ship handling

Oil Tanker operation : Procedure and basic guidance



Oil tanker at sea


The operation of modern oil tankers involve numerous complexities and careful consideration will need to be made for various shipboard activities. Our site is a quick guide to finding tanker vessel operation related information.

The procedures explained here are only indicative, not exhaustive in nature and one must always be guided by practices of good seamanship.




How to ensure safe working atmosphere onboard oil tankers

The basic procedure - Restriction of Smoking, other Burning activities and Naked Lights


The basic procedure of ship to ship transfer

For dealing with Unforeseen Emergencies, such events can be contained and their effects minimized by preparing the ship’s crew through a system of drills


Pumproom inspection procedure for oil tanker

A pump room contains the largest concentration of cargo pipelines of any space within the ship and leakage of a volatile product from any part of this system could lead to the rapid generation of a flammable or toxic atmosphere


How to ensure safe working area onboard oil tankers

Before work, the conditions of working area, such as the density of inflammable gas and fire, shall be positively managed, and the work shall be started after necessary safety of the work is confirmed



Tanker operation : Matters That Require Attention At Sea

Maintenance of Vent Line System, Cautions about Sparks from Funnel, Avoidance of Thunder Storms, Ballasting and Cargo Oil Transfer Operations


Tanker operation: Inert gas system

The oxygen content of the Inert Gas supplied to cargo tanks should be 5% or less. However, it is to be noted that too less content of oxygen in the IG would introduce other impurities into the cargo tanks


Safety preparation for oil tanker prior entering freezing area

The Master shall ensure that the appropriate measures have been taken to prevent damage to Vessel, Machinery, Pipelines and Equipment prior entry into areas with Freezing Conditions


Daily soundings of tanks and bilges

Bilge (Hold, Engine Room, Cofferdam, Void space, Chain Locker, Emergency Fire Pump Room, Bow Thruster Room, etc.),Ballast Water Tanks , Fresh Water Tanks



Oil pollution control

Equipment For Oil pollution Control, Equipment for Oil Pollution Mitigation, Guidelines For Prevention Of Oil Pollution Mitigation, Action by Duty Officer, Plugging Deck Scupper Plugs


Gas freeing procedure onboard oil tanker

It is generally recognized that Tank cleaning and Gas freeing is the most hazardous period of tanker operations. This is true whether Washing for clean ballast tanks, Gas freeing for entry, or Gas freeing for Hot work.


Oil handling procedure

Bunkering Operation, Measures during Extreme Weather, Restrictions on Use of Fire, smoking, and other General Precautions to the Crew


General safety measures against oil pollution accident

Working system and preparation , Planning for Cargo Oil Operations ,Pre-safety meeting , Effective Communication ,Promote techniques of Hazard Prediction Training, Preparation of Watch Schedule & PIC of Oil Transfer Operations, Have a complete meeting beforehand with terminal ,Cargo Oil Transfer Check Lists ,Ship / Shore Safety Checklist ,Pre Arrival Checks ,Check Operational Conditions and Training of Crew


Preparations For Oil Loading

Preparation of the Cargo Plan, Preparing of Ballast Pumps,Cargo Oil Transfer Check Lists, Hose Connection,Display of warning notices and signs, Cargo Oil Transfer Meetings with Terminal representative,Dry Survey / OBQ survey,Lining up Pipelines and Valves,Precautions for Loading Heated Cargo, Personnel arrangement


Tanker Standard Equipment Of Prevention Of Oil Spillage

Cargo Tank Level Measuring System and Level Alarm System, Emergency Hydraulic Hand Pump, “Software”/Guidelines For Prevention Of Oil Spillage ,Operation Guidelines for Cargo / Ballast valves, Prevent Erroneous Operation of Valves, Valve Handling with Avoiding Liquid Hammer, Securing Indication for Closed Valves


Loading operation onboard oil tankers

Line up of the Vent lines, Safety Confirmations and Clearance,Leakage Monitoring System ,Cargo Loading Rates , De-Ballasting of Segregated Ballast, Preparation for Topping Off ,


