TM 5-4220-227-14
(6) Perform a shake test by collecting a 1000 mL sample of rinse water in a flask that can be fitted with a rubber
stopper. Shake the flask for a few seconds and if any bubbles form and remain on the surface of the water in the
flask, continue to rinse the hose until no bubbles form and remain in the sample flask.
(7) Purge hose assembly with clean, dry, oil-free nitrogen (preferably heated to 200 degrees F (93 degrees C)) until
all visible signs of water are absent. Continue drying process for 1 to 2 hours after initial purge.
NOTE
At no time shall the upstream purge pressure for all hose assemblies exceed 100 psig
(6895 millibars).
(8) After drying, cover each hose end with a clean plastic bag to maintain internal cleanliness. Secure the bag with 1
inch (2.5 cm) wide tape.
(9) When components and systems have been reassembled an air sample shall be taken to verify cleanliness.
4-57. Cleaning Method Trisodium Phosphate (TSP). This method is the preferred method if all equipment is
available. A steam/hot water cleaner that has adjustable siphon control for cleaning applications works well.
a. For components the following steps should be followed:
WARNING
The TSP cleaning solution is harmful to eyes and skin. Wear chemical protective apron,
gloves and goggles/face shield when handling or working with the solution.
(1)
Prepare a solution consisting of 2 pounds (0.9 kg) TSP, 0.5 ounces (14.7 mL) non-ionic detergent and 80 gallons
(302.8 L) of distilled or deionized water.
(2)
Heat solution to 165 degrees F (74 degrees C) mixing occasionally during the heating.
(3)
Disassemble components down to the smallest parts (separate and clean soft goods and aluminum parts as
specified in paragraph 4-58) and soak in the solution for 10 minutes minimum, 30 minutes maximum.
(4)
After soaking, clean the parts in the ultrasonic cleaner until all visible traces of contaminate dirt or grease are
gone.
(5)
For components too large for an ultrasonic cleaner, scrub the parts with a nylon bristle brush until all visible traces
of contaminate dirt or grease are gone.
(6)
Rinse all parts in running hot distilled water or deionized water until all visual traces of cleaning solution are
removed.
(7)
Draw 10 mL sample. Agitate or rinse water to observe for soap bubbles. If any soap bubbles are present, repeat
steps (6) and (7) until no bubbles are observed.
4-89
