Talk:Oil tanker/Archive 3

Merge from double hulled tanker
I support the proposed merge from double hulled tanker. The subject is already addressed more extensively in this article. Viv Hamilton 10:36, 30 August 2007 (UTC)


 * I oppose the propose merge from double hulled tanker. Reason being: there are tankers that have double hulls that are not oil or petroleum tankers. For example, chemical tankers or product tankers or parcel tankers. Also, there are double hulled vessels that are not tankers - for example, the Pacific Pintail is a nuclear carrier - it's double hulled but carries nuclear material, not oil cheers Jimmec 09:09, 24 September 2007 (UTC)

About cost
the article says : "the cost of tanker transport amounts to only two or three U.S. cents per gallon". Hmmm. I think new and better data is needed. First, it does not say for what distance? 1000, 5000, 10000 km? I guess the cost is more or less linear with the distance. Second, the source quoted for the figure is from year 2001. Oil was at 20$ or so by this time. Transporting oil uses oil, so logically, the cost (well, the fuel fraction of the cost) have increased considerably. --Raminagrobis fr (talk) 14:52, 18 May 2008 (UTC)
 * On your first point, distance is already implicitly taken into account. On the second point, I agree: newer statistics are always desirable, but not always available.  Off the top of my head, I'd say bunker fuel costs are in the neighborhood of 20% of operating costs.  Multiply that part of the cost by 5x and the total cost doubles.  So, the final transportation cost would be 4 to 6 cents per gallon.  For better or worse, though, we have to wait for someone else to do the math before we can put it in Wikipedia. Cheers.    H aus Talk 11:19, 4 October 2008 (UTC)

Somebody deleted my factoid that one supertanker can supply all the oil consumed by Spain and England in one day. Why? That's not right. Raylopez99 (talk) 15:09, 26 October 2008 (UTC)

Barrels 'only carried one way'
What the heck does this mean? —Preceding unsigned comment added by 18.62.12.53 (talk) 14:57, 21 October 2010 (UTC)
 * If I could carry them that way, I wouldn't need talcum powder. Reworded.  Haus Talk 15:15, 21 October 2010 (UTC)

Megagrams
Absolutely no-one except an anonymous editor used megagrams as the unit for weighing tankers!  D b f i r s   12:07, 8 November 2008 (UTC)

Supertanker
Please, do not redirect Supertanker to this article. It makes a hell in iw. Not all supertankers must be necessarily oil tankers and not all oil tankers are obviously supertankers. Make a special article for Supertanker. It does not have to be a long one. Thank you very much! Miraceti (talk) 13:20, 30 December 2008 (UTC)

Engine pollution
Besides the possible pollution from spills, the gasoline engines also cause pollution (always). This, escpecially as they often run on less-refined oil, this btw is also the case with other large vessels. Add section info and add the same info in the other large vessel articles (container ships, bulk carriers, ...) —Preceding unsigned comment added by 91.182.175.116 (talk) 13:58, 30 July 2009 (UTC)

Miscellaneous
In the Ore-Bulk-oil Carried section, the link labeled "ballast voyages" linkes to sailing ballast, which does nothing to explain what a ballast voyage is. —Preceding unsigned comment added by 174.96.89.173 (talk) 18:08, 13 May 2010 (UTC)

How long does it take to fill one up ?
I'm curious as to how long, say for a small, or a medium, or large one. And come to think of it, how long it takes to empty her too. Days or weeks or months ? Thanks ? --Jerome Potts (talk) 02:02, 29 September 2010 (UTC)


 * There are several variables. Loading is generally quicker than unloading, because it uses shore-based pumps which can be arbitrarily large.  Unloading is almost always done by shipboard pumps.  Also, more viscous products (i.e. crude oil) are harder and slower to pump.  For example, one can expect that loading crude in Alaska is slower than in the Arabian Gulf, because colder product is more viscous.  One thing that is very variable is how many lines are being used.  If you're pumping through three 12-inch hoses, it will be approximately three times as fast as pumping through one 12-inch hose.  Another variable is "static head", roughly the pressure you are pumping against.  If you're pumping 5 miles uphill to a full tank, its slower than 500 yards to an empty tank.  All that said, a discharge of product (like gasoline) on a 30,000 DWT tanker might take 8-12 hours and a load would might take about 6 hours.  I've personally never has a discharge take more than 24-hours.  Cheers.  Haus Talk 02:35, 29 September 2010 (UTC)


