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3102.8 Inflation Systems
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The inflation system shall consist of one or more blowers and shall include provisions for automatic control to maintain the required inflation pressures. The system shall be so designed as to prevent overpressurization of the system.
In addition to the primary inflation system, in buildings larger than 1,500 square feet (140 m2) in area, an auxiliary inflation system shall be provided with sufficient capacity to maintain the inflation of the structure in case of primary system failure. The auxiliary inflation system shall operate automatically when there is a loss of internal pressure and when the primary blower system becomes inoperative.
Blower equipment shall meet all of the following requirements:
- Blowers shall be powered by continuous-rated motors at the maximum power required for any flow condition as required by the structural design.
- Blowers shall be provided with inlet screens, belt guards and other protective devices as required by the building official to provide protection from injury.
- Blowers shall be housed within a weather-protecting structure.
- Blowers shall be equipped with backdraft check dampers to minimize air loss when inoperative.
- Blower inlets shall be located to provide protection from air contamination. The location of inlets shall be approved.
Wherever an auxiliary inflation system is required, an approved standby power-generating system shall be provided. The system shall be equipped with a suitable means for automatically starting the generator set upon failure of the normal electrical service and for automatic transfer and operation of all of the required electrical functions at full power within 60 seconds of such service failure. Standby power shall be capable of operating independently for not less than 4 hours.
A system capable of supporting the membrane in the event of deflation shall be provided for in air-supported and air-inflated structures having an occupant load of 50 or more or where covering a swimming pool regardless of occupant load. The support system shall be capable of maintaining membrane structures used as a roof for Type I construction not less than 20 feet (6096 mm) above floor or seating areas. The support system shall be capable of maintaining other membranes not less than 7 feet (2134 mm) above the floor, seating area or surface of the water.
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Building Code 2018 of Illinois > 27 Electrical > 2702 Emergency and Standby Power Systems > 2702.2 Where Required
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