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steam system not hearing radiators

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Have steam boiler that was converted from oil to natural gas, it hasn't been ran in 4 years. Steam worked fine before stopped using it. Did conversion and it seems as if steam isn't making it to radiators, if I pull vent out it will push out after about 45 minutes, at almost no pressure. Changed all vents on radiators and 2 main vents in basement. Any suggestions greatly appreciated.

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  • Steamhead
    Steamhead Member Posts: 16,888
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    Is the firing rate correct?

    Did they clean the boiler thoroughly before installing the new conversion burner?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • morris31607
    morris31607 Member Posts: 6
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    Yes it was cleaned and we are running at 150000btus before oil was at 140 It doesn't seem to be building any pressure closed all valves and tried to get ptrol to kick system ran for about an hour and wouldn't shut down.
  • morris31607
    morris31607 Member Posts: 6
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    Also it will run until tstat temp is reached, should it sit off on pressure before tstat?
  • Steamhead
    Steamhead Member Posts: 16,888
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    What were the combustion test results on the gas burner? What make and model are the burner and the boiler?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • morris31607
    morris31607 Member Posts: 6
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    Not sure on comb test boiler is peerless ec03 will have to get Burnet type later when out of work
  • BobC
    BobC Member Posts: 5,479
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    Clock the gas meter to check how much gas it is using, this tells you how to do that.

    http://www.aprsupply.com/support/technical-support/checking-firing-rate-(clocking-meter)

    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • morris31607
    morris31607 Member Posts: 6
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    Thanks will check this and let u know in morning