MIL-STD-1330D(SH)
w/ Change 1
b. Obtain a gas sample from the component or system.
c. While obtaining the sample, prevent contamination of the gas sample with the ambient atmosphere and pressurize and vent the gas sample flask sufficiently to obtain a representative sample.
d. Analysis of the gas sample shall meet the requirements of NAVSEA SS800-AG-MAN-010/P-9290 or
NAVSEA SS521-AA-MAN-010.
5.10 Removal and replacement of components in oxygen clean systems.
5.10.1 General requirements. To maintain cleanliness during repair or maintenance of an oxygen clean system, the following general requirements apply. Containment and purge requirements shall be as specified in Table IX and, as applicable, 5.10.2. For nitrogen-oxygen life support systems wetted by not greater than 50 percent by
volume oxygen and demineralized water systems, maintain cleanliness during repair or maintenance in accordance with MIL-STD-1622, except paragraph 5.17 of this standard applies for "maintenance of cleanliness".
TABLE IX. Containment and purge requirements.
Conditions |
Purge 1/ |
Controlled area 2/ |
Airborne contamination 3/ is being produced such as a ship in an overhaul. A controlled area can be established which will prevent entry of contamination into an opened system. |
No |
Yes |
Airborne contamination 3/ is being produced such as a ship in an overhaul. A controlled area alone is not adequate to establish oxygen clean conditions. |
Yes |
Yes |
Airborne contamination is not being produced such as a ship at sea or a clean chamber. |
Yes |
No |
No |
Yes |
|
Airborne contamination is not being produced such as a ship at sea or a clean chamber. Additionally, the item being removed falls into one of the following categories: 4/ (a) A charging connection. (b) A test connection or instrument being removed for instrument calibration. (c) Routine replacement of flasks in accordance with detailed procedures. (d) Removal of fittings or components to connect a purge source to a system. |
No |
No |
NOTES: 1/ Purges shall be established as specified in 5.10.2. A purge is always required, regardless of the conditions, if socket or seal welding in accordance with NAVSEA S9074-AR-GIB-010/278, or equal, is being performed and cleanliness is being maintained. Additionally, a purge is always required if the ambient environment may introduce an unwanted contaminant. Examples of unwanted ambient environmental contaminants include air contamination of a helium life support system or moisture contamination of a liquid oxygen system. 2/ A controlled area as specified in 5.1 shall be constructed around the component to be removed. 3/ Airborne contamination includes operation of gasoline or diesel fueled equipment, and evolutions such as grinding, painting, and brazing. 4/ On a case basis, local engineering can authorize no purge and no controlled area for items outside of these categories. Items such as flame propagation and damage to delicate components from particulate contamination shall be considered. ASTM G63 and ASTM G94 provide guidance for evaluating materials for oxygen service which can be used to assess the probability of flame propagation. |
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