MIL-STD-419E
SAE J2321 - Ship Systems and Equipment - General Specification for Filter
Elements-Hydraulic and Lube Oil Service
(Copies of these documents are available from SAE World Headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or online at www.sae.org.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. DEFINITIONS
3.1 Flushing. The process of cleaning a hydraulic piping system that involves the circulation of turbulent flushing fluid within piping system loops to remove, transport and filter out particles and other contaminants that may have been introduced into the system during manufacture, construction and/or maintenance.
3.2 Outflushing. Unrestricted discharge of sufficient fluid volume to an open container or bucket to remove contamination from a dead end in the piping.
3.3 Pickling. A treatment of metallic surfaces in order to remove impurities, stains, rust, or scale with a solution called pickle liquor, containing strong mineral acids, before subsequent processing, such as extrusion, rolling, painting, galvanizing or plating.
4. GENERAL REQUIREMENTS
4.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.
4.2 Cleanliness. Pipe tubing and fittings related to the hydraulic power transmission equipment shall be thoroughly cleaned and pickled as necessary prior to installation (see 5.2 and 5.3). They shall be free from scale and foreign matter which could be detrimental to operation of hydraulic equipment such as pumps, motors, valves, rams, and accumulators.
4.3 Pipe construction and cleaning. Pipe required to complete a hydraulic installation shall be constructed in a shop where adequate facilities exist. However, shipboard or vehicle construction is allowed, provided adequate provisions exist to allow cleanliness controls and preclude damage to equipment. Subassemblies shall be used to the maximum extent practicable. After construction and bending operations are completed, the constructed and bent pipe, tubing, and fittings shall be cleaned and pickled in accordance with the procedures specified herein (see 5.2). Hydraulic components which may be constructed of materials not compatible with the pickling solution shall not be immersed in the cleaning or pickling baths. Complex components, such as pumps, valves, and rams, which may be compatible with the pickling solution but will require disassembly to remove residual fluids, shall not be immersed
in the cleaning or pickling baths. No hydraulic component that is mechanically connected (union, flange) to rigid piping shall be subject to the pickling solution.
4.4 Abrasive blasting. Sand, shot, or other abrasive blasting shall not be permitted on any part of the hydraulic system. Unless a separate isolated room is provided in the shop for construction of hydraulic piping, abrasive blasting shall be prohibited in the same building in which an open hydraulic component is housed. Abrasive blasting, chipping, or grinding shall not be permitted in the vicinity of an installation site for an open hydraulic system.
4.5 Sand packing. Hydraulic pipe or tubing shall not be packed with sand during the bending process.
4.6 Wire brushing. The pipe and tubing shall not be wire brushed after pickling.
4.7 Cloth and paper. Cloth or paper material shall not be used in drying operations, nor for capping open ends
(see 5.7).
4.8 Corrosion protection. The interior and exterior of the ferrous pipe, tubing, and fittings (except corrosion- resistant steel) shall be treated as specified in 5.5 to prevent corrosion.
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