Croatia Chief Engineer Officer flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Indicated power formula

For a two-stroke engine: IP = (P_m × L × A × n × 10^5) / 60 kW, where P_m is mean indicated pressure in bar, L is stroke in metres, A is piston area in m², and n is power strokes per second per cylinder.

Specific fuel consumption

SFOC is fuel mass flow in kg/h divided by brake power in kW. Typical large two-stroke diesel engines have SFOC between 165 and 180 g/kWh, with lower values indicating higher efficiency.

Crankcase oil mist alarm

The oil mist detector alarms when oil in air reaches about 2.5% by volume, which is half the lower explosive limit of approximately 5%. On alarm, reduce engine load immediately and investigate the source.

Propeller law

For a fixed-pitch propeller, power is proportional to the cube of rotational speed and thrust is proportional to the square of rotational speed. Reducing speed therefore reduces required power sharply.

Controllable pitch propeller

A CPP changes blade pitch hydraulically to reverse thrust or optimise load without changing shaft direction. It allows constant-speed operation for shaft generators and rapid manoeuvring but requires hydraulic oil pressure typically 60–100 bar.

Steering gear testing

SOLAS requires the main and auxiliary steering gear to be tested within 12 hours before departure. Emergency steering drills must be conducted every three months and recorded in the official logbook.

Load line marks

The load line disc shows summer (S), winter (W), tropical (T), fresh water (F), and tropical fresh (TF) marks. Freeboard increases from S to W by one forty-eighth of the summer draught.

Collision bulkhead location

SOLAS requires the collision bulkhead to be located between 0.05L and 0.08L from the forward perpendicular, where L is the ship's length. It must be watertight up to the bulkhead deck.

Metacentric height

GM equals KM minus KG. Positive GM indicates a stable ship, while negative GM causes an angle of loll. The IMO intact stability code requires a minimum initial GM of 0.15 m for cargo ships.

Free surface effect

Free surface effect reduces effective GM by the free surface moment divided by displacement. The moment equals density times the second moment of area of the free surface, so subdivided tanks minimise the loss.

Angle of loll

An angle of loll occurs when a ship has negative GM and rolls to either side. It is corrected by lowering weights or adding ballast low down to reduce KG, never by adding top weight.

MARPOL Annex I discharge

Machinery space bilge water may be discharged only when the ship is en route, outside special areas, and the oil content is below 15 ppm using approved filtering equipment with alarm and automatic stopping device.

STCW rest hours

STCW 2010 requires minimum rest of 10 hours in any 24-hour period and 77 hours in any 7-day period. Work hours must not exceed 14 hours in 24 hours or 72 hours in 7 days.

Basic safety training

STCW basic safety training covers personal survival techniques, fire prevention and firefighting, elementary first aid, and personal safety and social responsibility. Refresher training is required every five years.

Lifeboat drill frequency

SOLAS requires abandon ship and lifeboat drills every three months. An additional drill must be held within 24 hours of leaving port if more than 25% of the crew has changed.

Emergency generator capacity

The emergency generator must supply emergency lighting, navigation lights, radio communications, and steering gear for at least 18 hours on cargo ships and 36 hours on passenger ships.

Fire classes

Class A fires involve solid combustibles, B flammable liquids, C flammable gases, D combustible metals, and F cooking oils. The extinguishing agent must match the class to be effective and safe.

Fixed CO2 system quantity

For cargo spaces, the fixed CO2 quantity must be at least 30% of the gross volume of the largest cargo space. For machinery spaces, 20% is required with quick-closing valves.

Oil record book

MARPOL Annex I requires an Oil Record Book Part I for machinery space operations and Part II for cargo operations. Entries must be retained for three years and made for bilge transfers, sludge disposal, and bunkering.

Sulphur cap 2020

MARPOL Annex VI limits sulphur content of fuel oil to 0.50% m/m globally and 0.10% m/m in emission control areas. Scrubbers may be used if washwater discharge criteria are met.

Ballast water D-2 standard

The D-2 ballast water performance standard limits viable organisms: fewer than 10 per cubic metre for organisms 50 micrometres or larger, and fewer than 10 per millilitre for smaller organisms.

Three-phase power formula

For a balanced three-phase system, power equals the square root of three times line voltage times line current times power factor. This formula is used to calculate generator and motor loads.

Generator frequency formula

AC generator frequency equals the number of poles times rotational speed in rpm divided by 120. A four-pole generator running at 1500 rpm produces 50 Hz.

Insulation resistance minimum

Low-voltage circuits should have insulation resistance of at least 1 megohm when tested with a 500-volt megger. Results must be recorded in the insulation resistance log.

Planned maintenance system

A planned maintenance system schedules maintenance based on manufacturer intervals, running hours, and condition monitoring. Records are kept for class surveys and to demonstrate compliance with the ISM Code.

Crankcase inspection interval

Crankcase inspections are typically carried out every 3,000 to 4,000 running hours. Bearings, piston crowns, and liner wear are checked, and liner wear is measured with a micrometer.

Heat treatment processes

Annealing softens and relieves stress, normalising refines grain structure, quenching hardens, and tempering restores toughness after quenching. The process is selected according to the required mechanical properties.

Micrometer accuracy

A standard outside micrometer measures to 0.01 millimetres, while a vernier caliper typically measures to 0.02 millimetres. A dial gauge measures to 0.01 millimetres and is used for runout checks.

ISM Code requirements

The ISM Code requires a Safety Management System, a designated person ashore, clear master's responsibility and authority, and internal audits. It applies to all ships and aims to ensure safety and pollution prevention.

MLC 2006 minimum age

The Maritime Labour Convention 2006 sets the minimum age of seafarers at 16 years. It also covers hours of work and rest, accommodation, food, medical care, repatriation, and complaint procedures.

CPR compression rate

Cardiopulmonary resuscitation requires chest compressions at a rate of 100 to 120 per minute with a depth of 5 to 6 centimetres. The ratio is 30 compressions to 2 rescue breaths.

Burn first aid

Cool a burn with running water for at least 10 minutes, do not remove stuck clothing, and cover with a sterile non-adherent dressing. Seek medical advice for large or deep burns.