Home » Public Forums » GMCnet » Re: [GMCnet] Propane tank inspection
| Re: [GMCnet] Propane tank inspection [message #233533] |
Fri, 20 December 2013 08:23  |
scott cowden
Messages: 170
Registered: February 2004
Karma: 0
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Senior Member |
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Boy, I'm not the world's No. 1 expert on this, but isn't there some sort of cardinal rule to NEVER put oil on the threads of compressed gas cylinders, or does that only apply to oxygen cylinders?
Scott
'74 x-Glacier
Newmarket ON
> From: robmueller@iinet.net.au
> To: gmclist@temp.gmcnet.org
> Date: Sat, 21 Dec 2013 00:39:31 +1100
> Subject: Re: [GMCnet] Propane tank inspection
>
> John,
>
> It might be a good idea to squirt it with some kind of penetrating oil to loosen it up.
>
> To demonstrate an acute grasp on the obvious, do this outdoors if the tank has LPG in it.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: John R. Lebetski
>
> Got it. I think mine needs to be unstuck. Emery's explanation matches the Menards guy story. Maybe a plier and rag to exercise it
> once is all it needs.
> --
> John
>
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| Re: [GMCnet] Propane tank inspection [message #233538 is a reply to message #233533] |
Fri, 20 December 2013 12:22  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Scott,
That is the cardinal rule for O2 cylinders, NO Petroleum base lubricants. Clean and dry fittings for O2. Propane is a petroleum product.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Dec 20, 2013, at 9:23 AM, scott cowden <scottyforsail@hotmail.com> wrote:
>
>
> Boy, I'm not the world's No. 1 expert on this, but isn't there some sort of cardinal rule to NEVER put oil on the threads of compressed gas cylinders, or does that only apply to oxygen cylinders?
>
> Scott
>
> '74 x-Glacier
> Newmarket ON
>
>> From: robmueller@iinet.net.au
>> To: gmclist@temp.gmcnet.org
>> Date: Sat, 21 Dec 2013 00:39:31 +1100
>> Subject: Re: [GMCnet] Propane tank inspection
>>
>> John,
>>
>> It might be a good idea to squirt it with some kind of penetrating oil to loosen it up.
>>
>> To demonstrate an acute grasp on the obvious, do this outdoors if the tank has LPG in it.
>>
>> Regards,
>> Rob M.
>>
>> -----Original Message-----
>> From: John R. Lebetski
>>
>> Got it. I think mine needs to be unstuck. Emery's explanation matches the Menards guy story. Maybe a plier and rag to exercise it
>> once is all it needs.
>> --
>> John
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
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>
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Propane tank inspection [message #233553 is a reply to message #233533] |
Fri, 20 December 2013 16:57 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Scott,
You are correct; it only applies to oxygen cylinders.
BTW I have some degree of expertise as I was a USAF Mechanical Accessories Repairman (AFSC/MOS 42251). That career field was
responsible for the maintenance and repair of oxygen supply systems; gaseous and liquid. As a Field Service Rep for Hamilton
Standard (manufactured the Portable Life Support System that the Astronauts wore when strolling around the Moon) supplied pure
oxygen to the space suit for them to them to breathe at 4.0 psi.
Oil and oxygen don't mix, should any lubrication be required non flammable silicone based lubricants are used.
Regards,
Rob M.
-----Original Message-----
From: scott cowden
Boy, I'm not the world's No. 1 expert on this, but isn't there some sort of cardinal rule to NEVER put oil on the threads of
compressed gas cylinders, or does that only apply to oxygen cylinders?
Scott
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Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Propane tank inspection [message #233572 is a reply to message #233553] |
Sat, 21 December 2013 00:28 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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Rob, I thought the Apolo suits were 3.2psi, the Shuttle suits were 4psi.
But that is a memory from one or two things decades ago.
But wow, what a thing!
On Fri, Dec 20, 2013 at 2:57 PM, Robert Mueller <robmueller@iinet.net.au>wrote:
> Scott,
>
> You are correct; it only applies to oxygen cylinders.
>
> BTW I have some degree of expertise as I was a USAF Mechanical Accessories
> Repairman (AFSC/MOS 42251). That career field was
> responsible for the maintenance and repair of oxygen supply systems;
> gaseous and liquid. As a Field Service Rep for Hamilton
> Standard (manufactured the Portable Life Support System that the
> Astronauts wore when strolling around the Moon) supplied pure
> oxygen to the space suit for them to them to breathe at 4.0 psi.
