Page 1 of 12 Second Revision No. 5-NFPA 12-2014 [ Section No. 2.3.4 ] 2.3.4 ASTM Publications. ASTM International, 100 Barr Harbor Drive, P.O. Box C 700, West Conshohocken, PA 19428-2959. ASTM A53, Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc- Coated, Welded and Seamless, 2012. ASTM A106, Standard Specification for Seamless Carbon Steel Pipe for High- Temperature Service, 2011. ASTM A120, Specification for Welded and Steel Pipe, 1996 Specification for Pipe, Steel, Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless for Ordinary Uses, 1984 (withdrawn 1987). ASTM A182, Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service, 2012. Submittal Date: Wed Mar 26 11:06:35 EDT 2014 : The standard changed name before it was withdrawn in 1987. Public Comment No. 4-NFPA 12-2013 [Section No. 2.3.4]

Page 2 of 12 Second Revision No. 13-NFPA 12-2014 [ Section No. 4.5.6.1 ] 4.5.6.1 Audible and visual carbon dioxide system alarms shall be distinct from all other alarms, including the building fire alarm system. Submitter Full Name: Barry Chase Organization: National Fire Protection Assoc Submittal Date: Tue May 13 14:56:30 EDT 2014 Insert new 4.5.6.1. Both audible and visual alarms associated with the discharge of a carbon dioxide system must be distinct from the building fire alarm and any other alarms. This is related to permission to silence audible alarms from carbon dioxide systems only after areas where the discharge has caused an unsafe concentration of CO2 have been secured against entry by unprotected persons. Public Comment No. 1-NFPA 12-2013 [Section No. 4.5.6]

Page 3 of 12 Second Revision No. 1-NFPA 12-2014 [ Section No. 4.7.1.5.1 ] 4.7.1.5.1 High-Pressure Systems. 4.7.1.5.1.1 Class 300 malleable or ductile iron fittings shall be used through 2 in. internal nominal pipe size (IPS NPS ) and forged steel fittings in all larger sizes. 4.7.1.5.1.2 Flanged joints upstream of any stop valves shall be Class 600. 4.7.1.5.1.3 Flanged joints downstream of stop valves or in systems with no stop valves shall be permitted to be Class 300. Threaded unions shall, as a minimum, be equivalent to Class 2000 forged steel. 4.7.1.5.1.4 Stainless steel fittings shall be Type 304 or 316, wrought or forged in accordance with ASTM A182, threaded or socket weld, for all sizes, 1 8 in. (3 mm) through 4 in. (100 mm). Submittal Date: Wed Mar 26 10:48:38 EDT 2014 Working pressure of 300 Pound Class ductile iron fittings is 500 psi from - 20 F through 150 F. During discharge of a high pressure CO2 system, some fittings in the system are likely to be exposed to pressures well in excess of 500 psi. Therefore the task group recommends removal of ductile iron fittings from the statement of permitted fittings for high pressure CO2 system. NPS is the standard designation used.

Page 4 of 12 Second Revision No. 2-NFPA 12-2014 [ Section No. 4.7.1.5.2 ] 4.7.1.5.2 Low-Pressure Systems. 4.7.1.5.2.1 Class 300 malleable or ductile iron fittings shall be used through 3 in. (80 mm) IPS and 1000 lb ductile iron or nominal pipe size (NPS) and forged steel fittings in all larger sizes. 4.7.1.5.2.2 Flanged joints shall be Class 300. 4.7.1.5.2.3 Stainless steel fittings shall be Type 304 or 316 for threaded connections or Type 304, 316, 304L, or 316L for welded connections, wrought or forged in accordance with ASTM A182, Class 2000, threaded or socket weld, for all sizes, 1 8 in. (3 mm) through 4 in. (100 mm). Submittal Date: Wed Mar 26 10:50:02 EDT 2014 The reference to 1000 lb ductile iron fittings is obsolete; 1000 lb DI threaded fittings are no longer standard manufacture. NPS is the standard designation used.

