In NFPA 99 18.104.22.168.3 An annual reveiw of bulk systems capacity shall be conducted, what process do you use for documenting this was done for hospitals?
The American Society of Plumbing Engineers Data Book Volume 3: Special Plumbing Systems, Chapter 2: “Medical Gas and Vacuum Systems.” should be used as a method to review the total demand for medical-gas systems.
Excerpt from the ASPE book and https://www.aspe.org/sites/default/files/webfm/ArchivedIssues/2006/20060102/ContinuingEdMedGasVac.pdf
Two methods can be used by the plumbing engineer to estimate the consumption of oxygen. The more accurate method is to obtain a detailed consumption record from the health-care facility or obtain monthly oxygen shipment invoices from the supplier. If inventory records are not available from the health-care facility or the supplier, use consumption records from a comparably sized facility, with good judgment.
The second method is to apply the following rule of thumb to estimate the monthly supply of oxygen. This estimating method should be used with good judgment. Always coordinate estimated demand with the oxygen supplier during the design process.1. In non-acute-care areas, allow 500 ft3 (14 m3) per bed per month for supply and reserve oxygen storage.2. In acute-care areas, allow 1000 ft3 (28 m3) per bed per month for supply and reserve oxygen storage.
Oxygen supply sources are divided into two categories:(1) bulk oxygen systems and (2) cylinder-manifold-supply systems. Bulk oxygen systems should be considered for health-care facilities with an estimated monthly demand above 35,000 ft3 (991 m3) or equal to 70 oxygen outlets. Manifold systems are used in small general hospitals or clinics.
Excerpt from 2012 NFPA 99:
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