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  1. #14
    Join Date
    Feb 2004
    Location
    Pacific NW
    Posts
    570
    approx 4 million btu per ton of tnt

    approx 1000 btu per cu ft, so 4000 cu ft of NG per ton tnt

    about 9-1/2 cu ft of air per cu ft NG, right?

    so, 42,000 cu ft of house for a ton of TNT for NG blast (aka air-fuel bomb)

    Say big house, 8 ft ceiling, 4000 sq ft house including basement, etc = 32/42 approx 3/4 Ton of TNT equivalent.

    at 50 ft away, about 8 psi overpressure or wind speed like a Fujita F4 tornado ripping thru the neighborhood which is what the damage indicated.

    To actually plan for the level of damage seen and to acheive the stochiometric mix at ignition would imply an intelligence way above what the perps obviously are lacking .. stupidity is no defense for murder, esp when evil intended.... concur with charging sentiments of previous posters

  2. #15
    Join Date
    Jan 2007
    Location
    Mn the state where absolutey nothing is allowed
    Posts
    1,373
    Quote Originally Posted by junkhound View Post
    approx 4 million btu per ton of tnt

    approx 1000 btu per cu ft, so 4000 cu ft of NG per ton tnt

    about 9-1/2 cu ft of air per cu ft NG, right?

    so, 42,000 cu ft of house for a ton of TNT for NG blast (aka air-fuel bomb)

    Say big house, 8 ft ceiling, 4000 sq ft house including basement, etc = 32/42 approx 3/4 Ton of TNT equivalent.

    at 50 ft away, about 8 psi overpressure or wind speed like a Fujita F4 tornado ripping thru the neighborhood which is what the damage indicated.

    To actually plan for the level of damage seen and to acheive the stochiometric mix at ignition would imply an intelligence way above what the perps obviously are lacking .. stupidity is no defense for murder, esp when evil intended.... concur with charging sentiments of previous posters




    great post, i too was tring to do the math. i cant speak for tnt equivelent but having a background as a "gas guy" i seen many vidios and the results of houses purposfully blown up and the data these tests reveil.

    its harder than youd think to reach a level between LEL and UEL in a house esp one that large.

    the creeps that did this were either very smart or very lucky.....

    from the reports it sounds like the 2lb regulator was removed and bypassed and a valve in the gas fireplace missing. so gas at 2 psi through probably 1/2 or 5/8" copper for 7-8 hours to bring a 3 story 4000 sq ft house with minimal air changes to between 5-15% gas.
    before thr microwave was set to start the ignition source.

    someone did a lot of research.....

    i hope they fry.
    my boss thinks its possible to repeal the laws of physics

  3. #16
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    5,160
    Hang um high.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  4. #17
    Join Date
    Jun 2009
    Location
    Upstate SC
    Posts
    1,439
    This is local for me. possibly a gas leak at the furnace in the attic.

    http://www2.wspa.com/news/2013/jan/0...r-5277653/?v=2

    Sent from my SCH-I510 using Tapatalk 2

  5. #18
    Join Date
    Jun 2006
    Location
    SW MO.
    Posts
    5,216
    The idiots changed the digital tstat to a mechanical tstat that can generate a spark.
    Stupid. Why not just program the stat to call for heat at a certain time. The ignition of the furnace would ignite the gas filled house.

  6. #19
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Quote Originally Posted by chaard View Post
    The idiots changed the digital tstat to a mechanical tstat that can generate a spark.
    Stupid. Why not just program the stat to call for heat at a certain time. The ignition of the furnace would ignite the gas filled house.
    Because that's not what they've seen in the movies or read on the internet. Could have been a sealed combusiton furnace too. None of my gas appliances communicate wit hthe air inside the home unless, on 2 of them, you were to leave the service door off sicne the combustion air is a free draw from inside the cabinet.

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