3-3-106

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University of the People *

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2020

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Mechanical Engineering

Date

Nov 24, 2024

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pdf

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Uploaded by engminamaged1991

SERVICE BULLETIN NOTICE: The Type of Change and Recommended Compliance specified reflects Solar’s best judgment regarding the Service Bulletin. All questions should be directed to your Solar Field Service Representative. Solar, Saturn, Centaur, Taurus, Mercury, Mars, Titan, SoLoNOx, and Turbotronic are trademarks of Solar Turbines Incorporated. Cat and Caterpillar are trademarks of Caterpillar Inc. Specifications subject to change without notice. NUMBER: 3.3/106 ISSUED: June 1999 REVISED: PRODUCT: Mars 90, Mars 100 MODEL(S): All Specifics: Mars Standard Combustion “Dual Fuel” Applications SUBJECT: FUEL MIGRATION Type of Change: Product Improvement Recommended Compliance: Earliest Convenience Purpose: The purpose of this Service Bulletin is to announce the availability of a retrofit kit to correct the fuel migration problem of the dual fuel Mars engines. GENERAL INFORMATION: Mars dual fuel units with standard combustion system in the field have been experiencing problems associated with migration of liquid fuel into the gas fuel manifold during the operation on liquid fuel. The liquid fuel, which migrates into the gas fuel manifold cokes up the injectors and can cause problems with subsequent gas fuel operation. Some of the injector fuel lines were found to have excessively elevated temperatures at the sites with the fuel migration problem, which is caused by recirculation of combustor air between injectors with slightly different pressure levels (cross flow). A PCD forward purge system has been developed for the Mars dual fuel standard engines. This system prevents the entrapment of liquid fuel into the gas passageways of the dual fuel injectors and the resulting plugging of these gas passageways with coke and carbon. A positive flow of PCD air through the gas fuel manifold and the gas passageways of the injectors prevents the entrance of liquid fuel into the gas passageways. This positive flow of PCD is achieved by the use of a connecting line between PCD and the gas fuel manifold through two automated shutoff valves. The SERVICE BULLETIN Page 1 of 2 NUMBER: 3.3/106

pressure drop across the combustor liner provides the pressure differential to achieve the airflow. Without this purging air flow, the liquid fuel can be entrapped in the gas passageways by “cross flow” due to the small pressure differences around the combustor. ACTION REQUIRED: Gas fuel purge kits have been developed for field installation on the dual fuel packages to correct the problem. Contact your local Solar Field Service office for assistance in ordering the appropriate Retrofit Kit and to schedule its installation. The kit will be provided free of charge. KIT PART NO. APPLICATION 1036817-100 NEC CERTIFICATION 1036817-200 CENELEC CERTIFICATION Page 2 of 2 SERVICE BULLETIN NUMBER: 3.3/106

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