>
> Oil and oxygen don't mix, should any lubrication be required non flammable
> silicone based lubricants are used.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: scott cowden
>
> Boy, I'm not the world's No. 1 expert on this, but isn't there some sort
> of cardinal rule to NEVER put oil on the threads of
> compressed gas cylinders, or does that only apply to oxygen cylinders?
>
> Scott
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Plato seems wrong to me today.
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| Re: [GMCnet] Propane tank inspection [message #233574 is a reply to message #233572] |
Sat, 21 December 2013 01:36 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Ron,
I too "spoke" from memory but mine is from FOUR decades ago! My penchant to provide correct information has forced me to dig up my
Apollo Portable Life Support Systems handbook to verify what I noted.
The Primary Oxygen Regulator Assembly specs note:
Operating pressure: 0 to 1500 psig (that's the oxygen supply bottle pressure)
Regulating pressure: With reference pressure of lunar vacuum outlet pressure is maintained at 3.75 to 4.05 psid for O2 flow between
0 and 3.8 lb/hr.
Digging into the dusty corners of my brain back to my USAF Mechanical Accessories Repairman Tech School IIRC 3.75 psia is the lowest
pressure the human body can without having one's blood boil (gasses - mainly nitrogen - come out of solution). Military aircraft
have a setting on their pressurization control panel called COMBAT. This drops the cabin pressure from 7.5 (IIRC) to 3.75. This is
so that if the cockpit gets shot up the forces that want to blow out the cockpit are greatly reduced. However, when the crew
switches to COMBAT they must also don oxygen masks as there isn't enough oxygen content in the air at 3.75 psia for us to survive.
Commercial airliners are pressurized to around 8.5 psi for passenger comfort: http://en.wikipedia.org/wiki/Cabin_pressurization
Regards,
Rob M.
-----Original Message-----
From: Ronald Pottol
Rob, I thought the Apolo suits were 3.2psi, the Shuttle suits were 4psi.
But that is a memory from one or two things decades ago.
But wow, what a thing!
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Propane tank inspection [message #233577 is a reply to message #233574] |
Sat, 21 December 2013 07:49 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Robert Mueller wrote on Sat, 21 December 2013 02:36 |
Ron,
I too "spoke" from memory but mine is from FOUR decades ago! My penchant to provide correct information has forced me to dig up my Apollo Portable Life Support Systems handbook to verify what I noted.
The Primary Oxygen Regulator Assembly specs note:
Operating pressure: 0 to 1500 psig (that's the oxygen supply bottle pressure)
Regulating pressure: With reference pressure of lunar vacuum outlet pressure is maintained at 3.75 to 4.05 psid for O2 flow between 0 and 3.8 lb/hr.
Digging into the dusty corners of my brain back to my USAF Mechanical Accessories Repairman Tech School IIRC 3.75 psia is the lowest pressure the human body can without having one's blood boil (gasses - mainly nitrogen - come out of solution). Military aircraft have a setting on their pressurization control panel called COMBAT. This drops the cabin pressure from 7.5 (IIRC) to 3.75. This is so that if the cockpit gets shot up the forces that want to blow out the cockpit are greatly reduced. However, when the crew switches to COMBAT they must also don oxygen masks as there isn't enough oxygen content in the air at 3.75 psia for us to survive.
Commercial airliners are pressurized to around 8.5 psi for passenger comfort: http://en.wikipedia.org/wiki/Cabin_pressurization
Regards,
Rob M.
-----Original Message-----
From: Ronald Pottol
Rob, I thought the Apolo suits were 3.2psi, the Shuttle suits were 4psi.
But that is a memory from one or two things decades ago.
But wow, what a thing!
|
This is fun.
You guys are both right, but it seems as though you have missed the reasons which are the real interesting part to me and maybe others as well.
The "cabin altitude" of a commercial airliner is never above 12,000ft. Yes, this about the 8.5psia noted. This is simply because that is the highest that people still function in the atmosphere's mixture.
*** Caution, true engineering data follows, but some of the values have been rounded because I didn't fell like doing the arithmetic this morning. ****
FL = Flight level. altitude as determined by a mechanical altimeter set to 29.96"Hg
MSL = mean sea level
psia = pressure in pounds per square as absolute (not referenced to local pressure
Gasses function pretty much at their partial pressures. This is how an absorption refrigerator can make ammonia absorb heat in a constant pressure system and why water evaporates at room temperature. So, a human needs O2 at about 2psia to get it absorbed into the blood. This is why a pilot of a non-pressurized aircraft is only allowed FL10K, but can go to 12K but only one hour without oxygen. Hypoxia won't kill you right away, but it does make you stupid - fast.
