MIL-STD-1622B(SH)
(f)Material compatibility tables for metals, plastics and rubber. (g)Methods to monitor cleaner stability or usability if applied for
extended periods. Examples include monitoring pH for aqueous alkaline cleaners, and monitoring non-volatile residue (NVR) for solvent cleaners.
(h)Process waste disposal.
4.4.6 Cleaner quality. All cleaners used in the process shall have provisions to ensure consistent quality is received from the vendor. At the very least, the vendor should agree to issue advance notification of any changes to the cleaner composition. Realize that minor changes in composition can significantly effect material compatibility and toxicity.
4.5 Gases.
4.5.1 Safety precautions. Inert gases, such as nitrogen, although not toxic, will not support human respiration and can cause asphyxiation. Accumulation of this gas in small or closed spaces can reduce the oxygen concentration below the normal level of 20 to 22 percent. Ensure adequate ventilation is provided to maintain the oxygen levels within normal levels.
If doubt exists, an oxygen monitor with alarm set at 19.5 percent shall be used to monitor the area (see 6.4).
4.5.2 Air. Air shall be used for purging when specified herein. Air shall meet the quality requirements of the system in which it is used. Air shall be filtered to 10 micrometers nominal or finer.
4.5.3 Nitrogen. Nitrogen shall be used for purging when specified herein. Nitrogen shall meet the requirements of BB-N-411, type I, Class 1, grade A or B by vendor or laboratory statement of conformance. Nitrogen shall be filtered to 10 micrometers nominal or finer. If residual nitrogen in a system will present a problem, it shall be purged with air as required.
4.6 Cleaning silver-brazed piping. For systems with new silver brazed joints, residual brazing flux can be removed in accordance with NAVSEA 0900-
LP-001-7000 prior to cleaning. Residual brazing flux can also be removed with
NOC, TSP, or other aqueous cleaners that will remove flux. In either case,
the brazing flux shall be removed prior to the hydrostatic test.
4.7 Lubricants. Lubricants shall be approved for the application as specified in NAVSEA S9086-H7-STM-010/CH-262, component specification or other approved source. During reassembly, lubricants shall be used sparingly. Excessive quantities of lubricant can trap particulate and other contaminants developing a potential fire hazard. Avoid the use of fluorinated lubricants with aluminum and magnesium under conditions of large shear such as threaded connections. Ignition of fluorinated lubricants has occurred under these conditions.
5. DETAILED REQUIREMENTS
5.1 Facility requirements. Unless otherwise specified, the removal, replacement, repair, and cleaning of components and assembling, testing, and packaging of components cleaned in accordance with this standard shall be performed in a clean area. The clean area shall be free of air borne debris or contamination resulting from work accomplished in the immediate area.
5.2 Component cleaning process for general applications.
5.2.1 Applicability. This component cleaning process is for general applications items with surfaces that can be visually inspected. Items with
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