MIL-STD-419 Cleaning, Protecting, And Testing Piping, Tubing, And Fittings For Hydraulic Power Transmission EquipmentThis standard covers the requirements governing the basic methods of cleaning and protecting nonferrous and ferrous metal and alloyed pipe, tubing, and fittings prior to installation and after hydraulic tests in hydraulic power transmission applications. This standard is applicable to hydraulic components used in systems filled with either petroleum oil, synthetic poly-alpha-olephin PAO fluid, phosphate ester type fluid, or water based fluid.

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MIL-STD-419E

5.5.1.2  Components.....................................................................................................................................7

5.5.1.2.1  Short term (internal surfaces) .................................................................................................7

5.5.1.2.2  Long term (internal surfaces) .................................................................................................8

5.5.1.2.3  External surfaces.....................................................................................................................8

5.5.1.3  Preservative removal .......................................................................................................................8

5.6  System flushing.................................................................................................................................................8

5.6.1  Procedure for system operating fluid flush ............................................................................................11

5.6.1.1  Minimum flushing time .................................................................................................................11

5.6.2  Flushing fluid samples ...........................................................................................................................11

5.6.2.1  Sample analyses.............................................................................................................................12

5.7  Capping and sealing open ends.......................................................................................................................12

5.7.1  Petroleum or PAO based hydraulic fluid caps........................................................................................12

5.7.2  Phosphate ester based hydraulic fluid caps. ...........................................................................................12

5.8  Ferrous systems (except corrosion-resistant steel) .........................................................................................12

5.9  Disposal of waste materials used in cleaning..................................................................................................12

6.  NOTES ...................................................................................................................................................................12

6.1  Acquisition requirements ................................................................................................................................12

6.2  Subject term (key word) listing.......................................................................................................................13

6.3  Changes from previous issue ..........................................................................................................................13

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