Preliminary Requirements

Procedure

1. SUBTASK 72-31-11-350-068 Prepare for Anodizing

   1. Refer to Figure.

   2. Remove the locating pin.

      1. Refer to VRS1010, TASK 72-31-11-300-005 (REPAIR-005).

   3. Remove the seals and pads.

      1. Refer to VRS1018, TASK 72-31-11-300-022 (REPAIR-022) or VRS1007, TASK 72-31-11-300-003 (REPAIR-003).

   4. Remove the screw thread insert.

      1. Refer to VRS1017, TASK 72-31-11-300-023 (REPAIR-023) or VRS1013, TASK 72-31-11-300-014 (REPAIR-014).

   5. Remove the dry film lubricant.

      1. Refer to VRS1735, TASK 72-31-11-300-020 (REPAIR-020) or VRS1008, TASK 72-31-11-300-004 (REPAIR-004).

   6. Remove the heat resistant ES coating.

      1. Refer to VRS1009, TASK 72-31-11-300-002 (REPAIR-002).

   7. Remove the anodized coating.

      1. Refer to TASK 72-31-11-100-000 (CLEANING-000).

2. SUBTASK 72-31-11-230-059 Examine the Annulus Filler for Cracks

   1. Do a penetrant crack test.

      1. Refer to TASK 72-31-11-200-000 (INSPECTION/CHECK-000).

3. SUBTASK 72-31-11-330-051 Prepare the Annulus Filler for Anodizing

   1. NOTE

      This SUBTASK is an alternative to Step.

      Prepare the annulus filler to apply the anodized coating.

      1. Refer to the SPM TASK 70-33-20-300-503.

4. SUBTASK 72-31-11-330-006 Prepare the Annulus Filler for Anodizing

   1. NOTE

      This SUBTASK is an alternative to Step.

      NOTE

      All repairs and inspections must be completed, before anodizing.

      Prepare the annulus filler for anodizing.

      1. Attach the part to the applicable suspender.

         1. NOTE

            If the aluminium wire is used, make sure that there is good electrical connection, between the wire and parts.

            Use suspenders with titanium contact faces or aluminium wire.

      2. Soak the part in solution for 10 to 30 minutes, at temperature of 122 to 140 deg F (50 to 60 deg C), as necessary.

         1. Use CoMat 01-339 ALKALI CLEANER (GENERAL PURPOSE) of 15 to 30 per cent.

      3. Flush the part in clean hot and/or cold water.

5. SUBTASK 72-31-11-330-007 Apply the Anodize Coating

   1. NOTE

      This SUBTASK is an alternative to Step.

      Chromic anodize the annulus filler.

      1. Use the chromic anodizing facility.

      2. Refer to the SPM TASK 70-33-20-300-503.

6. SUBTASK 72-31-11-330-008 Apply the Anodized Coating

   1. 
      WARNING
      CHROMIC ACID SPRAY IS INJURIOUS IF INHALED, CAUSING ULCERS IN THE NOSE AND IN SOME CASES, PERFORATION OF THE NASAL SEPTUM. CHROMIC ACID SALTS AND SOLUTIONS IN CONTACT WITH THE SKIN MAY CAUSE CHROME SORES. ULCERS MAY BE FORMED IF CHROMIC ACID GETS INTO CUTS AND ABRASIONS.
      
      WARNING
      CHROMIC ACID SOLUTION MUST NEVER BE USED UNLESS THE FUME EXTRACTION PLANT IS IN OPERATION AND IS FULLY SERVICEABLE.
      
      WARNING
      BARRIER CREAM SHOULD BE APPLIED TO THE HANDS AND FOREARMS BEFORE STARTING WORK.
      
      WARNING
      PROTECTIVE GLOVES, OVERALLS, GOGGLES OR FACE VISOR AND SAFETY SHOES OR BOOTS MUST BE WORN.
      
      WARNING
      SMOKING AND THE CONSUMPTION OF FOOD NEAR THE CHROMIC ACID BATH ARE PROHIBITED.
      
      WARNING
      CUTS AND ABRASIONS, WHICH APPEAR NOT TO BE HEALING READILY SHOULD BE REPORTED, WITHOUT DELAY, TO THE MEDICAL DEPARTMENT.
      
      WARNING
      CHROMIC ACID IS STRONGLY OXIDIZING AND ENTAILS SOME FIRE RISK, POSSIBLE SPONTANEOUS COMBUSTION OF ORGANIC MATERIALS, SUCH AS RAGS AND SAWDUST, WHICH HAVE ABSORBED CHROMIC ACID SOLUTION. SUCH CONTAMINATED MATERIALS SHOULD BE IMMERSED IN A SOLUTION OF SODIUM BISULPHATED TO NEUTRALISE THE CHROMIC ACID, THE SOLUTION SHOULD THEN BE DISPOSED OF AS SPECIAL WASTE. THE SOLID MATERIAL SHOULD THEN BE RINSED WITH WATER PRIOR TO DISPOSAL.
      
      WARNING
      IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLNG, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS IN TO CONSIDERATION.
      
      CAUTION
      THE ANODIZING PROCEDURE MUST BE CAREFULLY CONTROLLED, BECAUSE DAMAGE TO THE PARTS CAN BE CAUSED.

      NOTE

      Step must be carried out within eight hours of anodizing.

      NOTE

      This SUBTASK is an alternative to Step.

      Make up the chromic anodize solution.

