MIL-STD-1330-SUP-2 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) APPENDIX B

20 September 1996

(m) Petri dishes, quantity 2, which are covered, glass and 50 millimeter minimum diameter for drying membrane filters in the oven.

(n) Forceps with non-serrated tips to handle filters.

(o) An eye dropper or pipette to transfer isopropyl alcohol to wet the

membrane filter prior to filtration.

(p) Teflon tape to prepare threaded connections on the filtration

reservoir.

(q) If using a vacuum to draw the NOC through the membrane filter, a

vacuum source capable of drawing a vacuum equivalent to 10 inches

Hg (5 lb/in2

differential) and controllable at 2 inches Hg (1

lb/in2) increments. Sources of vacuum include traditional electric vacuum pumps; gas vacuum ejector pumps available from Cole-Parmer, and inexpensive water aspirator/ejector vacuum pumps such as Nalgene Part No. 6140-0010.

(r) If using pressure to push the NOC through the membrane filter, an oil-free air or nitrogen pressure source capable of providing 5

lb/in2

B.6 Reagents.

and controllable at 1 lb/in2

increments.

(a) Navy oxygen cleaner (NOC) in accordance with MIL-DTL-24800.

(b) Demineralized water in accordance with ASTM D 1193 type II or 1

micrometer nominal filtered grade B as specified in 4.2.

having an NVR of 5 ppm (0.005 percent) or less which is available

from laboratory supply houses.

B.7 Samples.

(a) A 500 to 600 mL sample of new-unused NOC shall be collected from each container or drum of each lot or batch to establish a baseline NVR.

(b) A 500 to 600 mL NOC sample of the NOC effluent from the oxygen system or component being cleaned shall be collected for cleanliness verification.

B.8 Preparation and maintenance of apparatus.

B.8.1 Apparatus used in the procedure, including the sample bottles, homogenizer, homogenizing container, graduated cylinder, filtration reservoir, and demineralized water beaker shall have been cleaned as specified in 5.2.

B.8.2 Threaded connections in the filtration reservoir and filter support shall be wrapped with Teflon tape to prevent leakage of the NOC sample.

B.8.3 After contact with NOC, all apparatus shall immediately be rinsed with demineralized water to remove residual NOC to prevent formation of inorganic deposits and to maintain cleanliness.

B.9 Procedure.

B.9.1 Select a membrane filter that has equilibrated to ambient conditions. B.9.2 Using forceps, weigh the filter to the nearest 0.1 mg, preferably to

the nearest 0.05 mg.

B.9.3 Transfer the membrane filter to the filter holder and attach the filter holder to the filtration reservoir as shown on figure 3. DO NOT OVER TIGHTEN. Over tightening the threaded connections may cause permanent deformation allowing the NOC sample to leak.