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

4. GENERAL REQUIREMENTS

4.1 Oxygen safety precautions. Personnel involved with cleaning and testing systems defined in 1.2 shall be qualified as specified in 5.14. They shall also

be familiar with the applicable safety precautions for cleaning and testing fluids as specified herein before conducting any work. The removal of organic and particulate contamination from oxygen and oxygen enriched systems is absolutely necessary to prevent a fire hazard. Failure to thoroughly clean oxygen systems

has resulted in catastrophic fires. Additionally, failure to use approved

cleaners has resulted in the introduction of flammable and toxic contaminants that

have resulted in personnel injury. While working with oxygen clean systems the

safety precautions in accordance with NAVSEA S9086-SX-STM-010/CH-550 shall be

observed.

4.2 Water.

4.2.1 Applicability. Three grades of water, A, B, and C, in descending order of purity, are associated with preparing and diluting cleaning solutions, flushing, rinsing, and testing, and are defined in table I. Water purity requirements specified throughout this standard are minimum requirements and do not preclude the use of water of greater purity.

TABLE I. Grades of water.

Item	Grade
Item	A 1/	B 1/	C 2/
Chloride ion, maximum, ppm	0.1	1.0	35
Conductivity, maximum, micromhos/cm 3/	2.5	20	550
Resistivity, minimum, ohms-cm 3/	400K	50K	1.8K
pH range 4/	6.0 to 8.0	-	-
Visual clarity	No turbidity, oil, or sediment

1/ Demineralized water meeting the requirements of ASTM D 1193, type II, satisfies grade A or B requirements.

2/ Potable water and municipal water generally meet grade C requirements.

3/ Measure either conductivity or resistivity; resistivity is the inverse of

conductivity.

4/ When the conductivity of grade A water is 0.25 micromhos/cm or less, pH

measurements are not required.

4.2.2 Disposal. Disposal of water shall be in accordance with local, state, and federal regulations.

4.2.3 Compatibility. Appendix A gives the compatibility of hot water with various materials. Where incompatibility exists, process changes such as rinsing with cooler water, shorter rinse durations, or immediate drying of wet surfaces may need to be considered. Where specific information is lacking, perform compatibility testing as specified in A.3.1 of appendix A.

4.3 Aqueous cleaning solutions.

4.3.1 Navy oxygen cleaner (NOC).

4.3.1.1 Applicability. NOC is an aqueous alkaline cleaning solution approved for use as a pre-cleaner or final cleaner for all compatible piping and components other than liquid oxygen generating plants. It may be used for liquid oxygen generating plant piping and components provided the aqueous cleaning process specified herein can be successfully accomplished. NOC shall be in accordance with MIL-DTL-24800.