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) APPENDIX B

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B.9.13  Weigh the filter to the nearest 0.1 mg; preferably to the nearest 0.05 mg. B.10  Calculations.

B.10.1  Calculate the baseline (before use) NVR in NOC by subtracting the initial weight of the filter (step B.9.2) from the final weight of the filter (step B.9.13) after filtering new-unused NOC.  Record the weight difference in mg.  Multiply the weight difference by five, and record as baseline (before use) mg/L NVR in NOC.

B.10.1.1  Perform a baseline analysis for each lot or batch of NOC.  The term lot or batch refers to the manufacturing lot or batch numbers identified on each container of NOC.  Where multiple containers have the same lot or batch number, only one container needs to be sampled.  For cleaning applications using multiple containers with different lot or batch numbers, either the average of the different baselines or the lowest of the different baselines shall be used when determining final NVR in NOC.

B.10.1.2  When determining baseline NVR in new-unused NOC, step B.9.4 may be deleted, and unhomogenized NOC may be used in step B.9.7.

B.10.2  Calculate the post-cleaning (after use) parts per million (ppm) above baseline NVR in NOC as follows: B.10.2.1  Subtract the initial weight of the filter (step B.9.2) from the final weight of the filter (step B.9.13) after

filtering used NOC.  Record the weight difference in mg.  Multiply the weight difference by five, and record as

post-cleaning (after use) mg/L total NVR in NOC.

B.10.2.2  Subtract the baseline (before use) NVR (from stepB.10.1) from the post-cleaning (after use) total

NVR (from step B.10.2.1).  Record the difference as post-cleaning (after use) mg/L above baseline NVR in NOC.

B.10.2.3  Convert mg/L to ppm by dividing mg/L (from step B.10.2.2) by 1.075 (the average density of NOC in use) and record as ppm above baseline NVR in NOC.

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