MIL-STD-1330D(SH)
20 September 1996
(a) Components shall be dried until no moisture is visible using any method that does not result in loss of cleanliness. Ovens, vacuum ovens, dryers, heat guns, and dry filtered nitrogen have been successfully used. The method chosen for drying shall be verified oxygen clean during the validation process as specified in 5.15. Appropriate precautions shall be taken to prevent damaging components and software from excessive heat. For components with inaccessible areas, drying to plus 20EF dew point is acceptable.
(b) During reassembly, use oxygen compatible lubricants as specified in
4.9 sparingly.
(c) Components shall be packaged as specified in 5.16.
5.3 Flask cleaning and inspection.
5.3.1 Applicability. Flask cleaning and inspection is applicable to flasks in the boundaries defined in 1.2.
5.3.2 Material and equipment.
(a) A supply of rinse water and associated equipment for rinsing flasks.
(b) A supply of NOC or TSP final cleaner as specified in 4.3. (c) A supply of helium or nitrogen.
(d) Equipment as required to perform visual inspection and clean the flask.
(e) Equipment to perform the applicable analyses as specified in 5.13.
This includes clean 1-liter containers to obtain the required
samples.
(f) Equipment as required to remove paint from flask surfaces.
(g) A dew point indicator equal to the Ondyne Series 1400 Dewpoint
Indicator or the MCM Dewluxe Model hygrometer capable of detecting a dew point of minus 40EF (128 ppm H2O).
5.3.3 Clean, verification, and rinse. Cleaning, verification, and rinsing should be accomplished in a controlled area with the flasks positioned vertically to facilitate drainage as follows:
(a) Flasks final cleaned with a fill and recirculate process as specified in 5.3.3.(b) or 5.3.3.(c) shall be pre-cleaned as specified in 5.2.4 using a compatible pre-cleaner and then rinsed with water until all visible oil, grease, ink, dye, and cleaning agent is removed. Flasks final cleaned with a spray process as specified in 5.3.3.(b) or 5.3.3.(c), or flasks with no visual evidence of oil, grease, ink, or dye may eliminate the pre-clean step and proceed directly to final clean.
(b) If final cleaning flask interior surfaces with NOC, apply NOC at not less than 120EF for a time sufficient to ensure all wetted surfaces are in contact with the cleaner for not less than 10 minutes if using a spray process or at 150 to 170EF for not less than 30 minutes if using a fill and recirculate process. Use of sprayers with high flow and low pressure or low flow and high pressure are recommended.
(c) If final cleaning flask interior surfaces with TSP, apply TSP at
160 to 180EF for a time sufficient to ensure all wetted surfaces are in contact with the cleaner for not less than 10 minutes if using a spray process or not less than 30 minutes if using a fill and recirculate process. Use of sprayers with high flow and low pressure or low flow and high pressure are recommended. When
using TSP, the flask shall be preheated by circulating hot grade B
water through the flask. In order to prevent precipitation of
TSP, the TSP shall not be allowed to cool or remain uncirculated
prior to rinsing as specified in 5.3.3.(e).
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