TM 5-4220-231-14&P 3-30    Hydrocarbon Inspection and   Analysis. a. Visual   Method. By  definition,   visibly  clean is  the   absence of  all  particulate and    non-particulate matter visible    to   the   normal unaided (except for   corrected vision) eye. Particulate is   identified as    matter of  miniature size with   observable length, width    and    thickness. Non-particulate is  film  matter without definite dimension. Examples of  visual inspection are: (1)   A  clean cloth    placed over   the    discharge end    may    collect particulates and   debris when air   or   nitrogen is  blown through the    system. (2)   A  component that    has been "in  service" may    have    visible signs of  grease, dirt,   etc. (3)   Absorption of  oil  or  grease on   a   clean filter   paper from   a   surface wipe. b. Ultraviolet Light   Method. The    ultraviolet method for   detecting hydrocarbons may    be    employed in  several different ways. WARNING Most ultraviolet lamps contain mercury. Extreme caution should be   taken not   to   break the mercury vapor lamp    which will  contaminate the   component or   pipe    being inspected and    may    also    cause human injury. (1)   Direct Inspection: The    component may   be    examined directly    with   the   ultraviolet light. By   passing the component under the    ultraviolet light,   hydrocarbon surface contamination may exhibit fluorescence where some hydrocarbons exist. (2)   Inspection of  Cleaning Solution When Detergent is  Used: Used cleaning solution collected in  a  clean beaker when agitated will  form    bubbles. These bubbles, under ultraviolet light,   may   exhibit fluorescence. 3-31 Documentation and Record Keeping a. This    diving system must retain certain records and documents to   substantiate safety standards. The individual operating the    clean area being directly involved with   system maintenance should therefore be    required to   maintain records documenting cleaning operations in  a  systematic manner. b. The purpose of  this section is   to   set    forth    a   guide for   documentation and record keeping involved in cleaning operations and in  no   way    intends to   impose restrictions on  the   amount of  paperwork a   unit  feels it requires to  operate safely. c. A   sequential record should be    maintained of   components cleaned (i.e., regulators, pipe, and/or any component) affecting reentry into  a  certified system. It should include a  written    record of   all  cleaning analyses and testing accomplished as    per    this   procedure. A  data sheet should be   completed for   items cleaned and   tested per this    procedure. All  other information which pertains to   the    cleaning and/or testing of   a   particular item    shall be attached to   or   referenced on    the data sheet. Such information should include, but    not    be    limited    to    outside laboratory reports, vendor data, etc. The    completed data sheet(s) will  then be   attached to   the    REC Report and referenced in  the    remarks column on   the    Reentry Control Log. (Refer to   Para. 3-13). 3-48