TANKER

• The International Safety Guide for Oil Tankers and Terminal (ISGOTT)
• Current edition: Sixth Edition, June 2020
• It contains guidance for the safe carriage and handling of petroleum products.
• It is published by ICS (International Chamber of Shipping) on behalf of OCIMF (Oil companies International & Marine Forum) & International Association of Ports and harbours (IAPH)
• It is divided into four parts:
            Part 1: General Information
            Park 2: Tanker Information
            Part 3: Terminal Information

                    Part 4: Ship|shore (tanker/terminal) interface

     Contents:-

         Part 1: General Information
                   Chapter 1 – Basic: properties of petroleum
                   Chapter 2- Hazards of petroleum
                   Chapter 3- Static electricity
                   Chapter 4 – General hazards for ship and terminal
                   Chapter 5-  Fire fighting
                   Chapter 6- Security

         Part 2: Tanker Information
                   Chapter 7 – Shipboard system
                   Chapter 8- Ship’s equipment
                   Chapter 9- Management of safety & emergencies
                   Chapter 10- Enclosed space
                   Chapter 11- Shipboard operations
                   Chapter 12- Carriage & stowage of hazardous material

                  Chapter 13- Human element consideration 
                  Chapter 14- Special ship type       

         Part 3: Terminal Information
                   Chapter 15- Terminal management and organisation
                   Chapter 16- Terminal operations
                   Chapter 17- Terminal systems and equipment
                   Chapter 18- Cargo transfer equipment
                   Chapter 19- Safety and fire protection
                   Chapter 20- Emergency preparedness

                   Chapter 21- Emegency evacuation       

         Part 4: Ship/Shore Interface
                   Chapter 22- Communication
                   Chapter 23- Mooring
                   Chapter 24- Precautions on ship & terminal during cargo operation.
                   Chapter 25- Bunkering operation
                   Chapter 26- Safety management            

• A flammability diagram explains to us how a gas or a mixture of two gases will behave and catch fire when diluted with another gas or air.

• The flammability diagram is the key element for planning a safe operation on board a ship.

• For example, let’s say we get lower flammability limit 1% (Point C) & upper flammability limit 10% (Point D) from MSDS of a crude oil.

• For understanding, let’s take point F as a condition in our tank. At point F, HC gas is approximately 11% & oxygen is approximately 2%.

• Now, at this point, if we do dilution with air, it will follow the path AF, i.e. HC gas component keeps on decreasing & the oxygen content keeps on increasing gradually (because oxygen is present in the air).

• At a particular point, this line will come in contact with the flammability mixture curve & there will be a high chance of explosion.

• So, we will use inert gas to lower the HC gas component & little bit of oxygen content till point H.

• After dilution with I.G., we can dilute with air; it will follow the path AH, and it will be much safer as it is far away from the flammability curve & there will be very less chances of explosion.

• If we lower the HC gas component till point G & then we dilute with air, it will follow the path AG, which is very close to the flammability mixture & there will be a risk of explosion.

Toggle Content