[SBE] nitrogen

[Larry Will]

In line with Barry said about N1Hi.

Wasn't the original question about "has anyone used nitrogen instead 
of dry air for pressurization of MW lines?

and WHY has NO ONE answered the question - a common problem with this 
SBE reflector.


I will answer it  now.

I have used both dry air and nitrogen on large rigid lines, smaller 
M/W lines and 2 way radio lines.  Both have their place.  I have also 
very successfully cleared 12 gig elliptical lines that got "filled" 
with ice due to leaks (mainly from failed windows in the dishes with 
no radomes) where the birds picked holes in the windows.

I did this on days when the air temp was well above freezing by 
heating the nitrogen as it left the bottle (in the building) on its 
way up to the leak.  It took quite a while - sometimes a day or two 
and many bottles but the water was finally purged and the circuit 
returned to normal fade margin.  Much cheaper than riggers and new cable.

Now to answer the original question - using compressed nitrogen 
rather than compressed air means simply from chemistry 101 is that 
nitrogen is inert that is no corrosion no oxidation etc occurs.

At my plants I always used nitrogen rather than dry air when it was practical.

Larry H. Will, P.E.

Retired D.E.

NJ Public TV.


At 04:56 PM 5/6/2009, you wrote:

>preferably the hot kind, freshly exhaled...

>On May 6, 2009, at 15:50 , Dennis C. Brown wrote:

>

>>CO-2 is heavier than air.  Wouldn't that make shipping more expensive?

>>

>>Gary Blievernicht wrote:

>>>My suggestion was to use CO-2 for the ingredient in bubble packs.

>>>I've long worried that the more bubble packs the more air trapped

>>>in them the less to breathe.

>>>

>>>

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