Seagull AS

Specialized Training for Oil Tankers

Task 5

Task 5.

Name:

ID no:

This task no. 5 must be mailed or sent by fax to Seagull A/S. Put your answers in the envelope marked “Task 5” and mail it.

Question 5.1.

During discharging operation, the inert gas is replacing the discharged cargo. What is the requirement to the inert gas plant's capacity?

Answer:

Question 5.2.

What is the purpose of the scrubber?

Answer:

Question 5.3.

What is the most commonly used inert gas?

Question 5.4.

What is the dissolving effect depending on when crude oil washing?

Answer:

Question 5.5.

What is the required diameter to a crude oil washing line system?

Answer:

Question 5.6.

What is the requirement to number of drive units on vessels equipped with tank washing machines where the drive units are detachable?

Answer:

Question 5.7.

A tank's volume is 24,000m³. What is the maximum allowed oil on top of the departure ballast on a clean ballast tanker?

Answer:

Question 5.8.

During a crude oil washing operation an ejector is used for stripping. The stripping capacity to the ejector is 750m³/h at 9 bars. Each cow-machine has a delivery capacity of 105m³/h at 9 bars. How many cow-machines can be used simultaneously to fulfil the stripping regulations.

Answer:

Question 5.9.

What are IMO's requirements to oxygen content in the tank atmosphere during discharging?

Question 5.10.

What are IMO's requirements to oxygen content in supplied inert gas?

Answer:

Question 5.11.

A vessel's length is 266m (Lpp). What will be the vessel's maximum trim by stern on departure (according to Specification requirements)?

Answer:

Question 5.12.

What is the requirement with regard to number of inert gas blowers on a flue gas plant?

Answer:

Question 5.13.

What is the requirement to number of non-return devices to be fitted in the inert gas supply main?

Answer:

Question 5.14.

In connection with IG system, what type of device to be fitted on the navigation bridge?

Answer:

Question 5.15.

What is the purpose of crude oil washing?

Answer:

Question 5.16.

Why is cow more efficient than water washing?

Answer:

Question 5.17.

Why was COW made compulsory?

Answer:

Question 5.18.

Why is cow more efficient than water washing?

Answer:

Question 5.19.

Where shall the verification of submerged washing machines be recorded?

Answer:

Question 5.20.

What is the meaning of sludge control?

Answer:

Question 5.21.

What is the purpose of the small diameter line (MARPOL line)?

Answer:

Question 5.22.

How to avoid excessive electrostatic generation in the cargo tank, during COW, due to the presence of water in the crude oil washing fluid?

Answer:

Question 5.23.

What is the requirement regarding capacity of inert gas plant?

Answer:

Question 5.24.

What action must be taken in case of total failure of the IG plant during COW?

Answer:

Question 5.25.

What is the requirement to diameter of COW lines?

Answer:

Question 5.26.

Explain “multistage” washing.

Answer:

Question 5.27.

What is the requirement to size of the small diameter line for new oil tankers or existing oil tankers?

Answer:

Question 5.28.

Under which conditions are you allowed to carry out COW at sea?

Answer:

Question 5.29.

What are the training requirements for a person who shall have overall charge of COW?

Answer:

Question 5.30.

How has COW influenced the cargo out-turn?

Answer:

Practical task:

If you are on board a vessel this practical task must be done and mailed/sent to Seagull AS.

Participate in one COW operation and write a report on:

• The procedure to find the sequence of tanks to be washed.

• Necessary precautions to avoid high tank pressure during the operation.

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Author:	Kjell Vagtberg	Printed:	06.01.03
File name:	Task 5.doc	Version:
File created:	14.02.02	Approved by:
Last saved:	06.01.03	Approved date:

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