MIL-STD-1622B(SH)
hot grade B water through the flask. In order to prevent precipitation of the TSP, the TSP shall not be allowed to cool or remain uncirculated prior to rinsing as specified in 5.4.3(h).
(e)If the final cleaner is NOC, obtain a sample of no less than 200 mL of used NOC, and verify organic cleanliness as specified in 5.14.2 and in 5.14.3.2. If either analysis fails, replace the NOC and repeat the clean, verification, and rinse process. Do not wait
for analysis results before proceeding to rinsing as specified in
5.4.3(h).
(f)If the final cleaner is TSP, obtain a 500 to 600 mL sample of used
TSP and verify organic cleanliness by analyzing for hydrocarbons
or NVR as specified by MIL-STD-1330, or by an approved EPA Oil and
Grease Total Petroleum Hydrocarbon test method such as EPA Method
1664, or equal. The acceptance criteria is 15 ppm. If the
analysis fails, replace the TSP and repeat the final clean,
verification, and rinse process. Do not wait for analysis results
before proceeding to rinsing as specified in 5.4.3(h).
(g)For general applications that used a cleaner selected as specified
in 4.3, immediately rinse the flask with grade C water in
accordance with the process determined as specified in 4.4. Do
not dry the flask between cleaning and rinsing.
(h)After cleaning with NOC or TSP, immediately rinse the flask with
grade B water for critical applications or grade C water for
general applications. For corrosion resistant or phosphated
flasks, grade C water may be used followed by a grade B water
rinse. The water temperature shall be adequate to remove the
cleaning agent. Continue rinsing until the effluent rinse water
pH measured as specified in 5.14.4 is no greater than 8.0. Do not
dry the flask between cleaning and rinsing.
(i)Recirculate or spray grade B water for critical applications or
grade C water for general applications through the flask for no
less than 5 minutes. The water temperature does not need to be
elevated. Obtain a sample of the rinse effluent and verify
particulate cleanliness as specified in 5.14.3.1. If the analysis
of 5.14.3.1 fails, repeat this rinse step.
5.4.4 Drying. Drying after exposure of a flask to water or, for unpainted flasks, moist gas such as ambient air shall be accomplished as quickly as possible with air or nitrogen until a minus 20oF dew point is reached. Air or nitrogen preheaters, strip heaters, or vacuum pumps have been successfully used. Appropriate precautions shall be taken to prevent damaging the flask or support piping and equipment from excessive heat.
5.4.5 Final inspection and end fitting installation.
(a)While maintaining cleanliness as specified in 5.11, perform a visual inspection on the internal flask surfaces as specified in
5.14.1.1, except swipe inspections are not required. Flask surfaces that fail the inspection criteria of Table VIII shall be recleaned. Flask surfaces with evidence of corrosion shall be processed as specified in NAVSEA S9086-SY-STM-010/CH-551.
(b)While maintaining cleanliness as specified in 5.11, install end fittings and seal weld, if required, in accordance with the applicable specification. Uncoated steel flasks shall be evacuated to 20 inches or less of mercury or purged with dry air or nitrogen to remove moist air, and then pressurized to 5 to 15 lb/in2 with dry air or nitrogen.
5.5 Instruments and gages. For general applications, the requirements for cleaning instruments and gauges, including flowmeters and dead end
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