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)

20 September 1996

5.10.1.2 That portion of the system to be entered shall be isolated with appropriate boundary isolation valves and depressurized. Discharge of any fluid shall be in accordance with the appropriate safety precautions of NAVSEA

S9086-SX-STM-010/CH-550.

5.10.1.3 Personnel clothing, including cleanroom gloves as specified in

5.1.6, class B, paragraph (c), or equal shall be worn whenever handling the wetted

surface of oxygen clean components. Oxygen clean component wetted surfaces

touched with bare hands shall be considered contaminated and shall be cleaned as

specified in 5.2 to re-establish oxygen cleanliness.

5.10.1.4 Systems containing oxygen at levels greater than 22 percent or hydrogen at levels greater than 3 percent shall be purged with helium or nitrogen to eliminate fire or explosion hazards using one of the following procedures:

(a) Where the configuration allows a purge path, the affected can be purged with helium or nitrogen until the effluent purge gas measures not greater than 22 percent oxygen or 3 percent hydrogen. The measurement shall be taken using suitable colormetric gas detector tubes such as those manufactured by Draeger Manufacturing Company or a portable analyzer or other equivalent means.

(b) Where the configuration does not allow a purge path such as a flask, or gas sampling equipment to measure oxygen or hydrogen is not available, verify the affected area is depressurized, then

pressurize to about 100 lb/in2

with helium or nitrogen, and then

depressurize the affected area. Repeat the cycle one additional time for oxygen or oxygen enriched systems for a total of two pressurization-depressurization cycles. For hydrogen systems, the pressurization-depressurization cycle shall be performed two additional times for a total of three times. Sampling to measure oxygen or hydrogen concentration is not required.

5.10.1.5 Only certified oxygen clean items, including replacement pipe, components, and tools, shall be installed or come in contact with the wetted surface of an oxygen clean system or component. Oxygen clean items removed for transportation shall be immediately packaged as specified in 5.16. If cleanliness is lost because of torn packaging, maintenance, or repair, the effected item shall be cleaned as specified in 5.2 to re-establish oxygen cleanliness.

5.10.1.6 Socket and seal welding in accordance with MIL-STD-278, or equal, are considered clean processes that do not result in loss of oxygen cleanliness provided that a purge as specified in 5.10.2 is maintained. Any other welding or brazing processes result in a loss of oxygen cleanliness that requires recleaning as specified in 5.5 or 5.8.

5.10.1.7 Establish the containment or purge requirements as specified in table IX. When a system is opened to remove an item, perform a visual inspection as specified in 5.13.1. Any visible contamination of the wetted surfaces shall be locally cleaned as specified in 5.12.4. Complete the necessary maintenance and repair. Prior to closing the system, repeat the visual inspection as specified in

5.13.1 for visual contamination. Any evidence of visible contamination may be an indication that loss of cleanliness has occurred and additional inspections as specified in 5.12 shall be accomplished.

5.10.1.8 If there is an unscheduled delay whatsoever, such as the wrong material, an incorrect part, or contamination, between the time that the system is opened and the time that the replacement component is installed, the open portions of the system shall be packaged as specified in 5.16.1.3. When the system is reopened, perform a visual inspection as specified in 5.13.1. Any evidence of visible contamination may be an indication that loss of cleanliness has occurred and additional inspections as specified in 5.12 may be required.

5.10.2 Purge. When the system is open, a slight positive purge of about

2 lb/in2

helium or nitrogen shall be maintained within the system to prevent

possible entry of airborne contamination.