MIL-STD-1622B(SH)
5.6.8 Rinsing and particulate flushing. For general applications that used a cleaner selected as specified in 4.3, rinse the system with grade C water in accordance with the process determined as specified in 4.4. Rinsing and particulate flushing after final pipe line cleaning with NOC or TSP shall be accomplished as follows:
(a)Remove the majority of NOC with air or nitrogen and collect for future use, or proceed to 5.6.8(b). When using air or nitrogen, do not allow NOC to dry before proceeding to 5.6.8(b).
(b)Remove NOC or TSP cleaning solution by rinsing the system once- through with grade B water for critical applications or grade C water for general applications at a velocity of not less than 3 ft/sec. Remove, replace, or bypass any return filter(s) that was used during the flush step prior to rinsing. The water temperature shall be not less than 110oF for NOC and 160oF for
TSP. Systems flushed with large in-line volumes, such as moisture separators, where the flushing velocity is less than 3 ft/sec
shall be back flushed with rinse water to ensure all cleaning agent is removed.
(c)Obtain a sample of the rinse effluent and measure the pH as specified in 5.14.4. When the effluent pH is not greater than
8.0, outlets shall be opened one at a time to help clean valve bodies and other probable pocketing areas. The rinse water shall then be recirculated until the pH of the effluent at each branch, vent, or drain is not greater than 8.0.
(d)For general applications, at the completion of rinsing, obtain a sample of the rinse effluent from each branch and perform a clarity inspection as specified in 5.14.3.2. If any of the samples fail due to the presence of oil or grease, replace the cleaning solution and repeat the pipe line cleaning process. If any of the samples fail due to other contaminants such as sediment, paint chips, bead blast, or resin beads, recirculate grade C water through the system at a velocity of not less than 3 ft/sec for not less than 30 minutes. The water temperature does not need to be elevated. Filters should be installed to trap particulate. Continue flushing until a sample of the effluent from each branch passes the clarity inspection as specified in
5.14.3.2.
(e)For critical applications, at the completion of rinsing, obtain a
sample of the rinse effluent from each branch and verify
particulate cleanliness as specified in 5.14.3.1. If any of the
samples do not pass the required inspection, recirculate grade B
water through the system at a velocity of not less than 3 ft/sec
for not less than 30 minutes. The water temperature does not need
to be elevated. Filters should be installed to trap particulate.
Continue flushing until a sample of the effluent from each branch
passes the particulate inspection as specified in 5.14.3.1.
(f)Any residual NOC or TSP in the cavities should be removed prior to
drying. Remove flush plugs and inspect for residual NOC or TSP.
Remove all visible traces of NOC or TSP by wiping each cavity and
flush plug with a clean cloth wetted with grade B water at a temperature of 100 to 120oF. The flush plugs should be reinstalled prior to drying with air or nitrogen.
5.6.9 Drying and reinstalling components. Drying, if required by Table
VI, and reinstallation of components shall be accomplished as follows:
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