3-3-106
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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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