MIL-STD-1330D standard

What is MIL-STD-1330D?

MIL-STD-1330D is a U.S. military standard that outlines the approved cleaning and purification procedures for oxygen, helium, helium–oxygen mixtures, nitrogen, and hydrogen systems used aboard naval ships and submarines.

Key Features of the MIL-STD-1330D Standard

Defined Scope for Life-Support Gas Systems

The standard applies to all components that come into contact with oxygen or oxygen-enriched gas mixtures containing more than 25% oxygen by volume. This includes oxygen, helium, nitrogen, and hydrogen delivery systems-extending to primary check valves, pipelines, and associated valves.

Strict Requirements for Approved Cleaning Agents

Only NAVSEA-authorized cleaning substances, such as Navy Oxygen Cleaner (NOC) or Tribasic Sodium Phosphate (TSP), may be used. Any substitution or deviation from these agents requires formal written approval from NAVSEA.

Mandatory Post-Cleaning Inspection

Following cleaning, all systems must undergo visual inspection or other approved testing methods to verify complete removal of contaminants such as grease, dust, and debris. If contamination remains, the components must be re-cleaned until they meet specification.

Top Products Compliant with MIL-STD-1330D

TOP	Product Name	Product photo	Product Description
1	KRYTOX GPL 226		Krytox GPL 226 is a synthetic fluorinated grease, based on perfluoropolyether (PFPE) oil.
2	Krytox GPL 103		Krytox GPL 103 is not only resistant to oxygen, but they are also inert to virtually all chemicals used in many industries.
3	Krytox GPL 101		Krytox GPL 101 Oil is an oxygen resistant oil that is inert to virtually all chemicals used in many industries.

Applications of the MIL-STD-1330D Standard

Ensuring Safety in Life-Support Gas Systems

Adherence to MIL-STD-1330D is vital for keeping oxygen, helium, helium–oxygen, nitrogen, and hydrogen systems free from contamination-mitigating risks of fire, explosion, and equipment failure, and safeguarding crew safety.

Critical for Ship Maintenance and Overhaul

The standard must be followed during all system maintenance, repairs, or pre-commissioning inspections. Any lapse in cleaning procedures can compromise safety and potentially damage sensitive equipment.

Enhancing Operational Reliability and Compliance

By enforcing stringent protocols and requiring official approval for any procedural deviations, MIL-STD-1330D improves system reliability, facilitates quality control inspections, and ensures all processes meet naval standards.