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 VIII. Pressure drop testing.

Attribute

Requirement

Applicability

New systems defined by 1.2.1 and 1.2.3 with storage capacity designed for greater than 24 hours duration shall be pressure drop tested. Joints defined by 1.2.1 and 1.2.3 subsequently disturbed or installed and inaccessible for joint tightness testing as specified in table VI shall

be pressure drop tested. The test boundary shall be from and including the storage flasks downstream to the last isolation valve.

When accomplished

Pressure drop testing is normally accomplished after joint and seat tightness testing and prior to operational testing. Drop and joint tightness testing may be performed concurrently.

Test fluid

The test fluid is as specified in 4.7.

Test pressure

The test pressure is 100 percent of system maximum operating pressure.

Test duration

The test duration is not less than 24 hours.

Acceptance criteria

The temperature corrected pressure drop shall not exceed 1.0 percent of the test pressure.

5.9.2 Operational testing. Repairs, modification, or installation of new piping and components which affect the operation of the system or components require operational testing prior to manned use. Open-ended piping requires an operational test to prove unobstructed flow.

5.9.3 Gas sampling and analysis. For critical applications and Diver Life Support Systems, a gas sample is required if work was accomplished that could introduce gaseous contaminants into a component or system such as cleaning with a solvent. For components with large volumes, such as flasks, the sample may be taken prior to or after installation, however, sampling prior to installation is recommended to prevent rework. The gas sample shall be taken and analyzed as follows:

(a) Isolate the pressurized component or portion of the system from the pressurized source. The recommended hold time is not less than 24 hours.

(b) Obtain a gas sample from the component or system.

with the ambient atmosphere and pressurize and vent the gas sample

flask sufficiently to obtain a representative sample.

(d) Analysis of the gas sample shall meet the requirements of NAVSEA

SSS00-AG-MAN-010/P-9290 or NAVSEA SS521-AA-MAN-010.

5.10 Removal and replacement of components in oxygen clean systems.

5.10.1 General requirements. To maintain cleanliness during repair or maintenance of an oxygen clean system, the following general requirements apply. Containment and purge requirements shall be as specified in table IX and, as applicable, 5.10.2.