Combined pressure/vacuum valves are fitted to each cargo tank. These valves are designed to relieve positive or negative pressure in the tanks. Combined PV valves are fitted to each cargo oil and slop tank based on the vapor emission control system in accordance with USCG
The main cargo pump system consists of three vertical centrifugal single stage double suction type cargo pumps. They are situated at the bottom of the pump room and are driven by a single stage Curtis steam turbine and intermediate shaft passing into the pump room
The Gauging system Most of the terminals these days demand that a closed gauging / sampling system be followed on all tankers at their terminals. This means that the tanker must be able to gauge or sample the cargo in her tanks manually or automatically
Inert gas system The salient features of the inert gas regulations are listed below Note: Nitrogen generators are now used on Chemical tankers due to the nature of Nitrogen (No soot or water carry over). The system consists of the following components Boiler uptake valves
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
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
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 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