Preliminary Requirements

Safety Requirements

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 HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

WARNING

THIS PROCEDURE INCLUDES THE USE OF SODIUM CYANIDE. CYANIDE SALTS AND/OR SOLUTIONS ARE VERY POISONOUS AND WORK VERY QUICKLY. THEY GIVE OFF HYDRO-CYANIC GAS, WHEN MIXED WITH ACID, WHICH CAN KILL. THE PRECAUTIONS THAT FOLLOW MUST ALWAYS BE OBEYED.

WARNING

CYANIDE SALTS AND SOLUTIONS MUST ALWAYS BE KEPT AWAY FROM ACIDS.

WARNING

THERE MUST BE SUFFICIENT VENTILATION.

WARNING

YOU MUST NOT LET NICKEL STRIPPING SALTS TOUCH PAPER, WOOD, CLOTH, OR ANY ORGANIC MATERIAL OTHER THAN NEOPRENE.

WARNING

YOU MUST USE STEEL, STAINLESS STEEL OR NEOPRENE SCOOPS AND CONTAINERS.

WARNING

THE USUAL PRECAUTIONS FOR HOT CYANIDE SOLUTIONS ARE APPLICABLE TO THESE SOLUTIONS.

WARNING

OPERATORS MUST ALWAYS USE THE APPROVED PROTECTIVE CLOTHING SUPPLIED.

FINGER NAILS MUST BE KEPT SHORT AND MUST ALWAYS BE FULLY CLEANED BEFORE YOU EAT, DRINK OR SMOKE.

ITEMS THAT ARE USED TO EAT OR DRINK WITH MUST NOT BE KEPT AT LOCATIONS WHERE CYANIDE IS KEPT OR USED. ALSO, YOU MUST NOT EAT, DRINK OR SMOKE, AT SUCH LOCATIONS.

CYANIDE MUST ALWAYS BE KEPT AT A SAFE LOCATION, WHERE ACCESS IS ONLY AVAILABLE TO APPROVED PERSONS.

A SUPPLY OF CYANIDE ANTIDOTE MUST ALWAYS BE EASILY AVAILABLE.

ALL INSTRUCTIONS GIVEN BY THE SAFETY OFFICER MUST BE OBEYED.

CAUTION

YOU MUST NOT USE THIS PROCEDURE ON PWA44 ALUMINIZED PARTS, SILVER OR COPPER BRAZED PARTS, OR ANY ELECTRO-PLATED PARTS OTHER THAN CHROMIUM PLATED ONLY PARTS.

CAUTION

THIS PROCEDURE WILL DAMAGE ALUMINIDE COATINGS ON TURBINE PARTS. ALL AREAS OF PARTS THAT ARE NOT TO BE STRIPPED MUST BE WAX MASKED BEFORE THEY ARE PUT IN TO THE STRIPPING SOLUTION. REFER TO TASK 70-38-24-300-503.

CAUTION

THE SOLUTIONS USED IN THIS PROCEDURE MUST NOT BE USED IN ANY OTHER PROCEDURE WHICH REMOVES COATINGS, UNLESS LOCAL EXPERIENCE RECOMMENDS THEM. UNKNOWN CROSS CONTAMINATION EFFECTS OF COATING RESIDUES CAN OCCUR IF THEY ARE USED WHEN THEY ARE NOT RECOMMENDED.

Procedure

1. SUBTASK 70-33-80-300-001 Remove the Grease

   1. Vapor degrease the part if necessary for half a minute. Refer to TASK 70-11-01-300-503.

2. SUBTASK 70-33-80-300-002 Remove the Plasma Coating

   
   CAUTION
   YOU MUST NOT LET THE PARTS STAY IN THE SOLUTION FOR MORE THAN A MAXIMUM OF 60 MINUTES.

   1. Put the part(s) in to applicable baskets or fixtures made of heat and corrosion resistant material.

   2. Put the parts fully in to one of the nickel strip solutions (refer to the SPM TASK 70-33-80-100-501) at a temperature of 90 to 110 deg F (32 to 43 deg C).

   3. Clean the parts in a flow of cold water for half a minute.

   4. Clean the parts with a compressed air/water spray for half to one minute at room temperature.

   5. Examine the parts. If the plasma coating has not been removed sufficiently do steps A. thru D. again. The parts can be put in to the solution again up to a maximum of 8 times.

   6. Clean the parts in hot water for half a minute. The water must be at a temperature of 140 deg F (60 deg C) minimum.

   7. Dry the parts for one to three minutes with compressed air.

   8. 
      CAUTION
      YOU MUST NOT LET THE GRIT BLAST STAY IN ONE AREA OF THE PART OR DAMAGE WILL OCCUR. AREAS THAT ARE NOT COATED ARE EASILY DAMAGED.

      Examine the parts. If the coatings have not been removed completely then grit blast as necessary until the coatings are completely removed.

      1. Refer to the SPM TASK 70-12-09-120-501 for the procedure to grit blast. Use one of the grits given below:

         CoMat 05-035 ALUMINUM OXIDE ABRASIVE.

         CoMat 05-036 DELETED.

         CoMat 05-037 DELETED.

         CoMat 05-038 SILICON CARBIDE ABRASIVE.

         CoMat 05-040 DELETED.

      2. 

         CAUTION

         YOU MUST USE A WIRE BRUSH WHICH HAS BRISTLES OF AUSTENITIC CORROSION RESISTANT STEEL.

         If necessary, remove any remaining coating with a tampico or wire brush, or by wet abrasive blasting (refer to the SPM TASK 70-12-08-300-503 or SPM TASK 70-12-06-120-501), or by grit blast as in step H.(1).

   9. Preserve the part for a half to one minute at room temperature in CoMat 10-028 CORROSION PREVENTIVE SLUSHING OIL, or CoMat 10-029 CORROSION PREVENTIVESLUSHING OIL, or CoMat 10-030 CORROSION PREVENTIVESLUSHING OIL, or CoMat 12-015 CORROSION PREVENTIVE, FINGERPRINT REMOVER, or CoMat 12-016 CORROSION PREVENTIVE THIN FILM, or CoMat 12-027A CORROSION PREVENTIVE COMPOUND, if necessary.