Guidelines For Toxic Gases Hazards

HYDROCARBON VAPORS Characteristic ,Toxic Hazards of H.C. Vapors , HYDROGEN SULFIDE (H2S), H2S Gas Concentration, Precautions for Hydrogen Sulfide (H2S), Health Concerns in connection with Benzene, Health Concerns of Inert Gas, Oxygen-deficient atmosphere


Crude oil washing procedure

Supervision Of Crude Oil Washing (COW) Operations, Discharging Strategy ,Advance Notice In Port ,Safety Measures For Crude Oil Washing Operations , Confirming Atmosphere in Tanks to be Crude Oil Washed, Pressure Test


Standard Procedures for Tank Cleaning, Purging and Gas free Operation

Gas-Freeing for Cargo Tank entry ,Safety Precautions ,Non Flammable Atmosphere , Atmosphere Control during Tank Cleaning Operations ,Purging with Inert Gas (IG),Forced Air Ventilation


Matters that require attention while loading and discharging oil and ballast water

Control Of Discharge Of Oily Mixture Originating From Cargo Oil From Tankers & Restriction of carriage of oil and water ballast


Tanker vessel : Operations during laden voyage

Water And Cargo Oil Measurement, Vapor Control, Topping Up Operation, Cargo Oil Heating, Line Pressure Test


General Precautions Confirming Working Area Onboard Oil Tanker

Confirming Working Area, Anti-Electrostatic Clothes and Shoes for Ship’s crew, Permission of Hot Work ,Use of Explosion-proof Type Electric Torch equipment, Use of Hand Tools, Prohibition of Carrying Unnecessary Tools, Attention to Shock Sparks by Lighter Metals, handling of Aluminum Products


Preparation for discharge onboard oil tankers

Preparation of the Cargo Plan, Cargo Equipment, Cargo Oil Transfer Check Lists, Display of Warning Notices and Signs, Hose Connection, Cargo Oil Transfer Meetings with Terminal representative, Ullage measurement and Cargo Quantity Calculation, Lining up Pipelines and Valves


Oil Cargo Discharging Operations

Supply of I.G to cargo tanks being discharged, Line up of the IGS, Safety Confirmations and Clearance, Deck Watch and Personnel Arrangement


Tanker operation : Personnel for Cargo Handling

Watch Schedule, Supervision Of Operations, Personnel Arrangement During Cargo Operations


Measures For Handling Cargo Oil Having A Flash Point Exceeding 60c

Ensure that sufficient reliable evidence available that the flash point of the cargo oil is above 61° C and the temperature of the cargo oil does not exceed 5° C less than the flash point.


Tanker operation : Disposal for Spilled Oil and Prevention for Secondary Disaster

Tanker Standard Equipment For Disposal Of Spilled Oil & Secondary Disaster Prevention Slop Dump (Surface) Valve Arrangement (Emergency drains)


Tanker operation : Inspection Of Cargo Work Equipment And Machinery

The Chief Engineer and Chief Officer shall jointly be responsible for the inspection and maintenance of the cargo oil transfer equipment and machinery before entering port


Tanker operation : Measures For Pump room entry

Entry Permit into Enclosed Space ,Atmosphere Control, Effective communication ,Gas Monitoring , Maintenance Work in Pump Room





Tanker facts more


Oil tankers safety guideline for crude oil washing

Tanker vessel safety guideline - inert gas system

Tanker vessel safety guideline - gas freeing procedure

Precautions prior entering freezing zone - Check items in oil tankers operation

Tanker vessel safety guideline

Tanker vessel safety guideline - how to prevent oil spillage

Tanker vessel safety guideline - tank cleaning procedures

Bunkering procedure and related safety checklist

How to ensure safe working atmosphere onboard?

Tanker equipment and machinery

General precautions for tankers

Crude oil washing for tankers

General guidance for oil tankers

General precautions at work for tankers

(Latest edition)



Oil tanker more opeartional guideline

Oil pollution control method

Gas freeing arrangement for oil tanker

Handling guideline for oil cargo

Oil pollution prevention method

Preparation for loading oil cargo

How to prevent spillage of oil cargo

General precautions for oil cargo loading in tankers

General precautions for tankers

General guidances for tank cleaning

General precautions for ballasting procedure

Tanker operation in a laden voyage

Preparation for discharging oil cargo

General precautions for oil cargo discharging









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