MIL-STD-419E
c. Cold soak the system for 12 hours using fresh water at a minimum temperature of 60 °F. At the completion of the 12-hour soak, systems shall be flushed with nonrecirculating fresh water at a minimum temperature of 60 °F for 4 hours.
Under all of the above flux removal procedures, the system shall be full of water so that joints are completely submerged at all times. The minimum flow rate in gallons per minute (gal/min) required for removal of residual brazing flux in piping systems shall be 1.5 times the internal pipe diameter (id) in inches. Upon completion of the flux removal procedure, completely drain the system and dry with air.
5.4.1 Requirements for final fit-up joints using minimum flux brazing procedure. Final fit-up joints that are used to install piping assemblies that were brazed and flushed prior to installation do not require a system flush following installation provided that a qualified minimum flux brazing procedure is used for joint fit-up.
5.5 Hydrostatic test after installation. The entire piping system, after installation up to the components, shall be subjected to the specified test pressure with tap water or with a hydraulic fluid equal to, or compatible with, the fluid normally used in the system. If water has been used, the system shall be drained completely after the test and blown dry with clean air. Components and piping assemblies which passed a hydrostatic test prior to installation need not be retested.
5.5.1 Hydraulic system/component preservation. Hydraulic systems and components which are subject to corrosion shall be preserved in accordance with MIL-STD-2073. Prior to all assembly, all oil films and preservatives shall be removed from those sections which shall be subjected to welding or brazing operations. Assembled systems which have been protected by a preservative fluid (see 5.5.1.1) shall be thoroughly drained and blown down before adding the system fluid. (See 5.9 for disposal instructions for these fluids.) If the assembled
system has not been thoroughly cleaned prior to adding protective fluids, a complete flush (see 5.6) shall be required before putting the system into operation.
5.5.1.1 Assembled systems. Hydraulic systems which are to be left inactive for 6 months or less shall be protected by filling with the system fluid. Those systems, fabricated from non-corrosion resistant piping, which are to be left inactive for an extended period (6 months or more) shall be filled with a suitable preservative fluid. For systems containing petroleum base or PAO base fluids, the preservative fluid shall be in accordance with
MIL-PRF-6083. For systems containing phosphate ester base hydraulic fluids such as MIL-H-19457 fluids, the preservative fluid shall be in accordance with MIL-H-19457 with addition of a vapor phase inhibitor in accordance with MIL-I-22110 in accordance with manufacturer's instructions. For water based systems, the preservative fluids shall be the system fluid in accordance with MIL-H-22072. Adequate vents and tanks shall be provided to compensate for the expanding and contracting fluid and minor system leaks. When the system is preserved with other than the normal system fluid, tags with the following information shall be conspicuously attached: "This system has been filled with preservative fluid to (specification) on (date). This fluid shall be completely drained and blown down before adding system fluid."
5.5.1.2 Components. If system components are not to be installed immediately, preservation shall be in accordance with the requirements specified in 5.5.1.2.1 through 5.5.1.2.3.
5.5.1.2.1 Short term (internal surfaces). For petroleum or PAO oil system components, short term preservation of internal surfaces shall be accomplished with fluids in accordance with MIL-PRF-6083. For phosphate-ester system components, internal surfaces shall be preserved with fluids in accordance with MIL-H-19457 with addition of vapor space inhibitor in accordance with MIL-I-22110, in accordance with the inhibitor manufacturer's instructions. Water based fluid system components in long term storage shall require annual treatments with the system fluid, as specified in MIL-H-22072. Preservation with coatings in accordance with MIL-PRF-6083 or MIL- H-19457 fluids is satisfactory for 1 year, after which recoating is required. Since these fluids, in small quantities,
are compatible with the system operating fluids, draining of residual fluid prior to installation will provide adequate removal of the preservatives. (See 5.9 for disposal instructions for these fluids.) (See 5.6.1 for definition of acceptable liquid contamination.) Complete removal and degreasing is required when brazing or welding is
necessary to reassemble the system. A tag with the following information shall be attached to the assembly: "The
interior of this item has been (filled, coated) with corrosion preventive fluid to (specification) on (date). Coatings require replacement 1 year from date. Prior to assembly, complete removal and degreasing is required if brazing or welding is necessary to assemble components."
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