On 05/07/2019 4:41 PM, Paul wrote:
Rene Lamontagne wrote:
On 05/07/2019 3:34 PM, Lynn McGuire wrote:
On 5/7/2019 2:51 AM, Paul wrote:
Lynn McGuire wrote:

Sure, we could use hydrogen for hard drive cooling.Â* Older power
plant generators use pure hydrogen gas for cooling.Â* With a very
involved purging and oil based sealing process.Â* Of course,
hydrogen filled hard drives could bring back excitement to
computing when they have a containment breach.

Lynn


I've been burned by hydrogen. I have "experience" :-(

Unfortunately, the Hydrogen reacts with some of the
metals, whereas the Helium is nicely inert.

Hydrogen is also exothermic upon expansion, so if a
hole develops in a high pressure cylinder, the
stream of gas should self ignite from the heat.
Many years ago, they experimented with zeolite filled
cylinders, to reduce the rate of gas escape from
high pressure hydrogen cylinders. You could shoot a cylinder
with a high power rifle, and the gas stream was
gentle enough (because of the zeolite rate limiting)
to not catch fire. Until someone smoking a cigarette
sets it off, of course. Then if you're in a contained
area, look out.

If you order a cylinder of hydrogen from Liquid Air,
of course that won't have any rate limiting. Just
whatever your gas regulator might apply. The zeolite
experiment was intended as a solution for carrying
the gas in a moving vehicle, as a fuel store.

Â*Â*Â* Paul

Hydrogen just wants to be free !

I used to buy 30 to 50 high pressure cylinders of hydrogen from Air
Liquide a month.Â* You've never lived until your cylinder farm rots
through the piping and vents to atmosphere one day.

Lynn

On a small scale, back when I was an automotive mechanic in the dead
of winter I had put a fast charger on a cars dead battery outside near
the fence where the ac plugs where, after about an hour I went out to
shut down and remove the charger in the dark, Inadvertently I must
have hit the metal hold down and the plus+ terminal with the charger
clip and caused a spark.
Well all that freshly produced hydrogen in the empty space in the
battery blew and threw parts of the battery top and a good batch of
sulfuric acid in my face, I ran like hell back into the garage and
grabbed the water hose and doused my face and front with plenty of
cold water.
For the first time ever I was lucky I wore glasses and did not get any
in my Eyes.
Since then I have had a great respect for hydrogen gas.

Rene

Why is it, we always learn how evil hydrogen is, the hard way :-/

Â*Â* Paul

I Dunno! lots of things in this life we seem to learn the hard way. :-(

Rene