NFPA 99, 2012 edition and most other editions have an “existing systems clause” helps to clarify that the requirements of the specific edition of the code are not meant to apply to existing systems.
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I would like to clarify the NFPA 99 requirements for zone valve box locations and an intervening wall between the zone valve and patient outlets per NFPA 99 (2015 Edition) 5.1.4.6.1 (1).
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NFPA 99 requires testing to be performed anytime a medical gas system is “breeched.” The code has a broad definition of what it means to breech a medical gas or vacuum system. The code deems a breach of the system as anytime that there is a pipeline intrusion by physical separation OR when a system component is removed, replaced, or added.
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NFPA 99 2018 5.1.3.6.1 (2) indicates that medical air shall meet the requirements of medical air USP. However, Table 5.1.12.4.12.3 does not include nitric oxide and sulfur dioxide as contaminates to be tested for even though they are listed in the USP as contaminates. Can you please help clarify why these are not required to be tested for in NFPA 99?
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In the 2015 and 2012 edition of NFPA 99, 5.1.4.5.3 says, “Service valves shall be placed in the branch piping prior to any zone valve box assembly on that branch.” Does that mean that on each pipe, to each zone valve box, there shall be a valve that will allow the zone valve to be isolated?
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