Combustion Chamber
Figure 001
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COMBUSTION CASE ASSEMBLY - DESCRIPTION AND OPERATION
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1. General
_______ (Ref. Fig. 001) The combustion case is a fabricated structural weldment located between the high pressure compressor (HPC) and the low pressure turbine (LPT). It provides the structural interface, transmits the engine axial load, and provides gas flow path between the compressor and LPT. The case incorporates the compressor outlet guide vanes (OGV) and a diffuser for the reduction of combustion chamber sensitivity to the compressor air velocity profile.
2. Description
___________ R
R A. Components R The combustion case encloses the combustion chamber and high pressure R turbine (HPT) components. The combustion chamber, compressor rear R stationary (CDP) seal, HPT nozzle assembly, and HPT shroud/stage 1 LPT R nozzle assembly are mounted in and structurally supported by the R combustion case. The case mounts and positions the 20 fuel nozzles, 2 R igniters, and fuel manifold. R The fuel manifold system is composed of a fuel supply manifold (Y tube), R 2 fuel manifolds halves, 3-piece drain manifold, and overboard drain R tube.
B. Ports There are 6 borescope ports ; 4 for inspection of the combustion chamber and HPT nozzles and 2 for inspection of the HPT blades and shrouds and the stage 1 LPT blades. The case has 4 ports for extraction of compressor discharge air for customer use, 4 ports for introduction of stage 5 compressor air for low pressure cooling and 3 ports for HPT shroud cooling air (one for source air and 2 for introduction of air to the shrouds). There is also one port for the following : start bleed dump, P3 sensor, T3 sensor, and CCCP air. There are 2 ports for the spark igniters and 2 ports for turbine clearance control thermocouples.
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Combustion Case
Figure 001
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COMBUSTION CASE ASSEMBLY - INSPECTION/CHECK
___________________________________________ TASK 72-41-00-290-001 R Borescope Inspection of the Combustion Chamber Liners, Dome Areas,HPT Nozzle R Vanes and Shrouds
1. Reason for the Job
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Refer to the MPD TASK: 724000-C1
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
72-42-00-290-041 Borescope Inspection of the Combustion Chamber Liners and Dome Area 72-51-00-290-004 Borescope Inspection of High-Pressure Turbine Nozzle Assembly 72-53-00-290-004 Borescope/Inspection of the High-Pressure Turbine Shroud
3. Job Set-up
__________
Subtask 72-41-00-869-051
A. Not Applicable
4. Procedure
_________
Subtask 72-41-00-290-051
A. Do a borescope inspection:
(1) Borescope inspect combustion chamber liners and dome areas (Ref. TASK 72-42-00-290-041).
R NOTE : Combustion chamber port access is required through as many
____ R ports as necessary to assure 100% combustor inspection R coverage.
(2) Borescope inspect high pressure turbine nozzle vanes (Ref. TASK 72-51-00-290-004) .
(3) Borescope inspect high pressure turbine shrouds (Ref. TASK 72-53-00-290-004).
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Inspection/Check of the Combustion Case Assembly
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
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No specific warning notice
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