TM 5-4220-231-14&P 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. 3-28 Cleaning Method -  Trisodiurn 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 3-33) 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. (8)    Blow   dry    components with   clean air,   nitrogen or   helium. (9)    Reassemble components using an   approved lubricant. (10)   Bag and seal or   tape closed all   components and ends of   pipe or   hoses with   plastic until   ready for reinstallation. b. For   cleaning pipe    or   tubing the following procedures should be   followed: 3-44