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

or B. Nitrogen shall be filtered to 10 micrometers nominal or less. If residual nitrogen in a system will present a problem, it shall be purged with the appropriate gas as required.

4.7.4 Oxygen. Oxygen shall only be used in a system or component specifically designed and cleaned for oxygen service. When effected joints can be continuously monitored for leakage, oxygen may be used for tightness testing with local engineering approval. No other use of oxygen for tightness testing shall be permitted.

4.8 Cleaning silver-brazed piping. For systems with new silver-brazed joints, residual silver-brazing flux shall be prevented or removed by one of the following procedures:

(a) Systems cleaned with a NAVSEA approved halogenated solvent can either be brazed using the low flux procedure in accordance with NAVSEA S9086-CH-STM-010/CH-074, Volume 1, or the joint can be locally cleaned to remove the brazing flux. Halogenated solvents are not effective in removing brazing flux and systems cleaned with halogenated solvents can not be soaked or flushed with water to remove residual flux due to difficulties in drying the system.

(b) For systems that will be cleaned with a NOC or TSP aqueous oxygen cleaning process, residual brazing flux can be removed in accordance with NAVSEA 0900-LP-001-7000 prior to cleaning, or residual brazing flux can be removed with the aqueous oxygen cleaning process. In either case, the brazing flux shall be removed prior to the hydrostatic test. When using an aqueous oxygen cleaning process to remove brazing flux from copper tubing, NOC is preferred because it does not discolor copper like TSP.

(c) For systems that will be cleaned with water such as the boundary defined by 1.2.2.4, remove residual brazing flux in accordance with NAVSEA 0900-LP-001-7000, and then clean as specified herein.

4.9 Lubricants. Lubricants shall be oxygen compatible in accordance with NAVSEA S9086-H7-STM-010/CH-262 (see 6.3). During reassembly, lubricants shall be used sparingly. Direct contact of a lubricant with an oxygen or oxygen enriched atmosphere should be avoided. Excessive quantities of lubricant can trap particulate and other contaminants developing a potential fire hazard. Avoid the use of fluorinated lubricants with aluminum and magnesium under conditions of large shear such as threaded connections. Ignition of fluorinated lubricants has occurred in these applications.

5. DETAILED REQUIREMENTS

5.1 Facility requirements. Unless otherwise specified, the cleaning of components and assembling, testing, and packaging of components cleaned as specified in this standard shall be performed in a cleanroom. Other operations, including removal, replacement, and repair of piping and components cleaned as specified in this standard, shall be performed in either a cleanroom or controlled area unless otherwise specified in table IX. Cleanroom and controlled area requirements shall be as specified in table II and 5.1.1 through 5.1.7.