MIL-STD-1622B(SH)
TABLE VI. Dryness level requirements.
System |
Maximum allowable dew point |
Maximum allowable water content |
Submarine Medium-pressure air High-pressure air 1/ Nitrogen Surface craft Electronics dry air High-pressure air 0xygen-nitrogen plant air supply Nitrogen |
-40oF at 14.7 lb/in2 |
0.000079 lb H20/lb dry air |
Submarines Diver's air Emergency breathing air Low pressure air Surface craft Diver's air Emergency breathing air Low-pressure vital & non-vital air Medium pressure air |
+20oF at 14.7 lb/in2 |
0.00214 lb H20/lb dry air |
Surface craft Bleed air Deballast air |
2/ |
2/ |
1/ Submarine EMBT blow bank dew points are verified to be -60oF or lower at
14.7 lb/in2 prior to use.
2/ Drying of these systems shall consist of removing bulk moisture to
minimize corrosion and formation of mold and mildew.
(a)Remove rinse water and dry the system with air or nitrogen until the dew point specified in Table VI is reached. Air or 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 air or 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. Do not exceed the
maximum system operating pressure.
(c)While maintaining cleanliness as specified in 5.11, all items shall
be removed which were installed in 5.6.3.2. A visual inspection
of each cavity shall be performed as specified in 5.14.1.1.
Additionally, where applicable, open and visually inspect all
large volumes as specified in 5.14.1.1. If the visual inspection
fails, reclean as specified in 5.13.4. While maintaining
cleanliness as specified in 5.11, components cleaned as specified
in 5.2 or 5.3, as applicable, shall be installed.
(d)The system shall be reassembled or packaged as specified in 5.16.1
to maintain cleanliness.
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