1、 Errata NFPA 909 Code for the Projection of Cultural Resource Properties Museum, Libraries, and Places of Worship2017 Edition Reference: 12.2.3*, Equations D.4.3a and D.4.3b, and Table G.1(a) Errata No: 909-17-1 The Technical Committee on Cultural Resources notes the following error in the 2017 edit
2、ion of NFPA 909, Code for the Projection of Cultural Resource Properties Museum, Libraries, and Places of Worship. 1. Update the table reference in 12.2.3* to read as follows: 12.2.3* Inspection. Inspection and testing frequencies, responsibilities, test routines, and reporting procedures shall comp
3、ly with the applicable code or standard from Table 9.12.14, NFPA 25, and NFPA 72. 2. Replace the numeral “1” with italics lower case “l” in Equations for D.4.3a and D.4.3b to be consistent with the “where” list to read as follows: D.43a where: ff = far focus limit (in mm) h = hyperfocal distance (in
4、 mm) d = lens focus distance (in mm) l = lens focal length D.43b where: nf = near focus limit (in mm) h = hyperfocal distance (in mm) d = lens focus distance (in mm) l = lens focal length 3. In Annex G, replace “L/min/(bar)”, in the last column heading, with the correct units for K factor per NFPA 1
5、3, “L/min/(bar)” (the “1/2” must be superscript), and wherever else it occurs. Table G.1(a) Sprinkler Specifications Sprinkler Activation Mechanism Temperature . Rating (C) Orifice (mm) K-factor . L/min/(bar)1/2 On/off pendent Fusible alloy 60 12.5 80 Bimetallic disk 74 QR pendent Glass bulb 68 12.5
6、 80 QR horizontal sidewall Glass bulb 68 12.5 80 Issue Date: January 11, 2017 (Note: Electronic products and pamphlet reprints may have this errata incorporated. For current information about the NFPA Codes and Standards, including this errata, please see www.nfpa.org/docinfo) Copyright 2017 All Rights Reserved NATIONAL FIRE PROTECTION ASSOCIATION
