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Hi again Glyn,
See my other post, but I have the same problem with ambient temperature =
and high humidity here in Darwin, and need to run the compressor in an =
airconditioned room!
And again, that I why I have avoided running Helium thro' it.
Sounds like we need to source helium.
Where are you in Thailand, we can chat off the list?
Thanks,
Jeff the Darwinian.
----- Original Message -----=20
From: Glyn Evans=20
To: Scott Hunsucker ; Dean Laffan ; Rich Gulley ; trey@ne*.co* ; =
Tech Diver=20
Sent: Tuesday, April 02, 2002 2:04 PM
Subject: Re: Helium Pumping
Thanks for everyone on the list for a real quick response to this.
=20
I use a cascade for O2, it's also very cheap here in Thailand but the =
He is pricey and the supply pressure is only 2000psi therefore I would =
need a alot of cylinders to make an effective cascade. If the compressor =
can take it then that's the only real effective way without a Haskell.
What worries me is how hot the compressor would get, we have high =
ambient temps here anyway (32 oC).
BTW, I will only be pumping pure He, I heard a while ago that some =
idiot tried this with pure O2. I don't need to tell you the outcome!!
=20
I must also apologise to the list as I think I sent my mail requesting =
a read receipt, so sorry in advance for the hassle.=20
=20
Glyn.
----- Original Message -----=20
From: Rich Gulley=20
To: Glyn Evans=20
Sent: Tuesday, April 02, 2002 11:04 AM
Subject: Re: Helium Pumping
Hi Glyn,
Are you trying to boost pure He or are you taking trimix and pumping =
it from one set of twins to another?=20
I would recommend getting a helium analyzer if you are trying to do =
the latter. Second I've heard this may make your compressor quite hot =
doing this.=20
There is a small group of us, (3) who spend several hundred dollars =
a month on helium. We use a cascade system and have no need for a =
booster pump or the use of a compressor to boost the He (we get our He =
at 3000psi). For the cost of a booster pump I can purchase a lot of =
storage bottles.
=20
Hope this helps.
Rich=20
----- Original Message -----=20
From: Glyn Evans=20
To: Techdiver@Aquanaut.Com=20
Sent: Monday, April 01, 2002 6:37 PM
Subject: Helium Pumping
Hi List,
=20
I am trying to pump Helium although I do not have access to =
booster pump. I have read (in the excellent O2 hackers guide) that it is =
possible by allowing the He to expand to Atmospheric pressure and then =
recompressing it with a normal compressor. Also using a bladder in =
between the cylinder and compressor inlet to regulate the feed pressure.
I was wondering if anyone on the list had actually got any =
experience in doing this and could offer advice.
=20
Thanks in advance
Glyn.
=20
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi again Glyn,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>See my other post, but I have the same =
problem with=20
ambient temperature and high humidity here in Darwin, and need to run =
the=20
compressor in an airconditioned room!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>And again, that I why I have avoided =
running Helium=20
thro' it.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Sounds like we need to source =
helium.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Where are you in Thailand, we can chat =
off the=20
list?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Thanks,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Jeff the Darwinian.</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:gevans@cs*.co*" title=3Dgevans@cs*.co*>Glyn =
Evans</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:shunsucker@co*.ne*"=20
title=3Dshunsucker@co*.ne*>Scott Hunsucker</A> ; <A=20
href=3D"mailto:email@re*.co*.au*" =
title=3Demail@re*.co*.au*>Dean=20
Laffan</A> ; <A href=3D"mailto:richgulley@qw*.ne*"=20
title=3Drichgulley@qw*.ne*>Rich Gulley</A> ; <A =
href=3D"mailto:trey@ne*.co*"=20
title=3Dtrey@ne*.co*>trey@netdor.com</A> ; <A=20
href=3D"mailto:techdiver@aquanaut.com" =
title=3Dtechdiver@aquanaut.com>Tech=20
Diver</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, April 02, 2002
=
2:04=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Helium =
Pumping</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D2>Thanks for everyone on the list for a real quick =
response to=20
this.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I use a cascade for O2, it's also very cheap here =
in=20
Thailand but the He is pricey and the supply pressure is only 2000psi=20
therefore I would need a alot of cylinders to make an effective =
cascade. If=20
the compressor can take it then that's the only real effective way =
without a=20
Haskell.</FONT></DIV>
<DIV><FONT size=3D2>What worries me is how hot the compressor would =
get, we have=20
high ambient temps here anyway (32 oC).</FONT></DIV>
<DIV><FONT size=3D2>BTW, I will only be pumping pure He, I heard =
a while=20
ago that some idiot tried this with pure O2. I don't need to tell you =
the=20
outcome!!</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I must also apologise to the list as I think I =
sent my mail=20
requesting a read receipt, so sorry in advance for the hassle. =
</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Glyn.</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:richgulley@qw*.ne*" =
title=3Drichgulley@qw*.ne*>Rich=20
Gulley</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:gevans@cs*.co*"=20
title=3Dgevans@cs*.co*>Glyn Evans</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, April 02,
2002 =
11:04=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Helium =
Pumping</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Hi Glyn,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Are you trying to boost =
pure He or=20
are you taking trimix and pumping it from one set of twins to =
another?=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I would recommend getting a helium =
analyzer if=20
you are trying to do the latter. Second I've heard this may =
make your=20
compressor quite hot doing this. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>There is a small group of us, (3) =
who spend=20
several hundred dollars a month on helium. We use a cascade system =
and have=20
no need for a booster pump or the use of a compressor to boost the =
He (we=20
get our He at 3000psi). For the cost of a booster pump I can =
purchase a lot=20
of storage bottles.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Hope this helps.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Rich </FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- =
</DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:gevans@cs*.co*" =
title=3Dgevans@cs*.co*>Glyn Evans</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:Techdiver@Aquanaut.Com"=20
title=3Dtechdiver@aquanaut.com>Techdiver@Aquanaut.Com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, April 01, =
2002 6:37=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Helium =
Pumping</DIV>
<DIV><BR></DIV>
<DIV><FONT size=3D2>Hi List,</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>I am trying to pump Helium although I do not =
have access=20
to booster pump. I have read (in the excellent O2 hackers =
guide) that=20
it is possible by allowing the He to expand to Atmospheric =
pressure and=20
then recompressing it with a normal compressor. Also using a =
bladder in=20
between the cylinder and compressor inlet to regulate the feed=20
pressure.</FONT></DIV>
<DIV><FONT size=3D2>I was wondering if anyone on the list had =
actually got=20
any experience in doing this and could offer =
advice.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Thanks in advance</FONT></DIV>
<DIV><FONT size=3D2>Glyn.</FONT></DIV>
<DIV><FONT=20
size=3D2></FONT> </DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOT
E></BODY=
></HTML>
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