3. Acetone (halogen-free) CP1039
- Non-aqueous wet developers are approved for use in aerosol spray only. Tracer-tech solvent mixed developer D499C is approved for bulk use with any penetrant system. A developer from one manufacturer may be substitued for another manufacturer's developer.
4. Procedure
_________
Subtask 70-51-00-230-051
A. Fluorescent-penetrant inspection - Procedure.
NOTE : Parts must be cleaned before their inspection process. Plug or cap
____ tubes and holes in the area to be inspected to prevent inspection materials from being entrapped.
(1) Application of Penetrant.
WARNING : PENETRANT IS FLAMMABLE. THE FLASH POINT OF PENETRANT IS
_______ CONSIDERABLY LOWERED WHEN USED AS A FINE SPRAY. TAKE PRECAUTIONS AGAINST FIRE.
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(b) Allow 20 to 60 minutes for penetration.
(2) Removal of excess penetrant.
(a) Remove excess penetrant by wiping with a clean dry cloth.
(b) Remove background fluorescence by wiping with a clean cloth dampened with water or solvent.
(c) Observe part under ultraviolet light to make sure excess penetrant has been removed.
(d) If excess background fluorescence persists, spray rinse using water from a squeeze bottle.
NOTE : Care must be taken to apply minimum amount of water
____ because excess water will remove penetrant indications.
(e) Alternate: Remove excess penetrant with a hydrophilic remover provided it belongs to the same family as the penetrant used. Do not exceed 90 seconds contact time. If remover is applied manually, do not scrub the suface of the part with the applicator. Use applicator only to deliver fluid to the part surface.
(3) Application of Developer.
WARNING : AVOID BREATHING OF VAPORS.
_______
(a) Apply developper by spray only to a dry part at ambient temperature. Apply a fine thin coating by holding spray nozzle about 8-10 inches (200-250 mm) from part surface. Normally 2 passes are adequate. Coverage should be uniform and a metallic background should be visible through the developer.
NOTE : When using aerosol container, follow the manufacturer's
____
directions.
(b) Allow 10 minutes for developer to absorb penetrant.
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CAUTION : THE USE OF HIGH INTENSITY (125 WATT) ULTRAVIOLET BULBS
_______ WHICH EMIT AN EXCESS AMOUNT OF WHITE LIGHT WILL AFFECT THE SENSITIVITY OF THE FLUORESCENT-PENETRANT PROCESS. USE ONLY BULBS CERTIFIED BY THE NDT ORIGINAL EQUIPMENT MANUFACTURER AS HAVING PASSED THEIR IN-HOUSE INSPECTION. IN ADDITION, THESE HIGH INTENSITY BULBS SHOULD BE PERIODICALLY TESTED FOR WHITE LIGHT EMISSION PER STANDARD PRACTICE 70-00-06.
(a) Direct ultraviolet light on part while in inspection booth or darkroom or under a black cloth hood.
(b) Inspect to limits specified for the parts.
(c) Inspect questionable indications as follows:
WARNING : CLEANING SOLVENTS ARE FLAMMABLE, VOLATILE, TOXIC. THEY
_______ SHOULD BE USED WITH ADEQUATE VENTILATION. AVOID PROLONGED BREATHING OF VAPORS AND REPEATED OR PROLONGED CONTACT WITH THE SKIN, OR CLOTHING.
1 Wipe area once with solvent listed in paragraph 3, using a
_
cotton swab or fine-hair art brush.
2 Apply developer to suspected area after solvent has dried.
_
3 Inspect under ultraviolet light. Indications that reappear
_ within 2 minutes shall be considered as valid indications.
4 If indications do not reappear, inspect part under white light
_
using a 10-power magnifying lens.
(d) Identify location of defects using an approved marking method.
(5) Cleaning of Parts after Inspection.
CAUTION : ALL RESIDUAL PENETRANTS AND DEVELOPER MATERIAL MUST BE
_______ REMOVED FROM PARTS AS SOON AS POSSIBLE. UNREMOVED MATERIAL CAN CAUSE SEVERE CORROSION OF PARTS AT ELEVATED TEMPERATURES. WHEN CLEANING PARTS MADE OF TITANIUM OR TITANIUM ALLOYS WITH SOLVENT, USE ONLY SOLVENTS THAT DO NOT CONTAIN HALOGENS. WHEN CLEANING PARTS MADE OF TITANIUM OR TITANIUM ALLOYS WITH WATER, USE ONLY DEIONIZED WATER.
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(a) Remove developer and penetrant by water spray washing or scrubbing the part with brush and water.
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