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Category Archives: Tanker


Tank cleaning It is customary to clean the cargo tanks as a preparation to load the next cargo after the cargo is discharged and the tanker sails out from the discharge port. This is done because the next cargo may not be compatible with the

Cargo Pumps

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


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.


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

tanker definitions

Tanker Definitions

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

oil tanker

Oil Tanker Cargo Tank Atmosphere Control

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

Inert gas system

Inert gas System

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

Automatic Unloading System

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

Tanker Cargo Calculations

What is Gauging ? Measurement of Ullage or Sounding  Measurement of Temperature Measurement of Interface 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

Gas Equipments

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