REVISION HISTORY

Revision A: Dated – October 8, 2008

Add approval signatures and dates.

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  1. Aqueous Cleaning Procedures.

1.1 The parts shall be inspected for foreign particles and pre-cleaned to remove large

 quantity of material.

  1.1.1 Small parts shall be cleaned in an ultra sonic cleaner when possible for

20 – 30 minutes using hot water, approximately 120 degrees to 140 degrees

F and a caustic detergent. If large quantities are to be cleaned, the parts

   shall be cleaned in a conveyer washer to minimize operation time.

  1.1.2 Larger parts, piping, tubing, trays, blocks and etc., shall be pressure washed

using hot water at 120 degrees to 140 degrees F, and a caustic detergent,

then pressure rinsed with hot water at 120 degrees to 140 degrees F. If

large quantities are cleaned and size is acceptable, the parts shall be cleaned

in a conveyor washer to minimize operation time.

  1.1.3 The final rinse of all parts shall utilize DI Water to offset staining and

removal of potable water contaminates, chemicals, metals and etc.

  1.1.4 Clean filtered air shall be used for drying of parts. When practical, hot

filtered air shall be used.

  1.1.5 The selection of the cleaning detergent shall be determined by the material

to be cleaned.

  1. Inspection

2.1 The following inspection procedure shall be used to determine cleanliness of

the components.

2.1.1 Visual inspection – White light – Observe the part under an intense

white light. Most contaminates can be observed by this method in

detecting larger particles 50 microns or larger. For internal

inspection, use a lint free swab to wipe the surface. Any particle

or smudge constitutes a rework of the contaminated surface.

    2.1.2 Visual inspection – Black light – Observe the part under a black

light (ultraviolet) which causes most common hydrocarbon or

organic oils to fluoresce. All oils do not fluoresce under

ultraviolet light so a secondary inspection procedure may be used.

If the part has been wiped with a cotton cloth, some fluoresce may

be seen because of the cotton lint, this is acceptable but should be

removed using a pressure blow off of oil free air or nitrogen gas.

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    2.1.3 Water break test – If the part has an oily or greasy residue on the

     surface, a light spray of clean water may be used. If the water

   forms a thin layer and displays no broken feature for five seconds,

   no oil is present. If the water beads repeat the cleaning process.

    2.1.4 Wipe test – Using a clean lint free cloth or white paper, rub the

cleaned surface hard enough to remove any existing oxide.

Examine the residue under a white light or black light. If

unacceptable foreign material is present clean the component

again.

  1. Packaging

3.1 The following packaging process shall be used as follows.

3.1.1 Small parts shall be placed in plastic bags and heat sealed to assure

protection from outside sources.

    3.1.2 Large parts shall be wrapped in plastic wrap to assure protection

from outside contamination.

  1. Personnel safety – All aqueous cleaning operations shall be carried out in a manner which

provides for the safety of all personnel performing the cleaning and the surrounding personnel

and shall conform to all local, federal and state ordinances and regulations.

4.1 All personnel shall be trained and instructed in the safe use of the cleaning

procedures and materials used in the cleaning process including the hazards

associated with these materials.

4.2. Special consideration should be given to the safe disposal of waste cleaning

solution and materials.

4.3 Protective equipment – Face shields and goggles shall be used for face or eye

protection from cleaning solutions. Protective clothing shall be used when required

to prevent cleaning solutions from contacting the skin.

4.4  Proper ventilation – All areas where cleaning operations are performed shall be

adequately ventilated. If the operations are performed in an area where wind flow is

a factor, the work shall be performed upwind so the vapors are ventilated away from

the operation.

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