OICEW Task 8.3.A

Clean an oil purifier

MMA Method

In order to satisfy NVIC 17-14 Task 8.3.A , MMA students must:

NVIC Method

See NVIC method.

STCW Competence Knowledge, Understanding, and Proficiency

Appropriate use of hand tools, machine tools and measuring instruments for fabrication and repair on board

OICEW-C2 Application of Safe working practices in the workshop environment

Safety measures to be taken to ensure a safe working environment and for using hand tools, machine tools and measuring instruments

Use of hand tools, machine tools and measuring instruments.
Condition Behavior Standard

On a vessel of at least 1,000 HP, or in a laboratory or workshop,

the candidate opens, cleans, inspects, and closes a lube oil or fuel oil purifier.


All The assessment is required for all OICEW endorsements regardless of any limitations for propulsion mode and/or vessel equipment.

The candidate:

  1. Performs a lockout/tagout procedure and informs the engine crew;

  2. Closes and secures all liquid inlet and outlet valves;

  3. Releases clamp from atop oil input/supply tube;

  4. Raises and withdraws input/supply tube to fully extracted position;

  5. Releases both frame clamps;

  6. Lifts up front end of bowl hood and pivots back to locked position;

  7. Carefully and slowly screws in locking bolt while rotating bowl slowly to line up and locate recess provided;

  8. Repeats for second locking bolt;

  9. Locates and removes bowl cover ring wrench from tool board;

  10. Places bowl ring wrench level on bowl ring and gently drives wrench in clock-wise direction to loosen and un-screw ring;

  11. Lifts bowl ring and gently sets aside on soft surface;

  12. Locates and removes bowl cover-lifting tool from tool board;

  13. Places bowl cover-lifting tool around ring dam locking ring, lifts cover and places along-side bowl ring;

  14. Removes top disk and gently sets in cleaning fluid (diesel-oil).

  15. Firmly grasps distribution tube/disk stack, gently rocking and lifting to dislodge from bowl bottom;

  16. Removes distribution tube/disk stack and places on wood stand placed in bottom of cleaning solution receptacle;

  17. Removes accumulated sludge from top disk surfaces and wipes down to remove all traces of cleaning solution;

  18. Either singularly or as a stack lifts all disks from distribution tube and inverts in cleaning solution;

  19. Wipes out bowl with lint-free rag;

  20. Cleans sludge deposits from distribution tube and wipes cleaning solution residue from all surfaces;

  21. Firmly replaces distribution tube in center of bowl bottom and locks onto locating pin;

  22. Uses stiff-bristled brush to remove accumulated sludge from each disk, beginning with “bottom” disk, then wiping off disk surfaces to remove cleaning solution;

  23. Places “bottom disk” over distribution tube;

  24. Consecutively cleans and places each numbered intermediate disk until all disks have been cleaned and installed;

  25. With all intermediate disks in place, positions cleaned top disk onto disk stack;

  26. Checks bowl cover gasket for resilience, chipping, or fraying replacing as necessary;

  27. Wipes off underside of bowl cover;

  28. Places bowl cover in place noting to line up tang on cover to bowl notch;

  29. Sets bowl ring in place and rotates counterclockwise by hand until tight;

  30. Uses bowl ring wrench to drive bowl ring around until tight (make sure mark on top of bowl ring surface lines up within 1/8-inch of corresponding mark on bowl cover);

  31. Unscrews side-jacking bolts until bowl can be rotated freely by hand, and without binding;

  32. Releases bowl frame cover and gently lowers into place;

  33. Pushes supply tube/arm down and into position, securing with clamp;

  34. Secures opposite cover clamp; and returns all tools to centrifuge tool board, stows brushes, rags, and cleaning solutions; and

  35. Takes proper action to prevent safety and pollution violations.