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Thanks for everyone on the list for a real quick response to this.
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!!
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
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.
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,
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.
Thanks in advance
Glyn.
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<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
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<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<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 =
Thailand=20
but the He is pricey and the supply pressure is only 2000psi therefore I =
would=20
need a alot of cylinders to make an effective cascade. If the compressor =
can=20
take it then that's the only real effective way without a =
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 ago=20
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"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-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 title=3Drichgulley@qw*.ne* =
href=3D"mailto:richgulley@qw*.ne*">Rich=20
Gulley</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dgevans@cs*.co*=20
href=3D"mailto:gevans@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 are=20
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 no=20
need for a booster pump or the use of a compressor to boost the He (we =
get our=20
He at 3000psi). For the cost of a booster pump I can purchase a lot of =
storage=20
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"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-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 title=3Dgevans@cs*.co* href=3D"mailto:gevans@cs*.co*">Glyn =
Evans</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dtechdiver@aquanaut.com=20
href=3D"mailto:Techdiver@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 then=20
recompressing it with a normal compressor. Also using a bladder in =
between=20
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 any=20
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 =
size=3D2></FONT> </DIV></BLOCKQUOTE></BLOCKQUOTE></BODY><
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