NVIC Method

Show NVIC method.

STCW Competence Knowledge, Understanding, and Proficiency

Maintenance and repair of shipboard machinery and equipment

OICEW-C2 Appropriate basic mechanical knowledge and skills

Maintenance and repair, such as dismantling, adjustment and reassembling of machinery and equipment

The use of appropriate specialized tools and measuring instruments

Condition Behavior Standard

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

the candidate tightens an excessively leaking rotary pump packing stuffing box while in operation.


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

The candidate:

  1. Correctly plans for the job, using the proper sequence of actions to examine an operating rotary pump (without a mechanical seal) to tighten an excessively leaking packing stuffing box and determines if further examination of the pump is required;

  2. Determines through visual inspection if leakage of pumped fluid is dripping at an acceptable rate;

  3. Determines (for saltwater cooling service) if leakage is cool to the touch;

  4. Determines by using a set of dividers if packing is evenly distant from casing;

  5. Tightens packing gland by turning both packing gland nuts by a 1⁄4-turn before additional tightening to maintain a parallel position of the gland with the casing;

  6. Looks for a reduction in leakage and ascertains by touch if the leakage has become warmer;

  7. Continues tightening of the packing gland until the leakage is reduced to a continuous dribble and/or the leakage has begun to warm; and

  8. Notifies the senior engineer if leakage flow is not stemmed and/or the leakage has warmed excessively.

MMA Method

In order to satisfy NVIC 17-14 Task 9.1.B , MMA students must:

  • Successfully complete MMA Assessment OICEW-8E2B Centrifugal pump maintenance (packing)
  • Successfully complete MMA Assessment OICEW-8-2A Centrifugal pump maintenance (mechanical seal)