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

EVERY POSSIBLE CARE MUST BE TAKEN TO AVOID THE SOLUTION COMING INTO CONTACT WITH THE EYES ON BARE SKIN. PROTECTIVE CLOTHING INCLUDING RUBBER GLOVES AND GOGGLES MUST BE PROVIDED FOR THE OPERATORS WHEN PREPARING AND USING THE NITRIC ACID SOLUTION. RUBBER GLOVES SHOULD BE CHECKED REGULARLY FOR PIN HOLES AND REPLACED IF NECESSARY.

WARNING

SAFETY NOTICES MUST BE REPLACED IN A CONSPICUOUS PLACE.

WARNING

EYE-WASH BOTTLES AND HF BURN JELLY MUST BE PROVIDED AS CLOSE AS POSSIBLE TO THE PLACE OF WORK.

WARNING

IF SKIN BECOMES CONTAMINATED WITH THE SOLUTION IT MUST BE RINSED WITH COPIOUS AMOUNTS OF CLEAN RUNNING WATER.

WARNING

ALL BURNS, HOWEVER SLIGHT, SHOULD BE TREATED AT THE NEAREST SURGERY OR FIRST AID POST.

WARNING

THE SURGERY MUST BE TOLD WHICH SOLUTION (THE ACIDS INVOLVED) HAS CAUSED THE BURN.

Procedure

1. SUBTASK 70-33-89-300-001 Vapor Degrease the Part

   1. Vapor degrease the part as given in the SPM TASK 70-11-01-300-503, then let the part cool.

2. SUBTASK 70-33-89-300-002 Clean the Part in Nitric Acid

   1. 

      CAUTION

      LOW ALLOY STEELS MUST NOT BE PUT IN TO THE NITRIC ACID SOLUTION.

      THE NITRIC ACID STRENGTH MUST NOT GO BELOW 30 PERCENT V/V IF FERRITIC STAINLESS STEELS ARE TO BE PUT IN TO THE SOLUTION.

      PARTS WHICH HAVE NICKEL, ELECTROLESS NICKEL PLATING OR SPRAYED METAL/ABRADABLE COATINGS MUST NOT BE PUT IN TO THE NITRIC ACID SOLUTION, UNLESS NEW PLATINGS OR COATINGS ARE TO BE PUT ON.

      Put the part fully in to an air agitated stainless steel tank or suitable non-metallic tank which contains nitric acid solution. The nitric acid solution, prepared in SPM TASK 70-33-89-100-501 must be at a temperature of 59 to 77 deg F (15 to 25 deg C). Soak the part for the time given in the applicable Standard Practice/Process or Engine Manual.

   2. NOTE

      If the subsequent step is to vapor blast, put the part fully into clean, cold water until it is necessary to vapor blast.

      Remove the part from the nitric acid solution and immediately flush the part in clean, cold water.