Page 5 of 12 Second Revision No. 3-NFPA 12-2014 [ Section No. 4.7.1.7.1 ] 4.7.1.7.1* In systems using high-pressure supply with pipe other than that specified in Sections 4.7 and 4.8 4.7.1, the thickness of the pipe shall be calculated in accordance with ASME B31.1. Submittal Date: Wed Mar 26 10:55:57 EDT 2014 : Reason Incorrect reference editorial

Page 6 of 12 Second Revision No. 7-NFPA 12-2014 [ Section No. 4.7.2.3.2 ] 4.7.2.3.2 For low-pressure systems, the pressure relief devices shall operate at a pressure no higher than 450 psi (3103 kpa). Submittal Date: Wed Mar 26 11:58:49 EDT 2014 This revision clarifies an ambiguity that the stated operating pressure is intended to be a maximum. Public Comment No. 6-NFPA 12-2013 [Section No. 4.7.2.3.2]

Page 7 of 12 Second Revision No. 4-NFPA 12-2014 [ New Section after 4.7.3.4 ] 4.7.3.5 For flanged valves, the class and style of flanges required to match the valve s flanged connection shall be used. Submittal Date: Wed Mar 26 10:57:33 EDT 2014 Different valve sizes and flange classes can use different bolt patterns.

Page 8 of 12 Second Revision No. 8-NFPA 12-2014 [ Section No. A.4.4.3.1 ] A.4.4.3.1 A sample test report is provided in Figure A.4.4.3.1. An alternative form that ensures that all the applicable design, operational, and safety requirements of this standard are documented to the satisfaction of the authority having jurisdiction can be used. Figure A.4.4.3.1 Sample Acceptance Test Report. Submittal Date: Wed Mar 26 12:12:48 EDT 2014 The added text allows the use of standard or modified forms to document the specific installed system. Public Comment No. 9-NFPA 12-2013 [Section No. A.4.4.3.1]

Page 9 of 12 Second Revision No. 9-NFPA 12-2014 [ Section No. A.4.5.3 ] A.4.5.3 Detectors installed at the maximum spacing as listed or approved for fire alarm use can result in excessive delay in agent release. For additional information on detectors, refer to NFPA 72. The FSSA Application Guide Detection & Control for Fire Suppression Systems offers the designer information on the various types of detection and control equipment. Submittal Date: Wed Mar 26 12:17:38 EDT 2014 The guide will assist the designer in understanding the types of control panels, detection and system operation. Public Comment No. 10-NFPA 12-2013 [Section No. A.4.5.3]

Page 10 of 12 Second Revision No. 12-NFPA 12-2014 [ New Section after A.4.6.6.2 ] A.4.7 The specified pipe, fittings, and components have been refined based on field experience through the development of this standard. The calculation methods for wall thickness shown in ASME B31.1, with SE values as stated in mandatory Appendix A of B31.1, are to be applied to pipe and fittings that are not specified in this standard. Submittal Date: Fri Mar 28 14:54:54 EDT 2014 Add new annex material for section 4.7. The intent of the Technical has been to use the equations from ASME B31.1 for calculation of wall thickness. This clarifies that the part of B31.1 which is to be applied to gaseous agent fire system pipe is the calculation of required wall thickness not the entire ASME Code.

Page 11 of 12 Second Revision No. 10-NFPA 12-2014 [ Section No. A.6.3.3.2 ] A.6.3.3.2 Nozzles are not required to start or stop liquid discharge simultaneously. However, The flow of carbon dioxide need not start nor stop simultaneously at all nozzles, but all nozzles must discharge liquid during a common period equal to carbon dioxide simultaneously for at least the minimum liquid discharge time. Submittal Date: Wed Mar 26 12:26:23 EDT 2014 : Editorial revisions. Public Comment No. 8-NFPA 12-2013 [Section No. A.6.3.3.2]

Page 12 of 12 Second Revision No. 11-NFPA 12-2014 [ Section No. H.1.2.6 ] H.1.2.6 FSSA Publications. Fire Suppression Systems Association, 3601 E. Joppa Road 5024-R Campbell Boulevard, Baltimore, MD 21234. Pipe Design Handbook for Use with Special Hazard Fire Suppression Systems, 2nd edition, 2011. Test Guide for Use with Special Hazard Fire Suppression Systems Containers Application Guide Detection & Control for Fire Suppression Systems, 3rd edition, January 2012 November 2010. Fire Protection Systems Inspection Form Guidelines, January 2012. Design Guide for Use with Carbon Dioxide Total Flooding Applications, 1st edition, February 2011. FSSA Design Guidelines for Carbon Dioxide Local Application Rate by Area, January 2010. FSSA Design Guidelines for Carbon Dioxide Local Application Rate by Volume, December 2005. Fire Protection Systems Inspection Form Guidelines, January 2012. Pipe Design Handbook for Use with Special Hazard Fire Suppression Systems, 2nd edition, 2011. Test Guide for Use with Special Hazard Fire Suppression Systems Containers, 3rd edition, January 2012. Submittal Date: Wed Mar 26 12:29:24 EDT 2014 : New reference. Public Comment No. 11-NFPA 12-2013 [Section No. H.1.2.6]