MIL-STD-1622B(SH)
used. Appropriate precautions shall be taken to prevent damaging piping and equipment.
(b)The recommended drying method is using air or nitrogen at low flow rates. This allows the gas to evaporate the moisture. Higher flow rates are suitable for removing visible moisture. If it is
suspected that pockets of water exist at low points in the system, a high-volume blow down can be employed. The pressure should be
no greater than 100 lb/in2 or maximum operating pressure, whichever is less.
(c)While maintaining cleanliness as specified in 5.11, all items shall be removed which were installed in 5.9.2. A visual inspection of each cavity shall be performed. If the visual inspection fails, locally clean as specified in 5.13.4. While maintaining cleanliness as specified in 5.11, components cleaned as specified in 5.2 shall be installed.
(d)The system shall be reassembled or packaged as specified in 5.16.1 to maintain cleanliness.
(e)Test, charge with system fluid, and return to operational conditions.
5.10 Testing.
5.10.1 Pressure testing. Piping and components defined by the boundaries of 1.2 shall be pressure tested (hydrostatic, joint tightness, seat tightness, and pressure drop) as specified in NAVSEA 0902-018-2010, NAVSEA S9086-RD-STM-010/CH-505, NAVSEA S9086-SY-STM-010/CH-551. Flexible hoses shall be tested as specified in NAVSEA S6430-AE-TED-010. When contractually
invoked, or otherwise specified by NAVSEA, the test requirements of NAVSEA SS800-AG-MAN-010/P-9290 shall take precedence.
5.10.2 Operational testing. Repairs, modification, or installation of new piping and components which affect the operation of the system or component require operational testing prior to manned use. Open ended piping requires an operational test to prove unobstructed flow.
5.10.3 Gas sampling and analysis. For diver air and emergency air breathing systems, a gas sample is required if work was accomplished that could introduce gaseous contaminants, such as solvents, into a component or system. 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 no less than 8 hours.
(b)Obtain a gas sample from the component or system.
(c)While obtaining the sample, prevent contamination of the gas sample
with the ambient atmosphere and pressurize and vent the gas sample
flask sufficiently to obtain a representative sample.
(d)Analysis of the gas sample for diver air systems shall meet the
requirements of NAVSEA SS800-AG-MAN-010/P-9290 or NAVSEA SS521-AA-
MAN-010 and emergency air breathing shall meet the quality
requirements for BB-A-1034.
5.11 Removal and replacement of components. Maintain cleanliness during repair or maintenance of a clean system by preventing the entry of foreign material. This shall be accomplished by plugging or capping openings using methods as specified in 5.16.3. Prevent airborne contamination near
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