I was watching a new episode of Dive Talk on YT last night (wonderful channel, highly recommend), and they were reacting to an instance where a DM had what appeared to be an O-ring burst at depth. The entire incident was handled very well.
They then went into a discussion of hose failures. The first question to come up was which failure will drain a tank faster, a HP or LP hose. Opposite to what common sense says, the LP hose will actually drain a tank faster due to it's wider diameter (which makes sense as it is supplying the diver's breathing gas as opposed to a HP hose that is just supplying the SPG). The image that was shown appeared to be the endcap of the HP hose, which did have just a pinhole sized opening. My first question is if the entire hose has this diameter opening?
The next topic they were discussing is if the cylinder would empty faster at depth. From my understanding, the ambient pressure at depth would not have an impact on gas coming a failure at the LP or HP hose, as the system is closed until the gas reaches the second stage. They were considering an experiment at 100' of cutting both a HP and LP hose to test how much time it would take to empty a cylinder. Interesting food for thought, and I was hoping to find some more amplifying info here. Thanks!
They then went into a discussion of hose failures. The first question to come up was which failure will drain a tank faster, a HP or LP hose. Opposite to what common sense says, the LP hose will actually drain a tank faster due to it's wider diameter (which makes sense as it is supplying the diver's breathing gas as opposed to a HP hose that is just supplying the SPG). The image that was shown appeared to be the endcap of the HP hose, which did have just a pinhole sized opening. My first question is if the entire hose has this diameter opening?
The next topic they were discussing is if the cylinder would empty faster at depth. From my understanding, the ambient pressure at depth would not have an impact on gas coming a failure at the LP or HP hose, as the system is closed until the gas reaches the second stage. They were considering an experiment at 100' of cutting both a HP and LP hose to test how much time it would take to empty a cylinder. Interesting food for thought, and I was hoping to find some more amplifying info here. Thanks!