The sea level partial pressure of O2 is about 3psia, at 10Kmsl it is only about 2psia. Atmospheric pressure is about 10psia. So, a body breathing pure O2 there is happy. That works up to about FL43K. The problem there is two fold. At 43K, the "partial" (it isn't partial anymore) pressure of 100% O2 is now down to that 2psia number again and worse is that there isn't enough local pressure for a body to be able to make lungs work properly. This is why high flying pilots (like U2 and SR71) actually wear what amount to space suits.
This is also why the US will not allow aircraft to operate over FL43K. If they depressurize, pure O2 won't keep the passengers alive.
This was all stuff figured out by NACA (the precursor to NASA) a very long time ago.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Propane tank inspection [message #233609 is a reply to message #233533] |
Sat, 21 December 2013 11:48 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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Talk about propane I filled my tank yesterday the tech says what is that little screw for doesn't the tank stop filling when it is full? Scary I said no just turn off your valve when it starts misting!
Roy Keen
Minden,NV
76 X Glenbrook
[Updated on: Sat, 21 December 2013 11:49] Report message to a moderator |
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| Re: [GMCnet] Propane tank inspection [message #233615 is a reply to message #233609] |
Sat, 21 December 2013 12:22 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Roy,
There are scary people out there that have no idea what they are doing.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Dec 21, 2013, at 12:48 PM, roy@gmcnet.org wrote:
>
>
> Talk about propane I filled my tank yesterday the tech says what is that little screw for doesn't the tank stop filling wen it is full? Scary I said no just turn off your valve when it starts misting!
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
> _______________________________________________
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] Propane tank inspection [message #233630 is a reply to message #233577] |
Sat, 21 December 2013 14:51 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Matt,
It appears you didn't read the link which noted:
Need for cabin pressurization
Pressurization becomes necessary at altitudes above 12,500 feet (3,800 m) to 14,000 feet (4,300 m) above sea level to protect crew
and passengers from the risk of a number of physiological problems caused by the low outside air pressure above that altitude; it
also serves to generally increase passenger comfort. The principal physiological problems are as follows:
Hypoxia. The lower partial pressure of oxygen at altitude reduces the alveolar oxygen tension in the lungs and subsequently in the
brain, leading to sluggish thinking, dimmed vision, loss of consciousness, and ultimately death. In some individuals, particularly
those with heart or lung disease, symptoms may begin as low as 5,000 feet (1,500 m), although most passengers can tolerate altitudes
of 8,000 feet (2,400 m) without ill effect. At this altitude, there is about 25% less oxygen than there is at sea level.[2] Hypoxia
may be addressed by the administration of supplemental oxygen, either through an oxygen mask or through a nasal cannula. Without
pressurization, sufficient oxygen can be delivered up to an altitude of about 40,000 feet (12,000 m). This is because a person who
is used to living at sea level needs about 0.20 bar partial oxygen pressure to function normally and that pressure can be maintained
up to about 40,000 feet (12,000 m) by increasing the mole fraction of oxygen in the air that is being breathed. At 40,000 feet
(12,000 m) the ambient air pressure falls to about 0.2 bar and to maintain a minimum partial pressure of oxygen of 0.2 bar requires
breathing 100% oxygen using a oxygen mask. Emergency oxygen supply masks in the passenger compartment of airliners do not need to be
pressure-demand masks because most flights stay below 40,000 feet (12,000 m). Above that altitude the partial pressure of oxygen
will fall below 0.2 bar even at 100% oxygen and some degree of cabin pressurization or rapid descent is essential to avoid the risk
of hypoxia.
Regards,
Rob M.
-----Original Message-----
From: Matt Colie
> Commercial airliners are pressurized to around 8.5 psi for passenger comfort: http://en.wikipedia.org/wiki/Cabin_pressurization
>
> Regards,
> Rob M.
>
This is fun.
You guys are both right, but it seems as though you have missed the reasons which are the real interesting part to me and maybe
others as well.
The "cabin altitude" of a commercial airliner is never above 12,000ft. Yes, this about the 8.5psia noted. This is simply because
that is the highest that people still function in the atmosphere's mixture.
