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Tanker management : Operations during laden voyage

The daily operation of oil tankers involved many hazards. There are many check items that should be complied with to ensure a safe working atmosphere.

The Chief Officer shall manage cargo oil and carry out related operations.

Water And Cargo Oil Measurement

As following the Charterer’s instructions, measure water contained in the cargo and the quantity of cargo oil in each tank during voyage in calm waters.

Every day, during the loaded passage, the Levels (Ullage) and Temperatures (in case of heated cargo) of cargo shall be measured and recorded. Any unexpected change in such levels shall be reported. This check is to monitor for any increase or decrease and inflow of oil into other tanks due to valve leakage.

Vapor Control

When evolution of cargo vapors is significant in case of gassy / volatile cargoes, confirm complete maintaining of closure of openings. and normal operation of breather valves, and spray water over the deck for cooling as required to prevent vapor loss.

Topping Up Operation: On the contrary, when the pressure in tanks in negative to such the air, put Inert Gas into tanks to keep a proper internal pressure.

Throughout the loaded passage, until the discharge port, keep continuous record monitoring of the fixed IGS pressure recorder, in addition to wheel house record book. This record book can provide some pressure control and behavior estimation for further management of the cargo vapor control. Ambient atmospheric temperature and sea water temperature variations can differ.

Cargo Oil Heating

Heat tanks properly according to the Charterer’s instructions, if any.

The Chief Officer is responsible for monitoring the temperatures and will liaise with the Chief Engineer for the operation of the cargo heating system.

The Chief Engineer is responsible for the correct operation and adjustment / maintenance of the cargo heating system. The boiler cascade tank shall be monitored regularly and alarms where fitted should be in good operational condition.

Chief Engineer also should consider extra Fuel Consumption for heating cargo.

Cargo heating Plan

1) Prepare a suitable heating plan & maintain/monitor heating record

2) Consider the following factors when preparing the heating plan:

> Adjacent Cargo / Ballast tank temperatures and condition (loaded/empty)

> Ambient air temperature, sea condition & spray on deck, causing cooling effect on heated cargoes

(3) Condition & technical limitations of steam coils / lines with respect to:

> Steam trap blockages

> Limitation of machinery & equipment design

> Selection of first discharging tanks

(4) Adjustment of steam valves based on daily cargo tank temperature record

(5) Steam Main Line Pressure and the number / degree of opening of steam valve to cargo tanks (recorded in “Heating Record”).

(6) Additionally when high cargo temperatures are to be attained:

i. Design & structural limitations and capability of cargo steam heating system

ii. In case of vapor segregation, rapid rise in temperature could lead to high I.G/vapor pressure build up inside tanks (Limitation – IN PORT)

Inform the company / operator promptly in case of such temperature discrepancy.

Line Pressure Test

Conduct a pressure test of cargo lines, COW lines and cargo valves using cargo oil before entering port to check for leak.

Double Hull (D/H) Operation / Oil Tank (COT) Monitring Records

Monitoring of Ballast tanks for Hydro carbon / H2S and Leakage / Ingress of Oil is to be carried out after loading- for three continuous days and thereafter, weekly.




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