MIL-STD-1622 Cleaning Of Shipboard Compressed Air SystemsThis standard provides the requirements for cleaning of compressed air systems and components.

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MIL-STD-1622B(SH)

5.14.1 Visual surface inspection methods.

5.14.1.1 Applicability. When specified, surface cleanliness shall be verified using the visual inspection techniques specified in Table VIII. Ultraviolet light inspections shall be performed as specified in 5.14.1.2; white light inspections shall be performed as specified in 5.14.1.3, and swipe inspections shall be performed as specified in 5.14.1.4. These visual inspection techniques are limited only to determining the presence of organic or particulate contamination on a surface cleaned in accordance with this standard. For critical applications, visual inspection techniques shall not

be used in place of cleaning or to establish the absence of organic contamination on surfaces not cleaned as specified in this standard. Be aware that, for other than critical applications, the acceptance criteria of Table VIII is intended to minimize fire hazards and major equipment failures. Use

of components with very close tolerances may require critical application cleanliness to avoid accelerated equipment degradation.

5.14.1.2 Ultraviolet light method. The surface shall be inspected with an ultraviolet light having a wave length of 3600 to 3900 angstroms. The inspection shall be performed by a person with normal visual acuity, natural

or corrected. The inspection criteria are as specified in Table VIII. Note that most oils and greases do not fluoresce, while some non-metallic substrates may fluoresce leading to possible false negative or false positive results.

5.14.1.3 Bright white light method. The surface shall be inspected with a bright white light of at least 100 foot-candles. The inspection shall be performed by a person with normal visual acuity, natural or corrected. A general purpose two D-cell flashlight, in good condition, at a distance of no greater than 18 inches from the surface being inspected will illuminate the surface with an intensity of not less than 100 foot-candles. The inspection criteria are as specified in Table VIII.

5.14.1.4 Swipe method. The surface shall be swiped with at least two movements with filter paper or a clean swipe cloth as specified in 3.7. The inspection criteria are as specified in Table VIII. Note that the swipe method is limited to surfaces with areas not less than 100 cm2 (16 in2).