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TASK 72-51-01-300-811
1 . Chrome Carbide Erosion Coating Repair.
A.This procedure gives instructions to repair the high pressure turbine forward inner nozzle support (nozzle support) erosion coating by machining or by water jet and re-applying the coating to area BC with a thermal spray. Refer to Figure 901.
B.The following maximum repairable limits apply to this repair:
NOTE:
The information below gives maximum repairable limits for the applicable Inspection sections. The paragraphs are numbered the same as the manual Inspection sections.
(4)Visual Inspection.
(h)Do an inspection of the inner diameter of the forward flange area. Refer to Figure 802 and as follows:
* * * SB   72-0359
3Missing, eroded or damage hard coat in area BC:
Maximum repairable limit:
Any amount.
C.The subsequent table gives a list of the part numbers that are applicable to this procedure. All part numbers are applicable to all paragraphs unless specified differently.
 
Part Number(s)
 
2303M22G08  
2303M22G09  
2303M22G10  
2407M46G06  
 
2407M46G08  
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D.Proprietary/Complex Process Statement.
(1)None.
2 . Tools, Equipment, and Materials.
NOTE:
Repair sources can use equivalent alternatives for tools, equipment, and consumable materials, however, the repair source must demonstrate and document equivalency.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials.
 
Code No.
Description
 
C07-027
75% Chromium Carbide; 25% Nickel Chromium Powder (chromium carbide powder)
 
C10-012
Tape Masking, High Temperature - CHR. Pressure-sensitive Adhesive Tape 2905-7 (tape)
C.Referenced Procedures.
 
ATA No.
Description
 
70-00-03
Machining Data
 
70-23-00
Stripping Procedures
 
70-23-23
Removal of Coatings by High Pressure Water Stripping
 
70-24-00
Etching Procedures for Fluorescent-Penetrant Inspection
 
70-24-01
Swab Etching Procedure
 
70-32-00
Indirect Inspection Methods
 
70-32-02
Fluorescent Penetrant Inspection
 
70-42-00
Blending and Removal of High Metal Procedures
 
70-49-00
Thermal Spraying
 
70-49-29
Thermal Spraying 75 percent Chromium Carbide - 25 percent nickel chromium (Powder)
 
72-51-01
Inspection 001
 
72-51-01
Cleaning 001
 
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GEAE Photo Standard 8311253, Class 30
D.Expendable Parts. None.
E.SPD Information.
(1)Spare Supplied. None.
(2)Protected Spares. None.
(3)Locally Manufactured Spares. None.
F.Special Solutions. None.
G.Test Specimens.
 
