MIL-STD-419E
5.6.2.1 Sample analyses. The test method for determination of particulate contamination shall be in accordance with SAE-ARP-598 or an automatic particle counter calibrated in accordance with ISO 11171. Directions in the manual for the respective instrument shall be followed. Water content shall be determined in accordance with
ASTM D6304, or with commercially available automatic water-analyzing equipment that shall accurately determine water content down to 0.01 percent.
5.7 Capping and sealing open ends. Open ends shall be capped or sealed to preserve cleanliness of assemblies for stowage, transit, or installation operations. Caps shall have the same grade of cleanliness as the pipe or assembly to be sealed. The use of electrical plastic tape or other compatible tape is allowed to hold caps in place. However, the use of any tape as a cap is prohibited. Caps shall be made in accordance with NAS 847.
5.7.1 Petroleum or PAO based hydraulic fluid caps. In systems using petroleum or PAO base hydraulic fluid, plastic or rubber material may be used for caps, with the exception of butyl or ethylene propylene rubber. All other incompatible rubbers shall be prohibited. The pipe end shall be completely covered with sheet plastic or rubber (except butyl) and secured to the pipe outside diameter (od) with electrical plastic tape or some other compatible tape. Nitrile rubber is recommended for caps. These materials may be used for threaded and unthreaded closures.
5.7.2 Phosphate ester based hydraulic fluid caps. In systems using phosphate ester type fire-resistant hydraulic fluid, butyl or other compatible rubber and compatible plastics may be used for caps. The pipe end shall be completely covered with compatible sheet plastic or butyl rubber, and secured to the pipe od with a compatible tape.
5.8 Ferrous systems (except corrosion-resistant steel). When specified by the command or agency concerned, ferrous piping, tubing, and fittings shall be phosphate coated, prior to installation, in accordance with the specified type and class of MIL-DTL-16232.
5.9 Disposal of waste materials used in cleaning. The following materials and solutions containing these materials shall not be discharged overboard. They shall be retained in containers and held for shore disposal:
a. Sodium chromate.
b. Sodium dichromate. c. Lubricating oil.
d. Cleaning oil.
e. Corrosion preventive, solvent cutback, cold application. f. Dry cleaning solvent.
g. Hydraulic fluids.
Other materials shall be disposed of in accordance with local, state, and Federal laws or retained in containers for shore disposal.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of the standard.
b. The required system cleanliness level (based on the cleanliness methods in accordance with SAE-AS4059 or ISO 4406) and the minimum flushing time, as necessary (see 5.6.e)
c. The maximum water content by volume for any single sample, as necessary (see 5.6.e). d. The maximum average water content by volume for all samples, as necessary (see 5.6.e)
e. Flushing fluid sample locations, as necessary (see 5.6.2)
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