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GC CODE 1983

CHAPTER XI | FIRE PROTECTION 11.3 WATER SPRAY SYSTEM 11.3.1 On ships carrying flammable or toxic products, a water spray system for cooling, fire prevention and crew protection should be installed to cover: a. exposed cargo tank domes and any exposed parts of cargo tanks; b. exposed on-deck storage vessels for flammable or toxic products; […]

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IGC CODE 1983

CHAPTER 8 | VENT SYSTEMS 8.2 PRESSURE RELIEF SYSTEMS [For ships constructed from 01-Jul-2016, Applicable from 01-Jan-2016]   8.2.1 Cargo tanks, including deck tanks, shall be fitted with a minimum of two pressure relief valves (PRVs), each being of equal size within manufacturer’s tolerances and suitably designed and constructed for the prescribed service. 8.2.2 Inter […]

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LNG Boil Off as Fuel

Although it is feasible to reliquefy LNG boil-off vapours, the equipment required is complex and expensive and, to date, full-scale equipment has not been installed on board ships. As methane vapours, at ambient temperature, are lighter than air, boil-off is used as fuel for the ship’s main propulsion during sea passages. LNG is the only […]

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IGC CODE 1983

CHAPTER 2 | SHIP SURVIVAL 2.1 GENERAL [For ships constructed from 01-Jul-2016, Applicable from 01-Jan-2016] 2.1.1 Ships subject to the Code shall survive the hydrostatic effects of flooding following assumed hull damage caused by some external force. In addition, to safeguard the ship and the environment, the cargo tanks shall be protected from penetration in […]

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GC CODE 1983

CHAPTER 1 | GENERAL 1.1 PURPOSE The purpose of this Code, in the following referred to as the Code, is to recommend suitable design criteria, construction standards and other safety measures for ships transporting liquefied gases and certain other substances in bulk so as to minimize the risk to the ship, its crew and to […]

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Types of Cargo Tanks

A cargo containment system is the total arrangement for containing cargo including, where fitted: • A primary barrier (the cargo tank), • Secondary barrier (if fitted), • Associated thermal insulation, • Any intervening spaces, and • Adjacent structure, if necessary, for the support of these elements. For cargoes carried at temperatures between -10°C and -55°C […]

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Ideal Gas Laws

Boyle’s Law States that, at constant temperature the volume of a fixed mass of gas varies inversely with the absolute pressure. This relationship is illustrated in figure 4.6(a) an can be written:- Boyle’s law for gases (constant temperature) Charle’s Law states that, at constant pressure, the volume of a fixed mass of gas increases by […]

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