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  • Wednesday, May 20, 2020 6:55 PM
    Message # 8983121
    Al Moon (Administrator)

    This is from NFPA 99 2018 / But also is in 2015 & 2012:

    The manifolds in this category shall include an automatic means of alternating the two headers to accomplish the following in normal operation:
    (1) One header is the primary and the other is the secondary, with either being capable of either role.
    (2) When the primary header is supplying the system, the secondary header is prevented from supplying the system.

    (3) When the primary header is depleted, the secondary
    header automatically begins to supply the system.

    ? Does this mean, that the manifold shall automatically switch back after the  cylinder exchange or can the manifold be switched back by seim automatic means ? ( i.e. by handle or knob )

  • Thursday, May 21, 2020 7:23 AM
    Reply # 8984028 on 8983121


    I think you will find it in earlier versions too.

    Yes, semi auto manifolds have always been permitted, just as "manual alternation" is permitted in air and vacuum controls.

    NFPA's philosophy is that if it can do the job needed for safe operation, it must be allowed - even though many of us would never use a semi auto manifold in medical service.

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