Which standard is cited for an O2 clean publication?

• A. MILSTD 1331
• B. MILSTD 1320
• C. MILSTD 1330
• D. MILSTD 1280

Answer: (C)

Oxygen-clean requirements are all about removing every hydrocarbon and residue that could ignite in an oxygen-rich environment, and then proving that cleanliness through proper verification methods. Because of the heightened ignition risk in oxygen service, there are dedicated procedures that specify what cleaning agents can be used, how the parts must be cleaned, and how cleanliness must be verified before use.

MIL-STD-1330 is the standard that covers those exact needs for equipment intended to operate in oxygen service. It provides the guidelines for achieving and validating O2 cleanliness, including acceptable residue levels, cleaning processes, and verification methods. That precise scope is why this standard is the appropriate citation for an O2 clean publication.

The other standards listed are focused on different topics and do not address the specialized cleaning and verification requirements for oxygen service, so they aren’t suitable references for an O2-clean publication.