The tanks are cleaned with a machine called a Butterworth or Gamajet. Regardless of the actual manufacturer they are almost universally called Butterworth Machines.
These machines shoot hot crude oil onto the sides of the tanks so that it washes the sediment down to be pumped out.
The tanks must be cleaned before they can be inspected, and before cargo of a different type is loaded.
get it from places like Africa who send it to UK in tanker ships along the sea
MR oil tanker actually refers to Medium Range Product Tanker which is between 42,000 dwt to 59,999 dwt. There are two categories of ships in the oil tanker industry. First are the Product tankers which transport refined petroleum products like gasoline, diesel, naphtha, aviation fuel, etc. Second are the Crude carriers which transport unrefined crude oil.
introduction of inert gas in inerted tank ...
The capacity of a tanker ship can vary significantly depending on its size and design. A typical crude oil tanker can hold anywhere from 500,000 to over 2 million barrels of oil. For example, very large crude carriers (VLCCs) usually have capacities around 1.9 million barrels. Smaller tanker ships, like Aframax or Suezmax, generally hold between 500,000 and 1 million barrels.
Tanker takes over
An oil tanker would be carrying crude oil, not refined product. So the answer would be zero.
a tanker
Yes.
Jahre Viking, crude oil tanker
crude
Pipelines are the safest way to transport fuel, oil, etc.
You call a ship that is built to transport oil a tanker.