MIL-STD-1330D(SH)
w/ Change 1
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
in accordance with NAVSEA ST700-F1-PR0-010 (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 N0C 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 0ndyne Series 1400 Dewpoint Indicator or the MCM Dewluxe Model hygrometer capable of detecting a dew point of minus 40 °F (128 ppm H20).
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.
5.5.3.2 The following items shall be accomplished to prepare a system for flushing:
a. Repairs to the piping system shall be completed before flushing is started.
b. Valves, valve internals, pressure regulators, filter elements, or other mechanically jointed components that will interfere with the flow of the cleaning agent should be removed and flush plugs, spools, jumpers, and blanks shall be installed. Where jumpers are used, their inside diameter should be not less than the piping they are bypassing. Seal welded regulators may be left in place if the high pressure chambers are disassembled and the nozzles removed.
c. Items having incompatible material that can be damaged during flushing shall be removed.
d. Components such as instruments which are not free draining shall be removed or isolated if appropriately configured. Cleanliness of certified oxygen clean instruments shall be maintained as specified in 5.10.
e. Flow restrictors, if installed in the supply nipple upstream of the oxygen regulators, shall also be removed. f. Flushing rig, including temporary piping, components, and flush plugs required for system flushing, shall
be pressure tested and cleaned to remove loose scale, dust, grit, filings, oil, and grease.
5.5.3.3 All removed items shall be cleaned as specified in 5.2. Where it is necessary to flush with valve cartridges installed, after the flush, each cartridge shall be removed and cleaned as specified in 5.2.
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