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

TABLE IX. Containment and purge requirements.

Conditions

Purge 1/

Controlled area 2/

Airborne contamination 3/ is being produced such as a ship in an overhaul. A controlled area can be established which will prevent entry of contamination into an opened system.

Yes

Airborne contamination 3/ is being produced such as a ship in an overhaul. A controlled area alone is not adequate to establish oxygen clean conditions.

Yes

Airborne contamination is not being produced such as a ship at sea or a clean chamber.

Yes

Airborne contamination is not being produced such as a ship at sea or a clean chamber. Additionally, the item being removed falls into one of the following categories: 4/

(a) A charging connection.

(b) A test connection or instrument being removed for instrument calibration.

(d) Removal of fittings or components to connect a purge source to a system.

1/ Purges shall be established as specified in 5.10.2. A purge is always required, regardless of the conditions, if socket or seal welding

in accordance with MIL-STD-278, or equal, is being performed

and cleanliness is being maintained. Additionally, a purge is always

required if the ambient environment may introduce an unwanted contaminant.

Examples of unwanted ambient environmental contaminants include air

contamination of a helium life support system or moisture contamination of a

liquid oxygen system.

2/ A controlled area as specified in 5.1 shall be constructed around the

component to be removed.

3/ Airborne contamination includes operation of gasoline or diesel fueled

equipment, and evolutions such as grinding, painting, and brazing.

4/ On a case basis, local engineering can authorize no purge and no controlled

area for items outside of these categories. Items such as flame propagation

and damage to delicate components from particulate contamination shall be

considered. ASTM G 63 and ASTM G 94 provide guidance for evaluating

materials for oxygen service which can be used to assess the probability

of flame propagation.

5.10.1.1 The component being removed and adjacent piping and equipment shall be externally cleaned with an aqueous cleaner or NAVSEA approved halogenated

solvent1

to remove loose scale, dust, dirt, and other foreign material.

Ultraviolet and white light inspections as specified in 5.13.1.2 and 5.13.1.3 shall indicate no visible contamination.

1For critical applications, NAVSEA approved halogenated solvents may be used for external cleaning with local engineering approval.