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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Offshore/Coastal Systems – Hazardous and Non-hazardous Installations Control System An external device, comprised of a PLC, controls the pressurization system and the startup of the MicroTurbine. The PLC provides a 3 minute purge timer before the start sequence begins. The PLC also monitors the pressure switch and gas detector as start permissives and shuts down the MicroTurbine(s) in the event of an alarm. Stand Alone Power Source A stand alone power source, usually a black-start capable UPS, is required to provide power to the ventilator systems on the MicroTurbine during startup and shutdown. The ventilator system draws approximately 1.5 kW for each turbine (C30 or C60) and it is operated for six minutes during startup and up to 25 minutes during shutdown. The ventilator motors are factory pre-wired for 208/220VAC 50/60 Hz operation, but can be rewired for 120VAC. The shutdown time will depend on ambient temperature and battery charge level on the MicroTurbines. The on-site UPS should be capable of supporting this load plus any other required site load. Installation All electrical conduit, switchgear, gas lines and safety valves should comply with the area classification. The installer must be aware of all applicable codes. Inlet Air and Ducting Depending on the area where the MicroTurbine will be located, a safe area for the intake will be at least at 4.6 m (15 feet) from the MicroTurbine, and at least 4.6 m (15 feet) from any other gas source. The distance from gas sources will depend on applicable local codes. The system is designed to operate appropriately with a duct of up to 10.7 m (35 feet) of equivalent length. The inlet duct assembly can run vertically, with the necessary elbow configurations to have the air inlet facing down. The inlet duct can also run horizontally, with a slope of at least five percent to prevent water accumulation. A standard drip trap may be used in the inlet duct to allow entrained condensation water to exit the duct. The duct must be secured with guy wires or attached to a frame to ensure that the installation will withstand the worst weather conditions expected in the area. It is important to provide an independent air duct when installing two or more MicroTurbines. The use of “tees” will void Class I, Div. 2 regulations. After the inlet duct installation is completed, a pressure test should be performed by powering up the ventilators, before powering the MicroTurbine to ensure that the enclosure pressure is at least 0.6 cm (0.25 inch) H2O when the MicroTurbine is not running, and always over 0.4 cm (0.15 inch) H2O when operating at full power. Capstone does not sell inlet duct components. One source for intake ducting is Bebco Industries. For more information please visit http://www.okbebco.com/. 480010-001 Rev. A (February 2005) Page 14 of 23 This information is proprietary to Capstone® Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Application Guide Offshore/Coastal Systems - Hazardous and Non-Hazardous Installation Options for the Capstone MicroTurbine
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