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| Tips, Techniques, and Questions -- Technical questions or tips |
2013-10-02, 7:14pm
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Senior Member
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Join Date: Mar 09, 2009
Location: Medford Oregon
Posts: 900
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National 8m torch heat question
I have a question concerning my National 8m surface mix torch.
It seems the fittings that conect the fuel hose gets awfully hot after about 20 min of use.
Should I be concered about the heat and any flashback issues?
Should I be using flashback arrestors because of any danger due to the heat?
Thanks
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Dawn
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2013-10-02, 11:15pm
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Junior Member
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Join Date: Apr 26, 2013
Location: Keansburg NJ
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It's always good to have flashback arresters!
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GETTING OLD STINKS
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but it"s better than not getting older
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TIM
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2013-10-03, 4:01am
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Join Date: Aug 02, 2007
Location: Nahant Ma
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I noticed my national m8 torch would do what you mentioned when I was working with silver glass and reducing. After reducing I would add clear in a neutral flame but I noticed I was not bringing the oxygen level high enough, once I added more oxygen it would cool down.
Bob
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e-mail:
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2013-10-03, 4:46am
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Join Date: Aug 17, 2011
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If your fittings are getting that hot you have the wrong oxy and propane pressure. Same thing happend to me. There is a thread about this. I can't remember the correct settings. I changed mine and it quit getting hot
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2013-10-03, 8:08am
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Join Date: Mar 09, 2009
Location: Medford Oregon
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I will go and see if I can find the thread on this. I also tried looking on national's website, but nothing.
I was thinking the flame was different, compared to my Bobcat, but thought maybe it was just a different torch. Now I am thinking it is the settings. I work on a 5 lb concentrator... hmmmm
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Dawn
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2013-10-03, 9:45am
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kinda torching....
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Join Date: Mar 26, 2013
Location: Pennsylvania
Posts: 301
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What tip are you using?
I use the sm7 with my 10lpm oxycon and I feel like its barely enough oxygen...
So unless you're using the sm5 or sm7, you're likely not getting enough oxy through the tip and causing the torch to overheat. :/
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Jeremy
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2013-10-03, 9:46am
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kinda torching....
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Join Date: Mar 26, 2013
Location: Pennsylvania
Posts: 301
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You'd probably get better heat from the bobcat unless you went to tanked oxygen, or used more or larger oxycons.
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Jeremy
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2013-10-03, 10:00am
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Senior Member
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Join Date: Mar 09, 2009
Location: Medford Oregon
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It has the sm7 tip. I will try adjusting my propane and turn up the oxy to its fullest, or get my t hose with a second concentror which I have.
I was actually liking the cooler more bushier flame on this torch. I have in route a CC also.
Thanks for everyones help! I love this forum 
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Dawn
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