MIL-STD-1330D(SH)
20 September 1996
20EF is acceptable. Nitrogen preheaters, strip heaters, or vacuum pumps have been successfully used. Appropriate precautions shall be taken to prevent damaging piping and equipment.
(b) The recommended drying method is using nitrogen at low flow rates.
This allows the gas to evaporate the moisture. Higher flow rates
are suitable for removing visible moisture. If it is suspected
that pockets of water exist at low points in the system, a high-
volume blow-down can be employed. The pressure should be not
greater than 100 lb/in2
is less.
or maximum operating pressure, whichever
(c) While maintaining cleanliness as specified in 5.10, all items shall be removed which were installed in 5.5.3.2. A visual inspection
of each cavity shall be performed as specified in 5.13.1. Additionally, where applicable, open and visually inspect all large volumes as specified in 5.13.1. If the visual inspection fails, locally clean as specified in 5.12.4. While maintaining cleanliness as specified in 5.10, components cleaned as specified in 5.2 shall be installed.
(d) The system shall be reassembled and pressurized with nitrogen or helium to maintain not less than 10 lb/in2, or packaged as specified in 5.16 to maintain cleanliness. If the pressure should drop below 10 lb/in2, the responsible authority shall investigate the circumstances associated with the pressure drop to ensure that no contamination could have entered the system which would require repeating the flush.
(e) Test, charge with system fluid, and return to operational conditions.
5.6 Potassium hydroxide (KOH) inspection.
5.6.1 Applicability. This inspection applies only if the system has an electrolytic oxygen gas generator that uses KOH. The oxygen system shall be visually inspected for KOH contamination at mechanical joints before the system is flushed as specified in 5.5.5 through 5.5.9. KOH is a whitish solid that may
occur as a scale on the inside of pipes and components.
5.6.2 Inspection. The inspection for KOH contamination shall be accomplished as follows:
(a) The piping to the oxygen generator union connection shall be examined for KOH contamination. If no KOH is found, no further inspection shall be required. If contamination is found, perform the inspection as specified in 5.6.2(b).
(b) If KOH is found in the oxygen generator union connection as identified in 5.6.2(a), downstream piping to the isolation valves in the distribution header shall be visually inspected. If no KOH is found in this section, no further inspection is required and
the KOH shall be removed as specified in 5.6.3. If KOH is found in this section, the remainder of the system shall be visually inspected as specified in 5.6.2(c).
(c) If KOH is found in the distribution header as identified in
5.6.2(b), the remainder of the system shall be visually inspected.
The KOH shall be removed as specified in 5.6.3.
5.6.3 KOH removal. KOH shall be removed by flushing with grade B water at a temperature of 120 to 140EF. Flush until the conductivity of the effluent is within 2 micromhos of the influent, or the pH measured as specified in 5.13.4.2 is
8.0 or less. Dry as specified in 5.5.10.
5.7 Flushing of ships service demineralized water piping systems.
5.7.1 Applicability. This process applies to ships service demineralized water piping systems as defined in 1.2.2.4
5.7.2 Material and equipment. The following material and equipment are required.
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