MIL-STD-1622B(SH)
(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 -40oF (128 ppm H2O).
5.6.3 System preparation.
5.6.3.1 If shipboard conditions prevent flushing or testing a system as a single unit, the system may be divided into sections and flushed in any order. Precautions shall be taken to ensure that portions of the system which have been certified clean are not flushed with contaminated cleaning agent.
5.6.3.2 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 not be less than the piping
they are bypassing.
(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
clean instruments shall be maintained as specified in 5.11.
(e)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.
(f)Ensure that any electrically operated components such as
compressors, dehydrators, and solenoid valves are secured and
safety tagged.
5.6.3.3 All removed items shall be cleaned as specified in 5.2 or 5.3, as applicable. 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 or 5.3, as applicable.
5.6.3.4 Large in-line volumes that will not support minimum flushing velocities should be individually cleaned and bypassed when flushing. The concern is that some cleaners such as NOC and TSP remove soil by displacement. In areas of low flow, suspended oil can separate from NOC or TSP and collect. Because of this, perform the following when flushing large in-line volumes:
(a)For general applications, recommend flushing as specified in 5.6.7 with a low foaming detergent cleaner that will emulsify oil contamination selected as specified in 4.3. If using NOC or TSP, review 5.6.3.4(b) for applicable direction.
(b)For critical applications where the volume cannot be bypassed, cannot be inspected and locally cleaned as specified in 5.13.4, and will collect separated oil, perform the following with local engineering approval: isolate the volume into the smallest possible flushing loop possible, preclean with a low foaming detergent that will emulsify oil contamination selected as specified in 4.3, and then perform the preflush as specified in
5.6.5 prior to the final flush. The precleaner is used to remove oil and grease contamination, and then NOC or TSP final cleaner is used to remove any precleaner residue and verify cleanliness. For
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