      1. Use the chromic anodizing facility.

         1. The solution is made up of 6.6 to 14 oz/gal (50 to 105 g/l) CoMat 01-023 CHROMIUM TRIOXIDE CrO3(CHROM.ACID) in CoMat 01-201 DISTILLED, DEIONIZED, DEMINERALIZED, OR REVERSE OSMOSIS (RO) WATER.

   2. Soak the part fully into the chromic anodize solution, at temperature of 89.6 to 100.4 deg F (32 to 38 deg C).

   3. NOTE

      When the part as been installed, make sure that air bubbles can not occur.

      NOTE

      The solution must be constantly mixed, by a pump or with clean compressed air, to make sure that temperature is kept constant, through the full bath.

      Install the part and connect to the positive pole of the DC electrical power supply.

   4. Apply the current so that the voltage across the bath is increased (In maximum steps of 3 to 4 volts per minute, from 0 to 30 through 40 volts), during the first 10 minutes. Keep at 30 to 40 volts for 40 to 50 minutes.

   5. Remove the part from the solution.

   6. NOTE

      Make sure that all the solution is removed.

      Quickly drain and fully flush in a clean cold water flow.

   7. NOTE

      Step must be carried out within eight hours of anodizing.

      Nickel acetate seal the part.

      1. NOTE

         Make sure that the pH value of solution is 5.3 to 6.0.

         NOTE

         The pot life of sealing solution is about one week.

         Make up the nickel acetate sealing solution.

         1. Use CoMat 01-530 Nickel acetate (Mixture).

         2. The solution is made up of 0.93 oz/gal (7 g/l) of nickel acetate in CoMat 01-201 DISTILLED, DEIONIZED, DEMINERALIZED, OR REVERSE OSMOSIS (RO) WATER.

      2. Soak the part fully into the solution for 30 to 40 minutes, at temperature of 20 to 212 deg F (95 to 100 deg C).

      3. Remove the part from the solution.

      4. Quickly drain and fully flush in a clean cold water flow.

      5. Put the part into clean, hot water for a short time, at a minimum temperature 176 deg F (80 deg C).

      6. Dry the part with compressed air.

      7. Remove the part from the suspender or wire.

      8. NOTE

         A chromate conversion coating can be used to small areas (5 per cent minimum) where the anodic coating is damaged, or is not complete.

         Examine the part.

         1. Electrical contact mark is allowable.

         2. Make sure it is continuous and free from any defects.

7. SUBTASK 72-31-11-380-061 Apply the Primer to the Annulus Filler

   1. 

      WARNING

      AVOID REPEATED OR PROLONGED CONTACT WITH THE PRIMER. USE ONLY IN AREAS WITH GOOD VENTILATION. VERY FLAMMABLE, KEEP AWAY FROM IGNITION SOURCES.

      NOTE

      This SUBTASK must be carried out within eight hours of anodizing.

      Refer to Figure and Figure.

   2. Apply the masking tape.

      1. Apply the masking tape to the areas which are not to be given a layer of primer.

      2. Use CoMat 02-019 TAPE, ADHESIVE PAPER HEAT RESISTING MASKING or CoMat 02-002 ADHESIVE TAPE GENERALPURPOSE PAPER.

   3. Apply the primer.

      1. Use CoMat 08-020 EPOXY PRIMER,RED.

      2. Apply an even coating to a thickness of 0.00039in. (0.010 mm), with spraying equipment.

   4. Remove the masking tape.

   5. Cure the primer.

      1. Cure at between 340 and 355 deg F (170 and 180 deg C) for one hour.

8. SUBTASK 72-31-11-220-086 Examine the Anodized Coating

   1. Visually examine the anodized coating.

      1. Refer to the SPM TASK 70-33-20-300-503.

      2. Make sure that the coating is continuous and even.

9. SUBTASK 72-31-11-220-087 Examine the Annulus Filler Trunnions

   1. Refer to Figure.

   2. Dimensionally inspect the trunnions (Dia E and Dia G).

      1. Refer to TASK 72-31-11-200-000 (INSPECTION/CHECK-000).

10. SUBTASK 72-31-11-380-062 Apply the Dry Film Lubricant and the Heat Resistant ES Coating to the Annulus Filler

    1. Apply the dry film lubricant.

       1. Refer to VRS1735, TASK 72-31-11-300-020 (REPAIR-020) or VRS1008, TASK 72-31-11-300-004 (REPAIR-004).

    2. Apply the heat resistant ES coating.

       1. Refer to VRS1009, TASK 72-31-11-300-002 (REPAIR-002).

11. SUBTASK 72-31-11-350-069 Install the Seals, Pad, Pin and Insert to the Annulus Filler

    1. Install the seals and pads.

       1. Refer to VRS1018, TASK 72-31-11-300-022 (REPAIR-022) or VRS1007, TASK 72-31-11-300-003 (REPAIR-003).

    2. Install the locating pin.

       1. Refer to VRS1010, TASK 72-31-11-300-005 (REPAIR-005).

    3. Install the screw thread insert.

       1. Refer to VRS1017, TASK 72-31-11-300-005 (REPAIR-023) or VRS1013, TASK 72-31-11-300-014 (REPAIR-014).

12. SUBTASK 72-31-11-350-070 Make a Mark on the Annulus Filler

    1. Vibro-engrave VRS1019 adjacent to the part number.

       1. Refer to the SPM TASK 70-09-00-400-501.

          1. Use a Vibrating marking pencil.

    2. Apply chromate conversion coating to the marking letters.

       1. Refer to the SPM TASK 70-38-02-300-503, SUBTASK 70-38-02-300-002.

Figure: Repair details and dimensions

Repair details and dimensions



Figure: Repair details and dimensions

Repair details and dimensions