Registered Ship Surveyor key terms

International Convention for the Safety of Life at Sea, which sets minimum safety standards for construction, equipment, and operation of ships; surveyors verify compliance during statutory surveys.

International Convention for the Prevention of Pollution from Ships, covering oil, chemicals, harmful substances, sewage, garbage, and air emissions; surveyors check compliance with its annexes.

International Convention on Load Lines that sets freeboard and load line marking requirements to ensure adequate reserve buoyancy and structural strength.

Non-governmental organization that develops and applies technical rules for ship construction and surveys; it issues class certificates confirming a ship's structural and mechanical fitness.

Inspection of foreign ships in national ports to verify compliance with international conventions; deficiencies may lead to detention until rectified.

Survey required by flag administration or recognized organization to verify compliance with international conventions, such as SOLAS or MARPOL, leading to issuance of statutory certificates.

Ability of a ship's hull girder to resist bending moments and shear forces along its length caused by uneven weight and buoyancy distribution.

The ship's hull considered as a box-shaped beam that provides overall longitudinal strength and stiffness; includes deck, bottom, and side plating.

Internal moment in the hull girder caused by vertical forces; sagging occurs when the midship section bends downward, hogging when it bends upward.

Vertical force acting on a hull transverse section due to the difference between weight and buoyancy; high shear forces can cause structural damage.

Vertical distance from the waterline to the freeboard deck at side amidships; it provides reserve buoyancy and is determined by load line rules.

Permanent mark on the ship's side indicating the maximum permissible draught under various conditions; includes deck line, load line disc, and seasonal marks.

Volume of watertight hull above the waterline that can be flooded before the ship sinks; essential for survivability after damage.

Ability of a ship to remain afloat and stable after flooding of one or more compartments; assessed through subdivision and probabilistic calculations.

Division of a ship's hull into watertight compartments by bulkheads and decks to limit flooding and maintain stability after damage.

Transverse or longitudinal bulkhead designed to withstand water pressure and prevent progressive flooding between compartments.

Foremost watertight bulkhead, typically located at a minimum distance from the stem, designed to limit flooding in case of bow damage.

Machinery and components that generate thrust to move the ship, including main engine, transmission, shafting, and propeller.

Primary power plant on a ship, usually a diesel engine or gas turbine, that drives the propeller through the shafting system.

System of shafts, bearings, and couplings transmitting power from the main engine to the propeller; includes thrust bearing and stern tube.

Shipboard machinery and systems other than main propulsion, such as generators, boilers, pumps, compressors, and steering gear.

Machinery that controls the rudder angle to steer the ship; must comply with SOLAS redundancy and emergency power requirements.

Network of generators, switchboards, cables, and protective devices that supplies electrical power to shipboard services.

Independent power source required by SOLAS to supply essential services such as lighting, steering, and navigation equipment in case of main power failure.

Computer-based system that monitors and controls ship machinery and processes, often including alarms, safety interlocks, and remote operation.

System of detectors, control panel, and alarms designed to detect fire in its early stages and alert the crew.

Fixed or portable equipment for fighting fires, such as water sprinklers, foam, CO2, or dry powder systems, required by SOLAS.

Equipment such as lifeboats, liferafts, lifebuoys, and immersion suits intended to save lives in an emergency; governed by SOLAS Chapter III.

Survival craft carried aboard ship to evacuate crew in an emergency; must meet SOLAS construction, equipment, and launching requirements.

Inflatable or rigid survival craft for emergency evacuation; often stored in canisters and launched by throwing overboard.

Structured sequence of actions a surveyor follows to inspect, test, and verify a ship's compliance with applicable rules and conventions.

Method used by a surveyor to examine a ship's structure or equipment, such as visual inspection, hammer testing, or non-destructive testing.

Formal document prepared by a surveyor recording findings, deficiencies, and recommendations from an inspection.

Examination methods such as ultrasonic, radiographic, magnetic particle, and dye penetrant testing that reveal defects without damaging the material.

Visual and non-destructive examination of welds to ensure they meet quality standards, including checks for cracks, porosity, and undercut.

Imperfection in a weld such as crack, porosity, slag inclusion, or lack of fusion that may reduce structural integrity.

Principles guiding a surveyor's conduct, including integrity, objectivity, confidentiality, and avoidance of conflicts of interest.

Situation where a surveyor's personal or financial interests could improperly influence professional judgment; must be disclosed and managed.

Legal responsibility of a surveyor for negligence or errors in inspection that cause loss or damage to a ship or its owners.