MIL-STD-1330 Precision Cleaning And Testing Of Shipboard Oxygen, Helium, Helium-Oxygen, Nitrogen, And Hydrogen SystemsThis standard provides the requirements for precision cleaning and testing of oxygen or oxygen-enriched systems and components; oxygen generating plants including nitrogen, hydrogen, and demineralized water support systems and components; and helium, helium-oxygen, and hydrogen life support systems and components. Each activity will implement the applicable requirements of this document through a locally prepared and approved procedure. Activities subject to additional quality assurance requirements such as NAVSEA SS800-AG-MAN-010/P-9290 or NAVSEA SS521-AA-MAN-010 will obtain procedure approval from the applicable certifying activity.

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MIL-STD-1330D(SH)

w/ Change 1

b. Clearly defined pieces such as elastomers likely caused by system degradation.

c. Visible particles attributed to several causes such as exposure to an uncontrolled atmosphere, inadequately filtered purge gas, or corrosion of nearby components. If possible, particles should be collected and analyzed in order to determine the source.

5.12.3 Corrective action. Contaminated systems shall be evaluated by local engineering for the need to reclean. Consideration should be given to items such as the application, configuration, and potential hazards posed by the contamination. For instance, particulate is expected and considered acceptable in a closed loop life support system with scrubbers; however, any contamination in a high pressure oxygen system with aluminum piping or components poses a serious hazard. Particulate contamination or organic contamination identified as an approved lubricant should be removed by local cleaning as specified in 5.12.4. However, evidence of hydrocarbon contamination requires recleaning to the requirements of this standard. Loss of system cleanliness due to other than normal system use shall be noted (see 6.3) specifying corrective action.

5.12.4 Local cleaning. During performance of local cleaning, maintain system cleanliness as specified in 5.10. Clean cloths as specified in 3.6 shall be used for local cleaning. Wearing cleanroom gloves, wipe the contaminated surface with the clean cloth wetted with warm (100 to 120 °F) NOC or TSP solution as specified in 4.3 or, with local engineering approval, a NAVSEA approved halogenated solvent. After use of NOC or TSP solution, wipe the cleaned surface with a new clean cloth wetted with warm (100 to 120 °F) Grade B water to remove cleaner residue. This process shall be repeated until the parts pass the visual inspection as specified in 5.13.1. Dry the wetted

surfaces with a new clean cloth. If necessary, use nitrogen to dry the surface.

5.13 Process verification methods.

5.13.1 Visual surface inspection methods.

5.13.1.1 Applicability. When specified, verification of surface cleanliness by visual inspection shall be performed using ultraviolet light as specified in 5.13.1.2, bright white light as specified in 5.13.1.3, and for surfaces with areas not less than 16 square inches (in2) (100 cm2), swipe as specified in 5.13.1.4. Visual inspection techniques as specified in 5.13.1.2 through 5.13.1.4 are limited only to determining the presence of organic or particulate contamination on a surface cleaned in accordance with this standard. Visual inspection techniques shall not be used in place of cleaning or to establish the absence of contamination on a surface not cleaned as specified in this standard.

5.13.1.2 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. Any evidence of fluorescence from oil, grease, ink, dye, particulate, or fibers on the surface being inspected shall be cause for rejection, unless otherwise specified. 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.

5.13.1.3 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. Any evidence of oil, grease, ink, dye, particulate, or fibers on the surface being inspected shall be cause for rejection, unless otherwise specified.

5.13.1.4 Swipe method. The surface shall be swiped with at least two movements with filter paper or a clean swipe cloth as specified in 3.6. Any evidence of oil, grease, ink, dye, particulate, or fibers shall be cause for rejection. Note that the swipe method is limited to surfaces with areas no less than 16 in2 (100 cm2).