Myth busters would love you. (They have shown what a high pressure tank
accident can look like and not look like.)

Safety requirements for high pressure tanks are much more stringent than for
dewars. For a short while I was using high pressure tanks (oxygen) and then
switched over to dewars. Made the fire marshall much happier.
Dewars hold much more usable gas than common high pressure tanks.
When not using gas, the dewars will vent some (because of over-pressure) and
keep themselves cool allowing the rest of the gas to remain in liquid form.
Sometimes, when venting the over-pressure valve freezes in the open position
and slowly all your gas disappears. It takes a little tap with any tool to
overcome that problem.
 
Have fun,
Ahne.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: 25 February, 2014 05:04
To: [log in to unmask]
Subject: Re: [TN] Nitrogen question

You have several options. Three I can think of are:

1. Purchase your nitrogen in smaller tanks (they come in about a 100 lb
tank, I think). The drawback to this is safety violations in handling the
tanks. While nitrogen is inert, pressurized nitrogen tanks are strictly
controlled by the local OSHA gentlemen. They must be handled with a special
dolly made just for tanks, strapped to the wall securely, etc. I once saw a
forklift driver break off the shutoff valve on a tank that was loosely
chained to a cement block wall. The force of the escaping gas drove the tank
downward at a slight angle, allowing it to blast out from under the chain,
and it then blew through the ceiling on the other side of the factory,
accelerated through the air about 2 blocks, and came back down inside
another cement-block building and blew through the concrete floor of that
building. When it hit the other building, they say it went off like a bomb.

2. Purchase a nitrogen generator. They don't take up too much space, but
being able to produce your own nitrogen is a big cost savings after the
initial investment. 

3. Set up a nitrogen storage facility onsite (typically outside the
manufacturing plant). While this is a much more costly option up front, it
may be the best option if you are using larger volumes of nitrogen.

Not sure about the purity level.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Keith Calhoun
Sent: Tuesday, February 25, 2014 6:33 AM
To: [log in to unmask]
Subject: [TN] Nitrogen question

We are looking into installing a selective soldering machine in our
facility.  The machine we are looking into wants a nitrogen supply to inert
the solder pot.
My question to the forum is what source are you using for their nitrogen
requirements?  Also what purity level are you using?
 
 
Keith S. Calhoun
Manufacturing Engineering Manager
Sopark Corporation
3300 South Park Avenue
Lackawanna, New York 14218
716-822-0434 Ext. 237
[log in to unmask]
 
SoPark Corporation
Talent - Teamwork - Technology
Over 32 years as a Premier Electronics Manufacturing Service Provider ISO
9001:2008, ISO 13485:2003 & AS9100C Certified 
 

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