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)

w/ Change 1

TABLE VII. Seat tightness testing.

Attribute	Requirement
Applicability	New or repaired valves and regulators shall be seat tightness tested. Repairs are any work/rework which could affect the ability of the valve or regulator to remain seat tight such as machining of the seat area or replacement of the seat.
When accomplished	Seat tightness testing is normally accomplished after component cleaning or final system flushing and prior to operational testing.
Test fluid	The test fluid is as specified in 4.6 or 4.7.
Test pressure	The test pressure is 100 percent of system maximum operating pressure.
Test duration	Shop testing shall be for not less than 5 minutes. Testing conducted in the as-installed configuration shall be the time necessary for the minimum leakage to be detected at the point of observation or monitoring.
Acceptance criteria	Pressure shall be applied in the direction tending to unseat globe or needle valves, in the check direction for check valves, and in pressure holding direction for ball valves. Testing with nitrogen or water: Leakage shall be zero or as specified by the applicable military or manufacturer specification. Testing with helium: The maximum allowable leakage rate is 0.6 sccm or as specified by the applicable military or manufacturer specification.

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.