RE: [PSUBS-MAILIST] New to the list and to Personal subs!

["Rob Teed" <robteed@netzero.net>]

In reply to #1
 This is true....
 #2 If you fill the Tank with water the Fumes will be
 gone...no risk of explosion left after draining the
 water...If there is an odor left its the additive that
 gives propane its smell...
 #3 OK...so what if you do?
 #4 Most propane tanks are setup on a site filled with
 propane then just set there...what abuse?????? What
 stress?
 5# Seems to me with proper bracing from the inside the
 Sub Designer would take this into account.
As for the second part of the post....The questions
 rasied are the same. Can't crush depth be determined
 by putting the sub on a cable and sending the sub
 unmaned to a point say two or three times past the
 depth you will operate the sub??????
And I guess we all " Want to die" cause no homebuilt
 sub is 100% safe.
Last but not least...I have seen alot of subs on the net
 that were made out of propane tanks....Anyone ever
 hear of them imploding???? I know a guy here in Michigan
 died when he had trouble with a porthole bursting ( I
 think thats what the reason was ). But lets get some
 facts here before we discourage anyone from building a
 sub....
I don't have a sub...am planing to build the AQUASUB
 which is alot safer in my mind then those you guys
 are building...my friends say I will die in it...
Lets get some facts up here guys...
Thanks,
     Rob Teed
> Ooooh. You just asked one of the biggest debateable questions on PSUBS!
> Many of us don't recommend propane tanks since:
> 1. You really don't know the metalergy. By the time you send out a sample
>    to get tested you could of had a custom hull.
> 2. Fumes in a used tank could be explosive.
> 3. You have to pass all your ribs and bracing down the conning tower.
>    In a custom hull you can bring materials in through an open end.
> 4. You don't know the stress, strain, or abuse that tank has been through.
> 5. Propane tanks were not design to keep external pressures out,
> just to keep
>    internal pressures in.
>
> Others say, hey, it's ok if:
>
> 1. You are very conservitive. In other words derate seriously. Like if you
>    figure it's crush depth (hard to guess at one unless you know the
>    metalurgy and tempering) then operate at 20% of that.
> 2. Use only new tanks.
> 3. You can use used tanks but derate even more and figure out how
> to remove
>    the propane fumes BEFORE welding or torching!
> 4. You WANT to die. :)
>

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