MIL-STD-1622B(SH)
5.3 Component cleaning process for critical applications.
5.3.1 Applicability. This component cleaning process is for critical application items that can be fully immersed in the ultrasonic tank or parts washer specified in 5.3.3. Large components such as flasks shall be cleaned as specified in 5.4 or as otherwise approved (see 6.3).
5.3.2 Objective. The objective of this aqueous component cleaning process is to remove all visible soil and particulate during the preclean and rinse step as specified in 5.3.4 before proceeding to a final clean, verification, and rinse step as specified in 5.3.5. The objective of the final clean, verification, and rinse step is to apply a breathing system safe
cleaning agent to remove thin soil films and particulate that may remain after the preclean step and to verify the required cleanliness. An effective preclean step increases the probability of a successful final clean and verification step reducing overall process cost and time.
5.3.3 Material and equipment.
(a)A supply of rinse water and associated equipment such as sinks, spray nozzles, and ultrasonic tanks.
(b)A supply of compatible precleaner as specified in 4.2 or 4.3 and associated equipment such as brushes, sinks, spray nozzles, and ultrasonic tanks.
(c)A supply of NOC or TSP as specified in 4.2 in an ultrasonic tank or parts washer meeting 5.3.3(f).
(d)A supply of air or nitrogen if used for drying. (e)A clean area as specified in 5.1.
(f)An ultrasonic cleaning tank of sufficient size to allow complete immersion of the component being cleaned. The tank shall be capable of being heated to 160oF for NOC or 180oF for TSP. Tanks using NOC should have a recirculating pump system and filter as specified in 4.2.1.9. The tank shall have a generator frequency of at least 25 kHz and a generator power per radiated surface of at least 3 watts/in2. The power per radiated surface area can be determined by dividing the total generator power by the surface area of tank bottom or side where the generator transducers are
located. For example, a tank of dimensions 12 inches by 12 inches by 11 inches deep with a 600 watt transducer mounted on the bottom has a power of 4.2 watts/in2, or
A parts washer of sufficient size to completely contain the component being cleaned. The parts washer shall completely immerse the component in the cleaning agent and shall direct
cleaning agent across or through the component at a fluid velocity of not less than 3 ft/sec. The parts washer shall be capable of being heated to 160oF for NOC or 180oF for TSP. Parts washers
using NOC should have a recirculating pump and filter selected as specified in 4.2.1.9.
(g)Equipment to dry clean parts.
(h)Equipment to perform the applicable analyses of 5.14. This
includes clean containers of no less than twice the sample volume
to obtain the required samples.
(i)Packaging material as specified in 5.16.1.
5.3.4 Preclean and rinse. Precleaning should be accomplished in a well ventilated area as follows:
(a)Each component shall be precleaned using a compatible precleaner and then rinsed with water until all visible soil, particulate,
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