Howdy all!
During kit setup checks or buddy checks I've come across a few divers who, as well as testing that the LPH assembly will correctly dump air, also test that they can orally inflate with it.
I don't really want to question it because it doesn't cause any issues and takes a few seconds but this seems to me like a lack of understanding about how the LPI 'dump' assembly works. Pressing the deflate button on that assembly basically just creates a hole in the bladder (so air can escape or be pushed in). If you test it dumps, you've tested that air can move through the hole.
Surely if air can pass through a hole it in one direction, it can also pass through it in the other direction?
What value does checking oral inflation add if you know the assembly dumps correctly? Is there a situation that the hole may work in one direction (dumping air from the bladder) but not in the other direction (orally inflating)?
It sounds silly, but it's a genuine question: if there's a good reason for this test I'm totally going to include it in my OW classes. I don't want to add something unnecessary but also I wanted to check I'm not missing something important.
During kit setup checks or buddy checks I've come across a few divers who, as well as testing that the LPH assembly will correctly dump air, also test that they can orally inflate with it.
I don't really want to question it because it doesn't cause any issues and takes a few seconds but this seems to me like a lack of understanding about how the LPI 'dump' assembly works. Pressing the deflate button on that assembly basically just creates a hole in the bladder (so air can escape or be pushed in). If you test it dumps, you've tested that air can move through the hole.
Surely if air can pass through a hole it in one direction, it can also pass through it in the other direction?
What value does checking oral inflation add if you know the assembly dumps correctly? Is there a situation that the hole may work in one direction (dumping air from the bladder) but not in the other direction (orally inflating)?
It sounds silly, but it's a genuine question: if there's a good reason for this test I'm totally going to include it in my OW classes. I don't want to add something unnecessary but also I wanted to check I'm not missing something important.