*** Caution, true engineering data follows, but some of the values have been rounded because I didn't fell like doing the arithmetic
this morning. ****
FL = Flight level. altitude as determined by a mechanical altimeter set to 29.96"Hg
MSL = mean sea level
psia = pressure in pounds per square as absolute (not referenced to local pressure
Gasses function pretty much at their partial pressures. This is how an absorption refrigerator can make ammonia absorb heat in a
constant pressure system and why water evaporates at room temperature. So, a human needs O2 at about 2psia to get it absorbed into
the blood. This is why a pilot of a non-pressurized aircraft is only allowed FL10K, but can go to 12K but only one hour without
oxygen. Hypoxia won't kill you right away, but it does make you stupid - fast.
The sea level partial pressure of O2 is about 3psia, at 10Kmsl it is only about 2psia. Atmospheric pressure is about 10psia. So, a
body breathing pure O2 there is happy. That works up to about FL43K. The problem there is two fold. At 43K, the "partial" (it
isn't partial anymore) pressure of 100% O2 is now down to that 2psia number again and worse is that there isn't enough local
pressure for a body to be able to make lungs work properly. This is why high flying pilots (like U2 and SR71) actually wear what
amount to space suits.
This is also why the US will not allow aircraft to operate over FL43K. If they depressurize, pure O2 won't keep the passengers
alive.
This was all stuff figured out by NACA (the precursor to NASA) a very long time ago.
Matt
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Propane tank inspection [message #233631 is a reply to message #233630] |
Sat, 21 December 2013 14:56 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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Senior Member |
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Ron
I'll try to remember all of that when I get my GMC above 14,000 feet.
Emery Stora
On Dec 21, 2013, at 1:51 PM, Robert Mueller <robmueller@iinet.net.au> wrote:
> Matt,
>
> It appears you didn't read the link which noted:
>
> Need for cabin pressurization
>
> Pressurization becomes necessary at altitudes above 12,500 feet (3,800 m) to 14,000 feet (4,300 m) above sea level to protect crew
> and passengers from the risk of a number of physiological problems caused by the low outside air pressure above that altitude; it
> also serves to generally increase passenger comfort. The principal physiological problems are as follows:
>
> Hypoxia. The lower partial pressure of oxygen at altitude reduces the alveolar oxygen tension in the lungs and subsequently in the
> brain, leading to sluggish thinking, dimmed vision, loss of consciousness, and ultimately death. In some individuals, particularly
> those with heart or lung disease, symptoms may begin as low as 5,000 feet (1,500 m), although most passengers can tolerate altitudes
> of 8,000 feet (2,400 m) without ill effect. At this altitude, there is about 25% less oxygen than there is at sea level.[2] Hypoxia
> may be addressed by the administration of supplemental oxygen, either through an oxygen mask or through a nasal cannula. Without
> pressurization, sufficient oxygen can be delivered up to an altitude of about 40,000 feet (12,000 m). This is because a person who
> is used to living at sea level needs about 0.20 bar partial oxygen pressure to function normally and that pressure can be maintained
> up to about 40,000 feet (12,000 m) by increasing the mole fraction of oxygen in the air that is being breathed. At 40,000 feet
> (12,000 m) the ambient air pressure falls to about 0.2 bar and to maintain a minimum partial pressure of oxygen of 0.2 bar requires
> breathing 100% oxygen using a oxygen mask. Emergency oxygen supply masks in the passenger compartment of airliners do not need to be
> pressure-demand masks because most flights stay below 40,000 feet (12,000 m). Above that altitude the partial pressure of oxygen
> will fall below 0.2 bar even at 100% oxygen and some degree of cabin pressurization or rapid descent is essential to avoid the risk
> of hypoxia.
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Matt Colie
>
>> Commercial airliners are pressurized to around 8.5 psi for passenger comfort: http://en.wikipedia.org/wiki/Cabin_pressurization
>>
>> Regards,
>> Rob M.
> This is fun.
> You guys are both right, but it seems as though you have missed the reasons which are the real interesting part to me and maybe
> others as well.
>
> The "cabin altitude" of a commercial airliner is never above 12,000ft. Yes, this about the 8.5psia noted. This is simply because
> that is the highest that people still function in the atmosphere's mixture.
