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A cargo pump is a machine used to propel the liquid cargo from the tank into a pipe so that it may reach the shore tank (be discharged). We have learnt in our school days that the atmosphere can support a column of 10.336 m of fresh water (i.e. water of density 1.0000 kg/cm2). This…
Oil cargoes, like any other substance, can be measured in volume or weight. The volume will vary with temperature and hence it should be expressed in standard units so that a comparative study can be made. Temperature is measured in degrees Fahrenheit or degrees centigrade. The standard temperature used for all cargo calculations is 15º…
OIL DISCHARGE MONITORING CONTROL SYSTEM System The system required shall be such that the three way valve to allow discharge of the oily water into the sea, shall open once the above condition are satisfied and will remain open until such time as the above conditions are not breached. As soon as the condition for…
The International safety guide for oil Tankers and Terminals (ISGOTT) provides definitions of tanker terminology in common usage. Some important definitions are given below. These are for the information of non–tanker students. Students on tankers should use the latest edition of the ISGOTT. Students sailing on ships other than tankers need to know these definitions,…
On a oil tanker the cargo oil tank atmosphere changes as per various operations the ship is performing. These includes the Key Cargo Operations such as: Discharging Tank Cleaning Purging Gas Freeing Inerting Loading When performing these key cargo operations safely, The most important concern is to have a safe & controlled cargo tank…
What is Inert Gas ? It is a gas which contains insufficient Oxygen to support combustion. Keeping tanks inerted means cutting one side of the fire triangle and hence avoiding any chances or Fire or Explosion. Why do we need Inert Gas ? An Oil Tanker carries petrolieum cargo, which give out flammable vapors . …
General This system is provided to improve the efficiency of stripping work. It can perform complete stripping work by the cargo oil pump (hereinafter called “pump”) alone. The features of this system are as follows: 1) since most of stripping work is automated” pump operation is very easy. 2) since stripping work can be done…
What is Gauging ? Ullage and Sounding Usually ullages are used for calculation. In rare cases soundings may be used What is interface? The water in the cargo settles after loading and is called free water. Interface is the separation level between the cargo and the free water . Trim Correction To obtain the actual…
Gas Equipment The Catalytic Filament Combustible Gas (CFCG) Indicator is used for measuring hydrocarbon gas in air at concentrations below the lower flammable limit (LFL). The scale is graduated in % LFL. A CFCG Indicator must not be used for measuring hydrocarbon gas in inert atmospheres. Two types of instrument are available commercially for measuring…