47.5 MB - The Whole Building Design Guide

Electrical systems and components: Electrical systems and components,and electrical controls of heating, ventilation, and airconditioning systems, are subject to damage simply by getting wet,even for short durations. Unless specifically designed for wet locations,switches and other electrical components can short out dueto deposits of sediment, or otherwise not function even when allowedto dry before operation. Wiring and components that havebeen submerged may be functional, although generally it is morecost-effective to discard flooded outlets, switches, and other lessexpensive components than to attempt thorough cleaning.Communications infrastructure: Critical communications infrastructure,such as control panels and wiring for warning systems, 911systems, and regular telephone and wireless networks, are mostsusceptible to failure during emergencies if located in below-gradebasements.Specialized piping: Unprotected piping for medical gas supplysystems may be damaged and threaten care that depends on uninterruptedsupply of oxygen and other gasses for the treatment ofpatients.Ductwork damage: Ductwork is subject to two flood-related problems.Flood forces can displace ductwork, and saturated insulationcan overload support straps, causing failure.Mold and dust: Furnaces, air handlers, and ductwork that have beensubmerged must be thoroughly cleaned and sanitized. Otherwise,damp conditions contribute to the growth of mold and accumulatedsediment can be circulated throughout the critical facility,causing respiratory problems. Fiberglass batt or cellulose insulationthat has been submerged cannot be sanitized and must bereplaced. In sensitive environments, ductwork should be replacedrather than cleaned.Gas-fired systems: Water-borne sediment can impair safe functioningof jets and controls in gas-fired furnaces and water heaters,necessitating professional cleaning and inspection prior to restorationof service. Control equipment (valves, electrical switches,relays, temperature sensors, circuit breakers, and fuses) that havebeen submerged may pose an explosion and fire hazard andshould be replaced.2-50 MAKING CRITICAL FACILITIES SAFE FROM Flooding