>
> *** Caution, true engineering data follows, but some of the values have been rounded because I didn't fell like doing the arithmetic
> this morning. ****
> FL = Flight level. altitude as determined by a mechanical altimeter set to 29.96"Hg
> MSL = mean sea level
> psia = pressure in pounds per square as absolute (not referenced to local pressure
>
> Gasses function pretty much at their partial pressures. This is how an absorption refrigerator can make ammonia absorb heat in a
> constant pressure system and why water evaporates at room temperature. So, a human needs O2 at about 2psia to get it absorbed into
> the blood. This is why a pilot of a non-pressurized aircraft is only allowed FL10K, but can go to 12K but only one hour without
> oxygen. Hypoxia won't kill you right away, but it does make you stupid - fast.
>
> The sea level partial pressure of O2 is about 3psia, at 10Kmsl it is only about 2psia. Atmospheric pressure is about 10psia. So, a
> body breathing pure O2 there is happy. That works up to about FL43K. The problem there is two fold. At 43K, the "partial" (it
> isn't partial anymore) pressure of 100% O2 is now down to that 2psia number again and worse is that there isn't enough local
> pressure for a body to be able to make lungs work properly. This is why high flying pilots (like U2 and SR71) actually wear what
> amount to space suits.
>
> This is also why the US will not allow aircraft to operate over FL43K. If they depressurize, pure O2 won't keep the passengers
> alive.
>
> This was all stuff figured out by NACA (the precursor to NASA) a very long time ago.
>
> Matt
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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| Re: [GMCnet] Propane tank inspection [message #233637 is a reply to message #233574] |
Sat, 21 December 2013 15:28 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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Yeah, then I wonder what the shuttle suits ran? I know they were a higher
pressure (which made them stiffer, but reduced the time you had to be on
pure O2 before you could get in one).
It all gets surprisingly complex, us monkeys are meant for something not
too far from sea level.
On Fri, Dec 20, 2013 at 11:36 PM, Robert Mueller <robmueller@iinet.net.au>wrote:
> Ron,
>
> I too "spoke" from memory but mine is from FOUR decades ago! My penchant
> to provide correct information has forced me to dig up my
> Apollo Portable Life Support Systems handbook to verify what I noted.
>
> The Primary Oxygen Regulator Assembly specs note:
>
> Operating pressure: 0 to 1500 psig (that's the oxygen supply bottle
> pressure)
>
> Regulating pressure: With reference pressure of lunar vacuum outlet
> pressure is maintained at 3.75 to 4.05 psid for O2 flow between
> 0 and 3.8 lb/hr.
>
> Digging into the dusty corners of my brain back to my USAF Mechanical
> Accessories Repairman Tech School IIRC 3.75 psia is the lowest
> pressure the human body can without having one's blood boil (gasses -
> mainly nitrogen - come out of solution). Military aircraft
> have a setting on their pressurization control panel called COMBAT. This
> drops the cabin pressure from 7.5 (IIRC) to 3.75. This is
> so that if the cockpit gets shot up the forces that want to blow out the
> cockpit are greatly reduced. However, when the crew
> switches to COMBAT they must also don oxygen masks as there isn't enough
> oxygen content in the air at 3.75 psia for us to survive.
>
> Commercial airliners are pressurized to around 8.5 psi for passenger
> comfort: http://en.wikipedia.org/wiki/Cabin_pressurization
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: Ronald Pottol
>
> Rob, I thought the Apolo suits were 3.2psi, the Shuttle suits were 4psi.
> But that is a memory from one or two things decades ago.
>
> But wow, what a thing!
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Plato seems wrong to me today.
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1973 26' GM outfitted
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| Re: [GMCnet] Propane tank inspection [message #233639 is a reply to message #233637] |
Sat, 21 December 2013 15:52 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
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|
Ron,
I left the Johnson Space Center in 1978 to take up a job in Paris, France as an Field Rep so I didn't really work on the Shuttle
program much.
The Shuttle suits were a completely different design. Apollo suits were custom tailored for each astronaut. The Shuttle suits were
mix and match pieces. The Apollo suits were all fabric; the Shuttle suits had a Hard Upper Torso (HUT). There were different size
parts for the arms, lower torso, legs, boots that "plugged" into the HUT.
Here's a link to an article that discusses space suits from A to Z. It notes that the Shuttle suits operated at 4.3 psi:
http://www.howstuffworks.com/space-suit1.htm
Regards,
Rob M.
-----Original Message-----
From: Ronald Pottol
Yeah, then I wonder what the shuttle suits ran? I know they were a higher
pressure (which made them stiffer, but reduced the time you had to be on
pure O2 before you could get in one).
It all gets surprisingly complex, us monkeys are meant for something not
too far from sea level.
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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