MIL-STD-419E
b. Flushing shall be performed in the same direction as the normal fluid flow during system operation. When the normal system flow may be in either direction, such as in control port actuator lines, flushing these lines in both directions shall be required only when specified by the acquiring activity. Circuits having a rise in elevation in the direction of flow shall require reversing the direction of the flush to ensure that the system is clean in both directions only when specified by the acquiring activity. When flushing is done in both directions, flushing in the direction of normal flow shall be done last.
c. Large components that are assembled or disassembled in place to support new construction or overhaul of hydraulic systems can be cleaned in place. Best shop practice and judgment shall be used in determining the extent of assembly or disassembly of these large components in obtaining a visually clean condition of the component's internal parts as an alternate to flushing the component.
d. Components such as reservoirs, accumulators, and cylinders shall be flush rinsed with a high velocity jet stream or wiped clean with a lint-free cloth as conditions permit to attain a visually clean condition. Pistons shall be removed from cylinders and accumulators for shop cleaning when practical. When wiping is necessary, lint-free toweling shall be used. Components cleaned in the shop prior to installation and properly preserved, sealed, and stored may be connected to the piping after the piping is flushed, without further cleaning (see 5.5.1.2).
e. Reasonable technical competence shall be exercised in planning the flushing of a system.
(MIL-HDBK-407 is recommended for background information). Unless otherwise specified by the contracting officer or the ship supervisor (see 6.1), flushing shall continue until the fluid indicates that the class 9 cleanliness requirement of SAE-AS4059 (or ISO 4406) has been achieved to suit the turbulent flow requirements of paragraph
5.6.1 and the minimum flushing time specified in 5.6.1.1. Prior to termination of flushing the system piping, the water content of the flushing fluid shall be determined when the flushing fluid is not water based. Unless otherwise specified by the ordering document (see 6.1), the water content shall not exceed 0.05 percent by volume for any single sample. Unless otherwise specified by the ordering document (see 6.1), the average of the samples taken prior to terminating the flush shall not exceed 0.03 percent by volume for any system or circuit thereof. After flushing and reassembly, the system shall be filled with fluid which meets the applicable system fluid specification, satisfies the required system fluid cleanliness requirements, and has been final filtered through a filter in accordance with SAE J2321, or equal, during the system fill process.
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