| Re: [GMCnet] It's been asked, the cause of my GMC fire. [message #293757] |
Mon, 11 January 2016 23:52  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma:
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Senior Member |
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Ernie. The Nebraska State Fire Marshal has equipment that detects hydrocarbons. Oil. Thus an accelerant on the floor. And to him there was no reason for an accelerant to be on the floor. Thus someone put it there. And to him. I was the only one that had a reason to do that. It's called insurance money. And I had told him that there was no way it could have been there. On the 5 hour drive home. I figured it out. Basicly. He found the hydrocarbons. The case as solved right then. So he stopped his investigation. Below is the e-mail that I sent State Farm. And the Fire Marshal. He was pissed about the e-mail below. And called me to tell me that.Bob Dunahugh
There was a roof A/C unit just back of the front seat. That unit was 12,000 BTU's. That type of unit is a rotary vain compressor. An had R-22, and just under 1 pt of oil in it. All under pressure. The Oil type should have been 3GS, or 4GS . The pressure in the soldered copper tubing in this unit are. At 80 degrees, the internal pressure will be at 143PSI. At 150 degrees it will be at 381 PSI. As the temp increases. The PSI will also increase. When that unit was outside on the roof. The temp wasn't high enough to melt the solder joints. When the roof A/C unit fell from the roof into the fire. The temp at the solder joints would have allowed the soldered joints to come apart. Thus allowing the hydrocarbons in the R-22, and oil to be forced out under vary high pressure in the area of the floor. Your lab should be able to confirm this oil type from what you said. Had lots of time going home to think about hydrocarbons. And where they are. And how they got on the floor. So I figured it out for YOU.Bob Dunahugh
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