Engineering Maintenance, Materials and Workshop Practice
Core concepts
Understand planned maintenance systems, condition monitoring (vibration, oil analysis, thermography), and the properties of engineering materials: mild steel, cast iron, stainless steel, bronze, and aluminium alloys. Know heat treatment (annealing, normalising, hardening, tempering), welding processes and defects, and workshop practice including measurement, tolerances, fits and limits. Understand corrosion types and prevention (galvanic, crevice, stress, erosion) and the use of sacrificial anodes and coatings.
Traps
- Confusing hardening with tempering; hardening increases brittleness, tempering restores toughness.
- Assuming stainless steel is immune to corrosion; it suffers chloride stress corrosion and pitting.
- Mixing up clearances and interference fits; interference fits require heating or pressing.
- Overlooking that vibration analysis detects bearing defects before failure.
- Forgetting that dissimilar metals in seawater cause galvanic corrosion; the less noble metal sacrifices.
Worked example / rule of thumb
Rule of thumb: a bearing temperature rise of more than 10 °C above normal, or vibration velocity above 4.5 mm/s RMS on a typical machine, warrants investigation. For fits, remember: clearance fit allows relative motion; interference fit locks the parts. Use the correct measuring instrument (micrometer for outside diameters, bore gauge for inside).
Maritime Law, Regulations and Engineer's Responsibilities
Core concepts
Know the international regulatory framework: IMO conventions (SOLAS, MARPOL, STCW, MLC), flag state and port state control, classification societies and statutory surveys, and the ISM Code. Understand the engineer's responsibilities under STCW (watchkeeping, rest hours, certificates of competency), the master's authority, and the chain of responsibility. Know the meaning of detention, deficiency, and the role of the designated person ashore.
Traps
- Confusing flag state (registration and survey) with port state control (inspection of foreign ships).
- Forgetting that STCW rest hour requirements apply to watchkeepers and must be recorded.
- Assuming a classification society certificate replaces a statutory certificate; they are distinct.
- Overlooking that the designated person ashore is a link to the highest level of management, not the master.
- Misunderstanding that the master has overriding authority for safety and pollution prevention.
Worked example / rule of thumb
Rule of thumb: minimum rest for watchkeepers is 10 hours in any 24-hour period and 77 hours in any 7-day period, in not more than two periods, one of at least 6 hours. Keep records. During port state control, be ready to produce certificates, the Oil Record Book, and records of drills and rest hours.