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

g. If any analysis fails, replace the cleaning solution and repeat the final system flush. Do not wait for the results of 5.13.2 before proceeding to rinsing as specified in 5.5.9.

TABLE III. Applicability matrix for flush duration and back flush. 1/

Configuration	Flush duration	Back flush
System contains socket welds, fittings, or components with expansions or contractions	Not less than 60 minutes	Not less than an additional 60 minutes
System contains only bends and elbows and no socket welds, fittings, or components with expansions or contractions	Not less than 30 minutes	Not required
Any configuration with all sections of piping fabricated from pre- cleaned piping and components	Not less than 30 minutes	Not less than an additional 30 minutes
NOTE: 1/ Regardless of the configuration, the back flush can be deleted if all of the following conditions are met: (a) It is authorized by local engineering. (b) All pipe sections have been pre-cleaned. (c) All valve bodies, filter housings, and other large component housings shall have been cleaned to oxygen cleanliness requirements. (d) Prior to the flush, all cartridges, filter elements, regulators, and other components shall be removed and flush plugs or bypass lines installed. After the flush, all cavities shall be visually inspected as specified in 5.13.1. Any evidence of contamination shall be removed by either local cleaning with NOC or TSP or additional flushing. The results of the visual inspection shall be recorded. (e) For oxygen enriched systems only, the system piping and components shall be fabricated from material that will not propagate a flame at maximum operating pressure when determined in accordance ASTM G94. For information, brass, bronze, copper, copper-nickel, nickel-aluminum-bronze, and nickel-copper (monel) will not propagate a flame in an oxygen or oxygen enriched atmosphere at pressures up to 7500 lb/in2.

5.5.9 Rinsing and particulate flushing. Rinsing and particulate flushing shall be accomplished as follows:

a. Remove the majority of NOC with nitrogen and collect for future use, or proceed to 5.5.9(b). When using nitrogen, do not allow NOC to dry before proceeding to 5.5.9(b).

b. Remove cleaning solution by rinsing the system once-through with Grade B water at a velocity of not less than 3 ft/sec. Return filters that were used during the flush step should be removed, replaced, or bypassed prior to rinsing to prevent contamination trapped by the filter from being introduced into the system. The water temperature shall be not less than 110 °F for NOC and 160 °F for TSP. Systems flushed with large in-line volumes, such as moisture separators, where the flushing velocity is less than 3 ft/sec shall be back flushed with rinse water to ensure all cleaning agent is removed.

c. Obtain a sample of the rinse effluent and measure the pH as specified in 5.13.4.2. When the effluent pH is not greater than 8.0, outlets shall be opened one at a time to help clean valve bodies and other probable pocketing areas. The rinse water shall then be recirculated until the pH of the effluent at each branch, vent, or drain is not greater than 8.0.

d. At the completion of rinsing, obtain a sample of the rinse effluent from each branch and verify particulate cleanliness as specified in 5.13.3. If any of the samples do not pass the required inspection, recirculate Grade B water through the system at a velocity of not less than 3 ft/sec for not less than 30 minutes. The water temperature does not need to be elevated. Filters should be installed to trap particulate. Continue flushing until a sample of the effluent from each branch passes the particulate cleanliness as specified in 5.13.3.