into a cylinder is if it gets emptied by any means while still submerged. If this happens then you should always get the cylinder checked at a testing station.

Wasn't talking about a pony, was talking about a side slung cylinder for deco. Yes I agree a pony should be turned on as it will be a right ballache to try to turn it on when its strapped to your main cylinder.

I think the best bet for deco cylinders to protect the diver in case of breathing off a mix with > 21% O2 below its MOD and the cylinder from water ingress is to pressurise the 1st stage, 2nd stage and hoses then turn the cylinder off until you need it.

[stevechesh]

Originally Posted by Nick_lincoln

........

I think the best bet for deco cylinders to protect the diver in case of breathing off a mix with > 21% O2 below its MOD and the cylinder from water ingress is to pressurise the 1st stage, 2nd stage and hoses then turn the cylinder off until you need it.

Thats what most people do anyway. . . . .

[Regthing]

Yep. A few of you have it right. Any cylinder sucked dry will let water in full stop. Get it checked before you get it filled.

There also seems to be a practice with ponies that people will suck them dry in a training situation to see how long they will last them. This is fine but don't actually suck it dry. Make sure you leave 10-20 bar to keep the water out. Fair enough if the shit has hit the fan and you're actually using it to save yourself, take every last breath if it gets you to the surface, but get it checked ASAP.

It should also be noted that a cylinder shouldn't be stored empty for any length of time either as this will allow moisture in the air outside the clyinder to get inside.

[A. Berk]

Originally Posted by Regthing

Yep. A few of you have it right. Any cylinder sucked dry will let water in full stop. Get it checked before you get it filled.

There also seems to be a practice with ponies that people will suck them dry in a training situation to see how long they will last them. This is fine but don't actually suck it dry. Make sure you leave 10-20 bar to keep the water out. Fair enough if the shit has hit the fan and you're actually using it to save yourself, take every last breath if it gets you to the surface, but get it checked ASAP.

How do you suck a cylinder 'dry' when regulators require 10-12 bar to function? Remember we take off this residual pressure when calculating 'endurance'.

Berko