Home Page link

Low Nitrogen flow while brazing - How to regulate?

Home| Search | About
Login Password
Register Now! Lost Password?

HVAC Discussions - Heating, ventilation and air conditioning. 

Bookmark this page:  YahooMyWeb Yahoo!  Google Google  Windows Live Favorites Windows Live  del.icio.us del.icio.us  digg digg  Add to Netscape Netscape
Subject Author Date
Low Nitrogen flow while brazing - How to regulate? pv=nrt 01-05-2007
If you were  Registered and logged in, you could reply and use other advanced thread options
Posted by pv=nrt on January 5, 2007, 7:37 pm
My Linde Nitrogen purging regulator doesn't regulate pressure to well
below about 25 PSI. Other then buying a low flow setup how do you all
keep a very low Nitrogen purge flowing while brazing linesets.

If you dry fit all the lineset connections and give it a good Nitrogen
purge and then shut off the flow will the residual Nitrogen keep the
Oxygen from invading. Nitrogen is only one notch lighter then Oxygen
so I don't think it's going to get too anxious to escape.





Posted by on January 5, 2007, 10:18 pm
pv=nrt wrote:

>My Linde Nitrogen purging regulator doesn't regulate pressure to well
>below about 25 PSI. Other then buying a low flow setup how do you all
>keep a very low Nitrogen purge flowing while brazing linesets.
>
>If you dry fit all the lineset connections and give it a good Nitrogen
>purge and then shut off the flow will the residual Nitrogen keep the
>Oxygen from invading. Nitrogen is only one notch lighter then Oxygen
>so I don't think it's going to get too anxious to escape.
>
>
>
>

when you fit up the copper, wrap each joint with one wrap of
electrical tape, being careful not to get the tape hot enuf to melt if
welding nearby. peel the tape before welding the joint

then crank the nitro reg down to its lowest point possible and still
get a flow. if i need finer control, i'll run it thru the low side on
my guage set and then crank it down to 1 psi or less.

Posted by James Storm on January 6, 2007, 6:12 pm
pv=nrt wrote:
> My Linde Nitrogen purging regulator doesn't regulate pressure to well
> below about 25 PSI. Other then buying a low flow setup how do you all
> keep a very low Nitrogen purge flowing while brazing linesets.
>
> If you dry fit all the lineset connections and give it a good Nitrogen
> purge and then shut off the flow will the residual Nitrogen keep the
> Oxygen from invading. Nitrogen is only one notch lighter then Oxygen
> so I don't think it's going to get too anxious to escape.
>
>
>
>
I have a restrictor device used for charging liquid refrigerant into
systems. I use it also to slow down the flow of nitro. through pipes.
The regulator can be set up to a higher pressure to keep the flow going
and the restrictor keeps the flow down.
Stormy Weather

Posted by Geoman on January 6, 2007, 7:29 pm

> My Linde Nitrogen purging regulator doesn't regulate pressure to well
> below about 25 PSI. Other then buying a low flow setup how do you all
> keep a very low Nitrogen purge flowing while brazing linesets.
>
> If you dry fit all the lineset connections and give it a good Nitrogen
> purge and then shut off the flow will the residual Nitrogen keep the
> Oxygen from invading. Nitrogen is only one notch lighter then Oxygen
> so I don't think it's going to get too anxious to escape.


I replaced our Airco regulator for a new Goss, WHAT A MISTAKE! The Goss is
a real POS.

I will never buy another Goss for anything since this last regulator.

Rich



Posted by Barry on January 7, 2007, 10:36 pm

>My Linde Nitrogen purging regulator doesn't regulate pressure to well
>below about 25 PSI. Other then buying a low flow setup how do you all
>keep a very low Nitrogen purge flowing while brazing linesets.
>
>If you dry fit all the lineset connections and give it a good Nitrogen
>purge and then shut off the flow will the residual Nitrogen keep the
>Oxygen from invading. Nitrogen is only one notch lighter then Oxygen
>so I don't think it's going to get too anxious to escape.
>
>
>OK here ya go !!! Get a piece of cap tube 12 to 18 inches in length, braze a
small piece of quarter inch copper onto one end. Next, put a quarter inch flare
nut on the end, use a flare union and your refrigeration gauge set, hook your
gauge set to your nitrogen regulator and there you go with you .5 to 1 PSI
nitrogen flow.


Barry
>


Similar ThreadsPosted
Brazing rod is HOT right now.... February 20, 2007, 8:38 pm
silfos brazing advice October 17, 2006, 5:28 pm
purging lines while brazing? June 17, 2007, 7:41 pm
I'd like to improve my copper brazing technique. (refrigerant lines) February 5, 2007, 11:05 am
Flow / Pressure Question January 5, 2008, 6:24 pm
Re: Bi-Flow Clean-up Filter Driers in Inverter Splits February 29, 2008, 7:55 am
Re: Bi-Flow Clean-up Filter Driers in Inverter Splits March 1, 2008, 3:51 pm
Re: Bi-Flow Clean-up Filter Driers in Inverter Splits March 1, 2008, 6:12 pm
Re: Bi-Flow Gas-Line Filter Driers & Inverter Mini-Splits March 13, 2008, 2:45 am
Burner air intake adjustment and flame color, flame length and combustion flow October 31, 2007, 1:51 am

Contact Us | Privacy Policy

XML SitemapXML Sitemap