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)

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m. Halogenated solvents used in contact with Diver Life Support Systems shall be completely drained and placed in an oven or heated to ensure all solvent is volatilized and removed before assembly, test, and operation. Air samples as specified in 5.9.3 are required to confirm removal of all solvent.

4.4.1.3 Disposal. Disposal of NAVSEA approved halogenated solvents shall be in accordance with local, state, and federal regulations. Used or contaminated halogenated solvent should be reclaimed for use by distillation or other appropriate method and inspected as specified in applicable specifications (see 6.3).

4.4.1.4 Compatibility. Appendix E gives the compatibility of NAVSEA approved halogenated solvents with various non-metallic materials. Where specific information with respect to compatibility is lacking, perform compatibility testing as specified in A.3.1 of Appendix A.

4.4.1.5 Use of NAVSEA approved halogenated solvents. Follow the instructions provided by the vendor and as directed herein.

4.4.1.6 Water previously used in systems. Many halogenated solvents will react with water forming corrosive acids. Systems previously known or believed to contain water or aqueous cleaning solutions shall be purged with nitrogen as specified in 4.7.3. An outlet dew point of minus 40 °F shall be obtained prior to introducing a halogenated solvent.

4.4.2 Isopropyl alcohol.

4.4.2.1 Applicability. Isopropyl alcohol (IPA) is an approved cleaning solvent for use only as a pre-cleaner for compatible materials. IPA shall not be used as a pre-cleaner for Teflon which will be wetted by an oxygen-enriched fluid. IPA should be in accordance with TT-I-735 or equal. IPA is soluble in water and commercial grades can have as much as 30 percent water.

4.4.2.2 Safety precautions. Follow the safety precautions recommended in the vendor's material safety data sheet and the following:

a. IPA is a volatile hydrocarbon solvent with a boiling point of about 180 °F. IPA is extremely flammable having a flash point of 56 °F. IPA vapors are toxic having a recommended 8-hour time weighted average exposure criteria of 400 ppm. Ingestion of IPA will cause burning of the gastrointestinal tract, nausea, vomiting, bleeding, central nervous system (CNS) depression, hemolysis, and pulmonary damage. Ingestion of as little as 10 mL may cause serious injury, while ingestion of 240 mL can be fatal.

b. An industrial hygienist, gas-free engineer, gas-free person, or other designated individual shall verify that ventilation in the space is adequate to keep the concentration of the solvent below the recommended exposure criteria during anticipated operations, excluding accidents or spills. Use caution when ventilating IPA vapors since the vapors are flammable. Explosion-proof equipment may be necessary.

c. IPA is absorbed by non-metallic material, such as Teflon, and unless carefully dried may off-gas flammable and toxic material. Commercial grades of IPA, including TT-I-735, will leave a residue that may be flammable in

an oxygen enriched atmosphere.

d. In the event any adverse health effects are experienced, cease operations involving IPA and consult the cognizant medical department representative for additional guidance.

4.4.2.3 Disposal. Disposal of isopropyl alcohol shall be in accordance with local, state, and federal regulations.

4.4.2.4 Compatibility. Where specific information with respect to compatibility is lacking, perform compatibility testing as specified in A.3.1 of Appendix A.

4.5 Other cleaners.

4.5.1 Other pre-cleaners. Any compatible aqueous cleaning solution or cleaning solvent may be used as a pre- cleaner with local engineering and environmental approval. Directions for use, safety precautions, disposal, and compatibility are the responsibility of the approving activity. For all Naval activities, review by the cognizant medical department or industrial hygienist shall be obtained prior to locally approving the use of any aqueous cleaning solution or cleaning solvent other than those specified in 4.3 or 4.4.