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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Fuel Requirements Vapor Lock Liquid fuels with sufficiently high vapor pressures will cause vapor lock in the fuel injectors, resulting in decreased system reliability due to flame-outs, fail-to-light conditions, or unsteady MicroTurbine operation. Fuel System Evaluation Concerns The fuel system evaluation concerns include the items presented in the following paragraphs. Gaseous Fuel Temperature High or low temperature limits of the MicroTurbine raise concerns regarding liquid formation, high vapor pressure, high density, and high viscosity. High or low temperature extremes may also cause damage to the materials of construction of the fuel system component parts. Degradation of Fuel System Components, Metals, and Elastomers Fuel contaminants, additives, as well as some hydrocarbons may corrode or attack critical fuel system components. Combinations of contaminants such as water with hydrogen sulfide may lead to even more severe corrosion effects. Temperature may also accelerate the corrosive effects of some fuels. Water Condensation and Freezing in a Gaseous Fuel System The presence of condensed water or ice will result in fuel system malfunction and eventual system shut down. Liquids in a Gaseous Fuel System The presence of liquids in a gaseous fuel, either from the fuel, or from the fuel gas compressor lubricating oil, may result in fuel system malfunction. Additional risks exist if the liquids are also fuels (e.g., butane), since liquid hydrocarbons cannot be properly controlled or metered by a gaseous-fuel MicroTurbine, which can also result in over temperature/speed events, unreliable MicroTurbine operation, and engine damage. Fuel Gas Booster (Gas Compressor) Life Excessive gaseous fuel temperatures or corrosive contaminants will cause early component failure. Sub-atmospheric inlet pressure to the fuel gas booster can also result in air leaking into the gas fuel supply and the consequent risk of an explosive mixture. Sub-atmospheric or excessive inlet pressures will result in reduced fuel gas booster life. Additionally, the use of saturated or near saturated fuels may result in the formation of condensate within the fuel gas booster, which in turn, may lead to early component failure. 410002 Rev G (October 2009) Page 16 of 18 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Capstone MicroTurbine Fuel Requirements
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