OICEW Task 4.3.G

Secure steam turbine operation

MMA Method

In order to satisfy NVIC 17-14 Task 4.3.G , MMA students must:

NVIC Method

See NVIC method.

STCW Competence Knowledge, Understanding, and Proficiency

Operate main and auxiliary machinery and associated control systems

OICEW-A4.3 Preparation, operation, fault detection and necessary measures to prevent damage for the following machinery items and control system

Main engine and associated auxiliaries
Condition Behavior Standard

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

the candidate assists in securing a main steam turbine.


Note 1 A candidate who does not perform this task will receive an endorsement that is not valid for steam vessels.

The candidate:

  1. Secures the main steam stops at Finished With Engines;

  2. Alternately uses ahead and astern throttles to bleed off steam trapped in main steam lines;

  3. Secures bulkhead stops;

  4. Secures astern guarding valve;

  5. Verifies that main shaft is no longer rotating;

  6. Engages jacking gear once main shaft is confirmed is no longer rotating;

  7. Posts notice that main-engine “Jacking Gear Engaged”;

  8. Verifies that lube-oil system continues to operate;

  9. Verifies that lube-oil flow continues through turbine bearing sight glasses;

  10. Verifies that lube-oil temperatures at each bearing are below 160°F;

  11. Verifies that lube-oil cooler outlet temperature is maintained at recommended levels; and

  12. Verifies that each main shaft steady-bearing oil ring rotates freely.