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Fuel gas catalytic heater inside the building

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    Fuel gas catalytic heater inside the building

    Hello,

    I have a project where a fuel gas (pipeline gas) catalytic heater will be installed in the Control Building to heat the room. We do not have enough power available for an electric heater so this seams to be the only solution right now. This room houses AGM batteries, battery chargers, AC & DC panelboards and a PLC cabinet. We have designed this Building as Unclassified but will adding this catalytic heater inside the building going to change the area classification to Class 1 Div 2 instead of Unclassified?

    Thank you!

    #2
    Originally posted by voicam01 View Post
    Hello,

    I have a project where a fuel gas (pipeline gas) catalytic heater will be installed in the Control Building to heat the room. We do not have enough power available for an electric heater so this seams to be the only solution right now. This room houses AGM batteries, battery chargers, AC & DC panelboards and a PLC cabinet. We have designed this Building as Unclassified but will adding this catalytic heater inside the building going to change the area classification to Class 1 Div 2 instead of Unclassified?

    Thank you!
    Possibly. The heater itself may actually mitigate the classification, but the piping to the heater may also affect the classification. In fact, it might require a Division 1 classification. Hard to tell without the full geometry and process description of the installation.
    "Bob"
    Robert B. Alexander, P.E.
    Answers based on 2017 NEC unless otherwise noted.

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      #3
      Generally speaking not a classified location. Pipelines, vessels that normally contain the gas do not normally create a classified location. Fuel burning appliances normally don't either, such appliances usually have controls that sense a flame, and have purge cycles and a lock out function if flame isn't detected when it should be. A leak outside of monitored controls is not a normal function and doesn't usually lead into making this a classified location. There may be a classified location near any pressure relief vent outlets or similar though.
      I live for today, I'm just a day behind.

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