Path: utzoo!attcan!uunet!wuarchive!texbell!vector!telecom-gateway
From: mhw@wittsend.lbp.harris.com (Michael H. Warfield (Mike))
Newsgroups: comp.dcom.telecom
Subject: Re: Tanks near Telephone Poles
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Date: 12 Aug 89 03:45:27 GMT
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X-TELECOM-Digest: volume 9, issue 291, message 8 of 9

In article  claris!apple!netcom!
onymouse@ames.arc.nasa.gov (John DeBert) writes:

>in article , I said:

>> A yellow cylinder contains compressed air and one that is silver with green
>> at the top is nitrogen gas.  Once or twice, I have seen helium cylinders
>> (silver with orange) in place, perhaps because nothing else was available(?)

>I wasn't sure if nitrogen cylinders also used green as green usually
>marks oxygen cylinders. Yesterday, while at work, I checked. nitrogen
>cylinders have beige paint on them, not green.

	While there are certain standards for tank markings, outside
of some well establish colors there seems to be some variation when
it comes to less dangerous or critical gasses.

	From my days in the broadcast industry I believe the dry nitrogen
we used to pressurize our lines came in silver tanks with an orange top.  Most
of the time that is.  There were exceptions (some solid silver tanks and
I think I remember a shipment with blue tops).  However, I do believe that
SOLID green is reserved for MEDICAL oxygen while oxygen for welding is
in solid orange cylinders.  I have also seen tanks which had a colored
band while the tops and bottoms were the same color (generally silver for
those).  I would seriously doubt anyone would pressurize a line with helium.
The cost would be prohibitive and helium would bleed out of the line over
time (helium is notorious for bleeding right through metal).  Best source
of finding out what's what would be to check in an AIRCO (welding gas
supplier) catalog (used to have one around this joint somewhere :->) or
another local welding supplier.

---
Michael H. Warfield  (The Mad Wizard)	| gatech.edu!galbp!wittsend!mhw
  (404)  270-2123 / 270-2098		| mhw@wittsend.LBP.HARRIS.COM
An optimist believes we live in the best of all possible worlds.
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