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2013-05-11, 9:53am
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Senior Member
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Join Date: Jun 25, 2009
Location: Southeast MI
Posts: 570
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Failed firecheck?
Does anyone know how to tell if you've had a flashback into a firecheck?
Reason I ask if this. I haven't torched in about 9 months and just tried to light my nortel minor. I let my oxycon run about 10 min, shut that off and opened my NG. Tried to light the torch and nothin happened. I can feel the O2 coming thru the torch fine when it's just the oxy con running. I'm wondering if my firecheck was bad would that prevent me from lighting the torch? I really don't know where to start trouble shooting this so any help is welcome. Could my hoses be gunked up? I thought NG was a cleaner fuel though I've had the same hoses for around 4-5 years. I bought my torch used too. Don't know how old it was when I bought it in the GS.
Maybe the torch needs cleaning? It didn't come with any of the wires since it was used.
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Kat
My Ebay
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2013-05-11, 4:36pm
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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A true fire check for NG or very low pressure propane has no moving parts to fail... All it is is a very fine filter/screen type material that is so small a material the gas molecules can pass thorough but they are to small for a flame front to pass through.... IT could be gummed up if there were oils of some type dropping out of suspension is the "gas" and have gummed it up but it is not very likely...
Is there a master shut off valve before fire check (should be) and did you turn it on?
IF you can open gas valve on torch (no oxygen) and get a flame on face of torch, then fire check is not the problem....
Dale
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2013-05-11, 4:46pm
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Senior Member
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Join Date: Jun 25, 2009
Location: Southeast MI
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Thanks Dale. Yes I have two shut offs prior to the fire check. Both were open. After the fc, hoses go to my torch shut off valve. I attempted to get the torch lit with the oxy con shut off at my torch, but couldn't get the torch to light which has never happened before. I've never had an incident where I thought I had a flashback, and like I said, all my equipment was used. Just wondered if my fc had a flashback if the membrane could have melted and obstructed the gas flow. So either's it's the torch itself, the hoses or my fire check. I'll have to get some cleaning wires and start working my way back from the torch. Thanks for the help.
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Kat
My Ebay
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2013-05-11, 6:24pm
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sorcerer
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Join Date: Nov 13, 2005
Location: kangaroo island
Posts: 312
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How long are the hoses from the NG supply to the torch? you perhaps have not given the gas time to purge the lines.
B
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2013-05-12, 7:23am
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Senior Member
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10-12 feet from supply.
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Kat
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2013-05-16, 7:05am
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PyronamixK
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Join Date: Jun 24, 2005
Location: Spatula City
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How long are you waiting before shutting it off? Like B said, it could be that it is taking a little while to purge the line of air and fill with fuel gas.
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Kimberly
working glass since 1990 - melting it on a torch since 2002
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2013-05-17, 5:57am
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
Posts: 5,200
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Try removing fire check out of line for a quick test....
Dale
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