NVIC 17-14 Task 9.1.C

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

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

the candidate performs valve and diaphragm maintenance on an air-operated diaphragm pump.

The candidate:

1. Correctly plans for the job, using the proper sequence of actions to examine an air operated diaphragm pump;

2. Takes all necessary precautions to ensure that there is no air pressure or fluid content, prior to pump maintenance;

3. Follows manufacturer’s instructions to disassemble, clean and examine, replacing any worn parts if necessary, and reassemble all parts of the pump;

4. Checks the following components for wear or damage and replaces if necessary;

5. Checks air side, ‘O’ rings and shaft assembly seals and fluid side ball valves, seats and ‘O’ rings for wear or damage and replaces if necessary;

6. Checks slide valve assembly and performs maintenance as necessary;

7. Ensures air filter is clean;

8. Ensures fluid inlet/suction and outlet/discharge ports are clean and not clogged with debris;

9. Re-starts the pump, observes for proper operation; and

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