The 'Deck Seal' and 'Non-Return Valve' are automatic and manual devices to prevent backflow. Backflow of gas could result in CH gas from the cargo tanks reaching the boiler, leading to an explosion.
Tanker takes over
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.
Jahre Viking, crude oil tanker
An oil tanker would be carrying crude oil, not refined product. So the answer would be zero.
get it from places like Africa who send it to UK in tanker ships along the sea
Pipelines are the safest way to transport fuel, oil, etc.
Wet barrels of crude oil is transacted denominations of 500,000 barrels, approximately the cargo capacity of a large tanker.
This is a simple problem. Just take 34,700,000 and divide by 4 to get the answer, 8,675,000 gallons.
I have included a number of links. The chief advantage is it is the most economical way of transporting large volumes of oil from the area of production to refineries, which then transport the refined petroleum products to consumers. It is frequently the only practical means of transporting crude oil, in locations, where the local market is insufficient and there are no alternatives (pipeline to markets do not exist). Secondly, tankers are convenient, since they have a number of compartments, whereby they can make a number of pick-ups (liftings) and deliveries. Third, transportation by tanker is convenient since a large tanker fleet exists to transport crude oil. The disadvantages: Potential for accidents and oil spillage. Since the Exxon-Valdez accident, there has been considerable concern about tanker spills. I have included related links on tanker accidents. Note that it appears that there has been over the last 40 years, a decrease in large accidents. Some oil may accidently spill during loading. The tanker in some cases may not be the most economical means. If oil is found where the discovery can easily be tied into an existing pipeline, shipment of crude by tanker may be less economical. You can find more information in the related links.
A container ship carries packet containers that can be loaded or unloaded directly for rail , road or air transport.Tankers carry liquid products such as oil, crude petroleum etc.
To make a compound more stable at storage temperature
Oil tankers vary in size by a huge margin, from a few thousand tonnes DWT to 500,000 tonnes DWT. The density of crude oil also varies, averaging around 0.7 kgs per litre. There are 159 ltrs (apprx) per barrel. From this you can calculate how much each type can carry.