 * Thanks a bunch. But lucky me, i am wondering about the handling of crude oil. So thanks for the detail on the factors that affect the operation, but perhaps we can look at it from another angle : how long do ship operators usually expect, and tolerate, a loading (of crude) to last ? For, say, a VLCC. Perhaps there is a rule of thumb somewhere, or an average ? --Jerome Potts (talk) 04:24, 29 September 2010 (UTC)


 * Your question got me curious, so I sent an e-mail in to an old VLCC skipper. I expect he'll say, on average, around a day.  In reality, the charterer and the port look at all the variables and come up with an estimation.  After an hour of moving cargo, the chief officer and port PIC compare their measured flow rates and amend the schedule.  The flow rates and ETC are generally re-calculated hourly after that.  If the port, the operator, or the charterer is responsible for the cargo operation taking longer than it should, monetary damages can be assessed.  Anyway, when I get a response to the e-mail, I'll post it here.  Cheers.  Haus Talk 05:07, 29 September 2010 (UTC)


 * Thanks ! This is definitely interesting. --Jerome Potts (talk) 23:22, 29 September 2010 (UTC)


 * The answer I got was "almost never more than 24 hours for a discharge." Keep in mind, though, there are probably a few terminals somewhere out there with bad conditions/design/technology where it takes longer, but a VLCC would be more likely to run between hi-tech ports.  Cheers.  Haus Talk 00:15, 30 September 2010 (UTC)


 * Thanks again. What i am after is an idea of time for a fill-up from an offshore rig ; this has been helpful. --Jerome Potts (talk) 18:21, 30 September 2010 (UTC)

Ligthering grain?
I have never heard of grain being carried on a tanker going for scrap as it would need far too much work to get the tanks clean enough for grain, far too much work to load the grain and far too much work to discharge the grain.

The picture looks like a gang of tank cleaners leaving the vessel — Preceding unsigned comment added by Thinfourth (talk • contribs) 17:22, 5 March 2011 (UTC)


 * You're right in that it was a tremendous amount of work on both ends of the trip. See File:Lightering-grain-from-tanker.JPG.  Haus Talk 03:41, 11 March 2011 (UTC)

How big are oil tankers?
In a very good oil tanker article, the very basic question of how big they are, was not answered. Talking LDT (light ton displacement) or empty weight displacement. I.e., manufactured weight.

72.34.126.89 (talk) 22:21, 22 July 2012 (UTC) mjfin 7/22/12

Irony?
The worldwide consumption of fuel was so great that it justified the introduction of the (oil)supertanker, yet it is (was) the most efficient means of motorized freight transport. It is difficult to find a link with a clear comparison.... still looking.
 * “….Overall, reported energy consumption levels for water are among the lowest of any transport mode: nothing carries more ton-km for fewer kJ than a fully loaded supertanker at its optimum cruise speed. But, lightly loaded small ships are not much more energy efficient than the other surface modes….” [ ENERGY USE IN THE TRANSPORT SECTOR Julie Fraser Shiva Swaminathan Louis S. Thompson (www.tgaassoc.com/documents/energy-text&figures-dec2007.pdf)]

Pete318 (talk) 17:42, 2 April 2013 (UTC)

Cost of transport of oil — distance?
Re efficiency the introduction says "Tankers move approximately 2,000,000,000 metric tons (2.2×109 short tons) of oil every year.[4][5] Second only to pipelines in terms of efficiency,[5] the average cost of oil transport by tanker amounts to only two or three United States cents per 1 US gallon (3.8 L).[5]"

Question: "2-3¢ per gallon" — over what distance? a nautical mile?

I haven't noticed repeated authority cites before (#5). I get the point but it seems confusing versus normal footnotes.

Doug123w (talk) 12:51, 22 April 2013 (UTC)

External links modified
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External links modified
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