Consulting-Specifying Engineer - November 2007 - (Page 17)

to provide smoke removal capabilities upon activation of a water flow alarm. ALLEN: Smoke control systems often are integrated with the building automation system rather than designed as standalone systems. Where this is the case, it is important that the smoke control components meet the code requirements. For example, the IBC (International Building Code) Section 909.12 requires that control units providing input or output signals to mechanical smoke control systems comply with UL 864. Section 909.13 provides requirements for control air tubing. The designer must properly specify the equipment because normal BAS systems may not meet these requirements. In warehouses where ESFR sprinklers are used, natural and powered roof ventilation may delay sprinkler operation if the vent captures the fire plume or if air velocity at a sprinkler is too high. Although not referenced by NFPA 13, FM Global Data Sheet 2-2, Installation Rules for Suppression Mode Automatic Sprinklers, indicates that the air velocity at sprinklers should not exceed 5 fps. As previously discussed, the design and installation of ESFR sprinklers requires consideration of many building features, including normal ventilation and smokeand-heat venting, that are not a factor with standard sprinklers. CSE : Are there any recent code changes that you know of regarding fire protection for high-bay areas? GOLDHAMMER: NFPA 13 2007 edition has added further clarification regarding ceiling heights and clearances. In addition, design criteria using various k-factors, operating pressures, and storage and ceiling heights have been added based on the use of full-scale fire testing. ALLEN: NFPA 13 continues to reflect new design information for sprinkler protection of storages based on testing and listing of newly development sprinklers. For smoke control systems in atriums, the IBC requirements have changed in the 2000, 2003 and 2006 editions. The 2006 edition eliminated the prescriptive requirements of previous editions, referencing NFPA 92B, which allows an overall review of smoke layer movement. Computer modeling provides a more realistic understanding of smoke movement, especially in spaces with unusual configurations. Coupled with egress modeling, a performance design can demonstrate safety to occupants for the time needed for egress with cost-effective smoke control designs. VFD-Induced Shaft Current Kills Motor Bearings! BEARING PROTECTION RING Guaranteed to Protect Bearings for Life! For motors up to 100 HP / 75 kw, AEGIS SGR’s patented technology is guaranteed to protect bearings against electrical fluting damage for the life of your motor. The AEGIS Bearing Protection Ring™ extends motor life and increases system reliability. To download a free technical paper on bearing protection technologies, visit our website: 1-866-738-1857 | sales@est-aegis.com | www.est-aegis.com/cse1 Input #211 at csemag m/quickResponse Consulting-Specifying Engineer • NOVEMBER 2007 17 http://www.est-aegis.com/cse1 http://www.est-aegis.com/cse1 http://csemag.com/quickResponse

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - November 2007

Consulting-Specifying Engineer Contents Editor's Viewpoint Letters In The News M/E Roundtable Emergency Power for Healthcare 2007 Products of the Year Industrial-strength Lighting Hazardous HVAC Codes and Standards Management Report Jobs/Classifieds Specifier's Notebook On-Peak Performance Contents Best Battery Selector in Engine Starting Applications NEC 708: Practical Impact on Backup Power Systems Protecting Power: Specifying Outdoor Generator Enclosures Investing in Backup Power Systems Coes, Consultants, Manufacturers, and Standby Power Systems

Consulting-Specifying Engineer - November 2007

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