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)

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e.    Any residual NOC or TSP in the cavities should be removed prior to drying.  Remove flush plugs and inspect for residual NOC or TSP.  Remove all visible traces of NOC or TSP by wearing cleanroom gloves and wiping each cavity and flush plug with a clean lint- free cloth wetted with Grade B water at a temperature of 100 to

120 °F.  The flush plugs should be reinstalled prior to drying with nitrogen.

5.5.10  Drying and reinstalling components.  Drying and reinstallation of components shall be accomplished as follows:

a.    Remove rinse water and dry the system with nitrogen until a minus 40 °F dew point is reached.  For systems which operate at elevated humidity, such as electrolytic oxygen generator systems, or in the absence of an elevated dryness requirement, a dew point of plus 20 °F is acceptable.  Nitrogen preheaters, strip heaters, or vacuum pumps have been successfully used.  Appropriate precautions shall be taken to prevent damaging piping and equipment.

b.    The recommended drying method is using nitrogen at low flow rates.  This allows the gas to evaporate the moisture.  Higher flow rates are suitable for removing visible moisture.  If it is suspected that pockets of water exist at low points in the system, a high-volume blow-down can be employed.  The pressure should be not greater than

100 lb/in2  or maximum operating pressure, whichever is less.

c.    While maintaining cleanliness as specified in 5.10, all items shall be removed which were installed in

5.5.3.2.  A visual inspection of each cavity shall be performed as specified in 5.13.1.  Additionally, where applicable, open and visually inspect all large volumes as specified in 5.13.1.  If the visual inspection fails, locally clean as specified in 5.12.4.  While maintaining cleanliness as specified in 5.10, components cleaned as specified in

5.2 shall be installed:

d.    The system shall be reassembled and pressurized with nitrogen or helium to maintain not less than 10 lb/in2, or packaged as specified in 5.16 to maintain cleanliness.  If the pressure should drop below 10 lb/in2, the responsible authority shall investigate the circumstances associated with the pressure drop to ensure that no contamination could have entered the system which would require repeating the flush.

e.    Test, charge with system fluid, and return to operational conditions.

5.6  Potassium hydroxide (KOH) inspection.

5.6.1  Applicability.  This inspection applies only if the system has an electrolytic oxygen gas generator that uses KOH.  The oxygen system shall be visually inspected for KOH contamination at mechanical joints before the system is flushed as specified in 5.5.5 through 5.5.9.  KOH is a whitish solid that may occur as a scale on the inside of pipes and components.

5.6.2  Inspection.  The inspection for KOH contamination shall be accomplished as follows:

a.    The oxygen generator union connection shall be considered the first mechanical joint downstream of the moisture separator.  The piping to the oxygen generator union connection shall be examined for KOH contamination.  If no KOH is found, no further inspection shall be required.  If contamination is found, perform the inspection as specified in 5.6.2(b).

b.    If KOH is found in the oxygen generator union connection as identified in 5.6.2(a), downstream piping to the isolation valves in the distribution header shall be visually inspected.  If no KOH is found in this section, no further inspection is required and the KOH shall be removed as specified in 5.6.3.  If KOH is found in this section, the remainder of the system shall be visually inspected as specified in 5.6.2(c).

c.    If KOH is found in the distribution header as identified in 5.6.2(b), the remainder of the system shall be visually inspected.  The KOH shall be removed as specified in 5.6.3.

5.6.3  KOH removal.  KOH shall be removed by flushing with Grade B water at a temperature of 120 to 140 °F. Flush until the conductivity of the effluent is within 2 micromhos of the influent, or the pH measured as specified in

5.13.4.2 is 8.0 or less.  Dry as specified in 5.5.10.

5.7  Flushing of ships service demineralized water piping systems.

5.7.1  Applicability.  This process applies to ships service demineralized water piping systems as defined in

1.2.2.4.

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