Standard
Quantity
 
70-49-29, Thermal Spraying Chrome Carbide-Nickel-Chromium (Powder)
1
3 . Dimensional Information.
Subtask 72-51-01-220-111
A.Refer to Figure 901 for specified dimensions and locations.
NOTE:
The dimensional data identified within this procedure was designed using inches as the base unit of measurement for dimensional values. The conversion to millimeters is rounded to one less decimal digit than inches. For minimum dimensions, converted values are rounded up. For maximum dimensions, converted values are rounded down. To avoid conversion errors, do not re-convert from millimeters to inches.
NOTE:
Reference dimensions do not require inspection.
4 . Setup Information.
None.
5 . Procedure.
Subtask 72-51-01-160-023
A.If necessary, clean the nozzle support. Refer to TASK 72-51-01-100-801 (72-51-01, CLEANING 001).
Subtask 72-51-01-320-016
B.Alternative Procedure Available. Machine to remove the chrome carbide coating from the nozzle support area BC. Refer to TASK 70-00-03-800-004 (MACHINING DATA), Subtask 72-51-01-220-011 (paragraph 3.A.), and Figure 901.
(1)Adjust the position of the nozzle support to get surface C (datum C) flat, and to agree with the limits. Refer to Figure 901.
(2)Adjust the position of the nozzle support to get the diameter of surface B (datum B) to agree with the limits. Refer to Figure 901.
CAUTION:
DO NOT MACHINE THE NOZZLE SUPPORT MORE THAN WHAT IS NECESSARY TO REMOVE THE OLD HARD COAT. IF YOU INCREASE DIAMETER K TO MORE THAN THE PERMITTED LIMIT, DAMAGE TO THE NOZZLE SUPPORT WILL OCCUR.
(3)Machine the area BC.
(4)Remove the remaining areas of coating by blending. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
(5)For PN 2303M22, do the wall thickness inspection in area BC. The minimum wall thickness must be 0.104 inch (2.65 mm).
(6)For PN 2407M46, do the wall thickness inspection in area BC. The minimum wall thickness must be 0.079 inch (2.01 mm).
Subtask 72-51-01-330-001
B.A.Alternative Procedure. Remove the chrome carbide coating from the nozzle support area BC. Refer to TASK 70-23-00-100-001 (STRIPPING PROCEDURES), TASK 70-23-23-330-008 (REMOVAL OF COATINGS BY HIGH PRESSURE WATER STRIPPING), and Figure 901.
CAUTION:
DO NOT REMOVE MATERIAL FROM THE NOZZLE SUPPORT MORE THAN WHAT IS NECESSARY TO REMOVE THE OLD HARD COAT. IF YOU INCREASE DIAMETER K TO MORE THAN THE PERMITTED LIMIT, DAMAGE TO THE NOZZLE SUPPORT WILL OCCUR.
(1)Remove from area BC.
(2)Deleted.
(3)For PN 2303M22, do the wall thickness inspection in area BC. The minimum wall thickness must be 0.104 inch (2.65 mm).
(4)For PN 2407M46, do the wall thickness inspection in area BC. The minimum wall thickness must be 0.079 inch (2.01 mm).
Subtask 72-51-01-160-024
C.Clean the nozzle support. Refer to TASK 72-51-01-100-801 (72-51-01, CLEANING 001).
Subtask 72-51-01-110-038
D.Etch the nozzle support machined areas. Refer to TASK 70-24-00-110-033 (ETCHING PROCEDURES FOR FLUORESCENT-PENETRANT INSPECTION), TASK 70-24-01-110-034 (SWAB ETCHING PROCEDURE), and as follows:
(1)Use Class C etchant.
Subtask 72-51-01-230-032
E.Do an inspection of the nozzle support. Refer to TASK 70-32-00-200-002 (INDIRECT INSPECTION METHODS), TASK 70-32-02-230-001 (FLUORESCENT PENETRANT INSPECTION), Figure 901, and as follows:
(1)Use Class C penetrant.
(a)Indications 0.030 inch (0.76 mm) or less are not interpretable and are permitted.
(b)Non-linear indications 0.060 inch (1.52 mm) or less with a minimum distance of between indications of 0.15 inch (3.9 mm) are permitted.
(c)Linear indications more than 0.030 inch (0.76 mm) are not permitted.
NOTE:
Linear indications are indications that are at least four times longer than they are wide.
(d)Through indications are not permitted.
(e)For PN 2407M46, microshrinkage must agree with GEAE Photo Standard 8311253, Class 30.
Subtask 72-51-01-220-112
F.Do a visual inspection of the nozzle support into the parent material to make sure that there is no erosion. Refer to Figure 901 and as follows:
(1)Part needs to be serviceable, refer to TASK 72-51-01-200-801 (72-51-01, INSPECTION 001) section.
(2)If there is erosion into the parent material for other areas, you must not repair the nozzle support with this procedure.
Subtask 72-51-01-160-025
G.If necessary, clean the nozzle support. Refer to TASK 72-51-01-100-801 (72-51-01, CLEANING 001).
Subtask 72-51-01-340-001
H.Apply a chrome carbide coating to area BC on the internal diameter of the forward section of the nozzle support body. Refer to Figure 901 and as follows:
(1)Use C10-012  tape to mask all internal openings and cavities of the inducer and honeycomb seal to keep dirt and unwanted material out.
(2)Use C10-012  tape to mask all surfaces adjacent to area BC.
(3)Prepare test specimens for coating application. Refer to TASK 70-70-00-700-001 (TESTING AND QUALITY ANALYSIS), table 2, and as follows:
(a)Put the test specimens in an area that will allow them to receive the same amount of coating as does the part.
(4)Apply thermal spray to area BC with C07-027  chromium carbide powder. Refer to TASK 70-49-00-340-001 (THERMAL SPRAYING), TASK 70-49-29-340-030 (THERMAL SPRAYING 75 PERCENT CHROMIUM CARBIDE - 25 PERCENT NICKEL CHROMIUM (POWDER)), and as follows:
(a)The thickness of the chrome carbide coating must be 0.007-0.010 inch (0.18-0.25 mm).
(b)If necessary, blend the surface to remove the loose particles. Refer to TASK 70-42-00-350-002 (BLENDING AND REMOVAL OF HIGH METAL PROCEDURES).
(5)Do all the quality assurance tests. Refer to TASK 70-49-29-340-030 (THERMAL SPRAYING 75 PERCENT CHROMIUM CARBIDE - 25 PERCENT NICKEL CHROMIUM (POWDER)).
Subtask 72-51-01-160-026
I.If necessary, clean the nozzle support. Refer to TASK 72-51-01-100-801 (72-51-01, CLEANING 001).
Subtask 72-51-01-220-113
J.Do a visual inspection of the thermal spray coating and adjacent coated surfaces for bond and surface condition. Refer to TASK 70-49-29-340-030 (THERMAL SPRAYING 75 PERCENT CHROMIUM CARBIDE - 25 PERCENT NICKEL CHROMIUM (POWDER)).
Subtask 72-51-01-220-114
K.Do a final inspection of the nozzle support. Refer to TASK 72-51-01-200-801 (72-51-01, INSPECTION 001).
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Figure 901   (Sheet 1 ) High Pressure Turbine Stage 1 Nozzle Support - Dimensional Information
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Figure 901   (Sheet 2 ) High Pressure Turbine Stage 1 Nozzle Support - Dimensional Information
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Figure 901   (Sheet 3 ) High Pressure Turbine Stage 1 Nozzle Support - Dimensional Information
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Figure 901   (Sheet 4 ) High Pressure Turbine Stage 1 Nozzle Support - Dimensional Information