home made dsv

Classic Kiss canister tube isn't PVC? it seems to be dived a bit deeply enough to use helium without smoke inside but may be it's another kind of a PVC...


David

...Take PVC to start with. ... try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in.

Seakrakken is unfortunately too accurate for sports RBs as they stand just now, but Firemandiver in Post 3 is right.

Take PVC to start with. Put it into a chamber with a window in it. Blow down, bring it back to surface. Watch it smoke on the way back up, especially with helium: literally the gases that come off it often look like smoke (I must post some pics!). Now try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in. Nothing to worry about right now, but it will not help you attain much in the way of old age. Now take valves that stick, handles fall off, hoses fall off, WOB is through the roof, mushroom valves that stick, or get trapped in the mushroom's spider, mushrooms that soften in water or oil then fold up, etc.

Learn from the experience Paul Raymakers is kindly reporting free of charge on this forum: he has more resources than most home builders, designed his rEvo, improved it, thought he got it "right", then went and tested it. Look at how many mods he is doing from the test results just to get to the "minimum" safety level of EN14143. Until you test it scientifically, thoroughly, you do not have the faintest idea what you have done. Look at the recall of the EDO4: after that mouthpiece killed one or two people.

It is your life, but I have stopped diving things that come from tiny design shops, no matter how big their factor is, at least on my main breathing loop. I put that down to experience.

Home build is one thing, but best to start by building and proving your test equipment, then design your accessory or Rebreather, IMHO.

Alex

if you want to know my opinion , I think that some persons involved in the rebreather market like to come in the home builder world and on the rebreathers forums criticise all they can criticise.

mabye is pvc dangerous, but this is the way that it is said that I dislike

they never say , hi guys just to let you know in our company we found out that pvc is bad try to find something else.

no they always say, building rebreather is a serious matter not a garage game on they other hand we can make good rebreather EC compliant bla bla bla.... heu how many people were killed by EC appouved rebreather ?

we are still waiting for the miraculous rebreather, for the technologic revolution.....

Just wanted to go out on a limb and add a little here.... My original objection really had nothing to do with the use of PVC. I have extensions and 90's on the way from Tecme right now. I'm sure using PVC is fine as long as it is done properly. Look at all the gear now, it's usually made of some type of plastic. Has to be related to PVC??? My issue was attempting to make life support equipment from hardware store parts. It struck me as risky at best, if not out right dangerous. I sent a PM to Dave Sutton with the details, but I had first hand knowledge of a Rebreather diver on a homebuild who was killed due to a failure of his breathing/air delivery system. It was nearly 20 years ago when I was a newbie diver. I didn't know anything about Rebreather's, only that his homemade unit cost him his life. It has stuck with me all these years. When I saw the post of someone wanting to make their own rig, I piped up. I thought I was helping keep a fellow diver safe. As it turns out, homemade DSV's are quite common, I just didn't know it until this thread. I love to design and build things. I am genuinely impressed with some of the homebuilt units I've seen on Rebreather World. I have been working on my own Dolphin based homebuild unit for the past few months. I'm quite sure that as another poster said, many of the ideas and designs started in someone's garage as projects. If it works for you....great! *I*personally would not choose a homemade DSV. Just my opinion. FD

... Take PVC to start with. Put it into a chamber with a window in it. Blow down, bring it back to surface. Watch it smoke on the way back up, especially with helium: literally the gases that come off it often look like smoke (I must post some pics!). Now try to google something like "PVC Greenpeace" and then "MSDS PVC", and look what you are breathing in. Nothing to worry about right now, but it will not help you attain much in the way of old age.
...
Alex