Medical Gas Professional Healthcare Organization

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Zone Valve location.

  • Friday, January 05, 2018 1:33 PM
    Message # 5663786

    I see nothing in NFPA 99, 2012 edition to limit a project from performing the following. 

    Please review and let me know if I have missed something here. I look forward to your opinions.

    A facility has issued plans and specifications to install new outlets in a room that is located in an older building of the hospital. The zone valve that exists is across a main hall in the newer building that the hospital wants the contractor to install these new outlets (with vibration isolators installed between the outlets and zone valve at the buildings interface) located in the older building. The new outlets are located in the same story as the existing zone valve. The existing patient care area served is not a critical care area and the new room with the outlets is a CT Scan Room. (Possible ventilator patients since this is a Trauma Center). There is an area alarm panel in the existing patient care area served by the existing zone valve location.

    Currently the AHJ recognizes 2012 edition of NFPA 99 and I find nothing within addressing this specific scenario.

    I see the code IMPLIES there is a need for the building main valve in when the medical gas pipes enter the building. I do not know if this is of any significance.

    The project requires the vibration isolators at the building interface.

  • Friday, January 05, 2018 1:52 PM
    Reply # 5663866 on 5663786
    Al Moon (Administrator)

    I see this all the time  ( short of the seismic items ).

    NOTE: If you believe Main Line Valve is required.

    Then a EOSC would be required.

  • Saturday, January 06, 2018 7:34 AM
    Reply # 5664657 on 5663786

    Is there a two hour separation between the two buildings?

  • Tuesday, January 16, 2018 4:51 PM
    Reply # 5686426 on 5663786
    Corky Bishop (Administrator)

    If these buildings are physically attached to each other, than neither a main valve nor an EOSC would be required.  A much overlooked word in the EOSC section is Freestanding.


    It would not be good practice to build an addition to the facility that arbitrarily includes a check valve in the Oxygen mains.  An EOSC for the new addition would only serve the new building, since the check valve would not allow it to flow to the original building. 


    (2) Multiple freestanding buildings are served from a single oxygen source such that damage to the interconnecting oxygen line could result in one or more buildings losing oxygen supply, in which case each building is required to be provided with a separate emergency connection.


     This is describing separate underground lines to unattached buildings.

    Last modified: Tuesday, January 16, 2018 4:53 PM | Corky Bishop (Administrator)
  • Wednesday, January 17, 2018 4:12 PM
    Reply # 5688391 on 5663786

    Thank you for your observations. I didn't even think of the EOSC location and the "freestanding" verbiage is one I overlooked.

    How about the vibration isolator flex connector on the patient side of the zone valve? Wouldn't a zone valve required for the room in the separate building?

    Or, am I connecting code "dots" that do not exist at this moment in time?

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