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Re: [PSUBS-MAILIST] Hydrogen Build-up



odorless, colorless, tasteless plus deadly and silent--given the wrong circumstances.
Vance 
 
-----Original Message-----
From: Ray Keefer <psubs2001@yahoo.com>
To: personal_submersibles@psubs.org
Sent: Wed, 12 Apr 2006 12:54:28 -0700 (PDT)
Subject: Re: [PSUBS-MAILIST] Hydrogen Build-up

Hi,

"whiff of hydrogen"?

I had always assumed you couldn't smell hydrogen. Does
anyone know one way or the other?

Thanks,
Ray

--- "Dan H." <jmachine@adelphia.net> wrote:

> Steve,
> 
> I'm not a battery expert and wasn't going to respond
> to this thread but since your life may hang in the
> balance, I'll respond. :-)
> 
> Most of the hydrogen produced from batteries is
> produced on charging.  Some is produced on
> discharging, but not much.  No matter whether
> charging or discharging, there is always hydrogen
> present at the top of each cell within the battery
> and it oozes out.  
> 
> It's best to keep the batteries away from anything
> that could possible ignite it, or in a safe place
> incase they do go off.  That's one advantage of
> having them in a separate pod.  The other advantage
> is the room it frees up in the hull.  The
> disadvantages are, some method of venting while
> charging has to be provided for and a battery in a
> pod isn't as easily gotten to for service.  Also
> there are weight factors and the expense of a
> separate pressure pod etc. etc.
> 
> There are Hydrocaps available which absorb the
> hydrogen, and convert it to water I believe, but
> they have their flaws too.  I don't know of a
> scrubber for a battery pod, but it sounds plausible.
>  
> 
> My batteries are in pods, and don't have Hydrocaps
> but I have pod vent caps I open while charging.  The
> vents vent into the hull so I can charge while in
> the water but I must leave the sub hatch opened. 
> While in use, the vents are capped off with heavy
> pipe caps.  The end of each battery pod on my sub
> are made so an explosion will blow the pod end off,
> and hopefully not impact the hull.
> 
> One thing I've noticed is, I don't get a whiff of
> hydrogen when I open my pod vents after use and
> before charging.  So I assume what I was told about
> most of the hydrogen being produced during charging,
> and not while in use, is true.  
> 
> Damn I'm long winded, but hey, if it could save a
> life, I'll talk!  ;-)  
> 
> Take care, Dan H.
> 
> 
>   ----- Original Message ----- 
>   From: Stephen Pearce 
>   To: personal_submersibles@psubs.org 
>   Sent: Wednesday, April 12, 2006 4:51 AM
>   Subject: [PSUBS-MAILIST] Hydrogen Build-up
> 
> 
>   G-day all
> 
>    
> 
>   From the material I have been reading and what I
> remember Hydrogen gas is formed in lead acid
> batteries when charging and dischrgeing. My
> understanding is that if you ventilate the battery
> compartment  with the atmosphere when running on the
> surface and the air in the pressure hull when
> submerged this can stop a BIG BANG! 
> 
>    
> 
>   Can anyone suggest the amount of Hydrogen as a %
> of the Subs atmosphere is required for an explosion
> to occour? Is there such a thing as a Hydrogen
> Scrubber? Is hydrogen produced more readerly when
> charging or discharging the batteries.
> 
>    
> 
>   By contributing to this string the life you save
> could be mine<J
> 
>    
> 
>   Regards
> 
>    
> 
>   Steve P
> 


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