MIL-STD-1330D(SH)
20 September 1996
5.3.5.3 Steel flask surfaces classified as unsatisfactory because of corrosion and loose scale shall either be blasted in accordance with MIL-F-22606
or tumbled in accordance with CGA C-6.1 and then flushed as specified in 5.3.3.(f) or vacuumed to remove particulate until a satisfactory interior surface as specified in 5.3.5.(a) is obtained. Aluminum flask surfaces classified as unsatisfactory because of corrosion and loose scale shall be tumbled in accordance with CGA C-6.1 and then flushed as specified in 5.3.3.(f) or vacuumed to remove particulate until a satisfactory interior surface as specified in 5.3.5.(a) is obtained.
5.3.5.4 Flasks classified as unsatisfactory because of internal paint shall be blasted or chemically cleaned until a satisfactory interior surface as specified in 5.3.5.(a) is obtained. Flasks that have had interior paint removed by chemical methods shall be off-gas tested as specified in 5.9.3 to ensure removal of all chemical. Additionally, MIL-F-22606 flasks with evidence of internal paint shall be examined to determine the intended service of the flask. Flasks identified as Service A, which are intended for air systems, shall be replaced with Service B flasks which are intended for oxygen service.
5.4 Cleaning and calibration of instruments and gauges. The requirements for cleaning instruments and gauges, including flowmeters and dead-end pressure switches and transducers, within the boundaries defined in 1.2 shall be as directed (see 6.3) using a NAVSEA approved halogenated solvent. Instruments and gauges should be calibrated in place by a comparative calibration procedure in accordance with NAVSEA 0987-LP-022-3010.
5.5 Aqueous system cleaning process.
5.5.1 Applicability. The aqueous system cleaning process is applicable to all compatible systems other than liquid oxygen generating plants. It may be used for liquid oxygen generating plant piping provided the aqueous system cleaning process can be successfully accomplished. Flushing of ships service demineralized water system piping shall be as specified in 5.7.
5.5.2 Material and equipment.
(a) A supply of NOC or TSP as specified in 4.3 in a flushing rig as specified in 5.5.2(d).
(b) A supply of rinse water in a flushing rig as specified in 5.5.2(d). (c) A supply of nitrogen.
(d) A flushing rig consisting of tanks, pumps, piping, measuring devices for pressure, temperature, and flow, hoses, filters, and strainers. All items shall be compatible with the cleaner and attain the pressure, temperature, flow rates, and filtering required by this standard. Non-metallic material, other than seats, seals, and teflon, wetted by the cleaning solution shall be verified free of extractable organic material as specified in
4.3.1.9.
(e) Equipment to perform the applicable analyses as specified in 5.13.
This includes clean 1-liter containers to obtain the required
samples.
(f) A dew point indicator equal to the Ondyne Series 1400 Dewpoint
Indicator or the MCM Dewluxe Model hygrometer capable of detecting a dew point of minus 40EF (128 ppm H2O).
5.5.3 System preparation.
5.5.3.1 If shipboard conditions prevent flushing or testing a system as a single unit, the system may be divided into sections and flushed accordingly. System sections may be flushed as required to accommodate items such as interference problems and ship's schedule. Precautions shall be taken to ensure that portions of the system which have been certified oxygen clean are not flushed with contaminated cleaning agent. Local engineering shall review the flushing paths or line-ups to ensure the system has been flushed and sampled.
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