MIL-STD-1330D(SH)
20 September 1996
(d) Obtain a 500 to 600 mL sample of the used NOC or TSP in a 1-liter container and verify organic cleanliness as specified in 5.13.2. If any analysis fails, replace the cleaner and repeat the clean, verification, and rinse process. Do not wait for the results of
5.13.2 before proceeding to rinsing as specified in 5.3.3(e). (e) After flushing with NOC or TSP, immediately rinse the flask with
grade B water. For corrosion resistant 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
5.13.4.2 is not greater than 8.0. Do not dry the flask between cleaning and rinsing.
(f) Recirculate or spray grade B water through the flask for not 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 5.13.3. If the particulate analysis of 5.13.3 fails, repeat the rinse step.
5.3.4 Drying. Drying after exposure of a flask to water or moist gas, such as ambient air, shall be accomplished as follows.
(a) Dry the flask as quickly as possible with nitrogen until a minus
20EF dew point is reached. 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.
(b) While maintaining cleanliness as specified in 5.10, perform a visual inspection on the internal flask surfaces as specified in
5.13.1.2 and 5.13.1.3. Flask surfaces with evidence of oil, grease, ink, dye, particulate, or fibers shall be recleaned. Flask surfaces with evidence of corrosion shall be blasted or tumbled as specified in 5.3.5.3.
(c) While maintaining cleanliness as specified in 5.10, install end fittings and seal weld, if required, in accordance with the applicable specification. Steel flasks shall be evacuated to 20 inches or less of mercury or purged with nitrogen to remove moist
air, and then pressurized to 5 to 15 lb/in2
with nitrogen.
5.3.5 In-service interior inspection. When interior inspections of
in-service flasks are required for recertification, the interior surfaces shall be
inspected for evidence of corrosion, loose scale, particulate, grit, filings,
paint, oil, and grease as specified in 5.13.1.2 and 5.13.1.3. Interior surfaces
shall also be inspected and the outside surface of the flask marked to indicate
the location of pits, cuts, burns, defects, and so forth. Pits, gouges, burns,
arc strikes, and other surface defects shall be treated in accordance with NAVSEA
S9086-SY-STM-010/CH-551, CGA C-6.1, or CGA C-6.2. Steel flasks shall be evacuated
to 20 inches or less of mercury or purged with nitrogen to remove moist air, and
then pressurized to 5 to 15 lb/in2
with nitrogen immediately after the internal
inspection if satisfactory, or corrective action of 5.3.5.1 to 5.3.5.4 if unsatisfactory. Based on the interior inspection, flasks shall be classified in accordance with the following criteria.
(a) Satisfactory: Not more than 10 percent of the internal surface has evidence of corrosion or particulate, and no evidence of loose scale, filings, paint, oil, or grease on the internal surface.
(b) Unsatisfactory: More than 10 percent of the internal surface has evidence of corrosion or particulate, or any evidence of loose scale, filings, paint, oil, or grease on the internal surface.
5.3.5.1 Flasks classified as unsatisfactory because of oil and grease shall be cleaned as specified in 5.3.3.
5.3.5.2 Flasks classified as unsatisfactory because of particulate or grit shall be flushed as specified in 5.3.3.(f) or vacuumed until a satisfactory interior surface as specified in 5.3.5(a) is obtained.
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