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Rena: a box ship, not a tanker (the clue's in the boxes on deck), being assisted by Awanuia, a tanker, not a box ship (the clue's in the pipes on deck) |
There’s a
maritime disaster, and you have to get a story out quickly. You have my
sympathy. It’s not an easy industry to grasp in a couple of hours, and I’m
surprised how few mistakes mainstream journalists make. But they still make
plenty, so I’m here to help you avoid some of them.
Just
because there's no passengers doesn’t mean it’s a tanker
The
supertanker boom of the early 1970s was news. First there were stories of ships
so big that their crews needed bicycles to get around and in one case even a
mini (the car, not the skirt). Later, the stories concentrated on the amount of
oil they spilled when they ran aground. Thereafter, people tended to assume
that all commercial ships were tankers, even if they were carrying coal.
Tanker: noun,
a ship, road vehicle, or aircraft for carrying liquids, especially mineral
oils, in bulk (
Oxforddictionaries.com)
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One captain toured his ship in a mini |
The
bicycles, by the way, were either dumped over the side or sold in the next port.
Imagine cycling on a sloping, moving, metal surface covered in oily water and
you’ll understand why.
Just
because it’s spilling oil doesn’t mean it’s a tanker
Most
powered vehicles carry oil of some sort, either as fuel or lubrication. Ships are no exception. Puncture one
in the right place, and oil will come out. The same is true of your car or a
Boeing 747. It’s only a tanker if it carries liquid as cargo, in bulk, in a
tank.
(Etymological aside: the British army in 1916
wanted to keep their new armoured vehicles a secret, so they told anyone who asked that those large, boxy
objects being carried to the front under tarpaulins were water tanks. They’ve
been called ‘tanks’ ever since.)
Just
because it’s a tanker doesn’t mean it’s a supertanker
Maritime
professionals frown on the term ‘supertanker’, but their own term, VLCC, isn't very attractive either. VLCC stands for ‘very large crude carrier’
and denotes a two-million-barrel ship, over 250,000 tonnes. There are also a
few ULCCs (work it out) over 350,000 tonnes.
The next
size below VLCC is the Suezmax (self-explanatory), over 120,000 tonnes. There
are very few tankers between 160,000 and 250,000 tonnes because refineries
don’t accept parcels of that size. You could just about call a Suezmax a
supertanker, but it isn’t one really.
Speaking
of ‘tonnes’…
Ships
don’t weigh anything
That
statement is obviously untrue. I mean that none of the ‘tonnages’ quoted for
ships relate to their weight. The two main measurements for commercial ships
are deadweight tonnes (dwt) and gross tons (gt). Note the different spellings
of tons/tonnes. Naval ships are measured in displacement (don’t call them
‘military ships’; milites is the
Latin for soldiers, whose theatre of
operations is definitely not the sea).
Gt is a
complicated measurement, but in simple terms it is a measurement of enclosed
space, having its origin in the medieval wine trade from France to England,
when ships were classified by how many tuns
(i.e. barrels) they could carry. It has nothing to do with a ship's weight, so even if your house style is 'tonnes' instead of 'tons', you can't turn gross tons into tonnes.
Dwt
measures how much weight the ship can carry (just like a 40-tonne lorry, which
doesn’t weigh 40 tonnes; it can carry 40 tonnes of cargo). Although dwt
includes fuel and people, on a cargo ship nearly all of it is cargo.
All ships
have certificates that specify their gt and dwt, but which is more informative
depends on the type of ship. If it’s a cargo ship, best quote the dwt.
…but use
a measurement that means something
Despite
the above, other measurements will sometimes be more useful to your readers. It
might be accurate to tell them the gt of a cruise ship, but saying how many
passengers it carries will mean more to them.
We’ve all seen maritime
containers being transported on the roads, so your readers will get a better
grasp of the size of a container ship if you say how many boxes it carries. Since
boxes come in two main sizes, 20-foot and 40-foot, the figure is usually quoted
in ‘teu’ (twenty-foot-equivalent units, so a 40-foot container is 2 teu). Make sure to check whether your source is talking about teu or number of boxes.
Oil
spills aren’t measured in gallons, and what’s a gallon anyway?
The
shipping industry measures oil in tonnes – that is 1,000 kilos. If your readers
prefer imperial tons, it’s easiest to convert 1:1. The difference is minimal,
and it’s almost impossible to measure an oil spill accurately anyway (short
tons – 907 kilos – are mainly used for dry cargo and seldom outside the US).
There are
about 6½ barrels in a tonne, but it depends on the type of oil. A tonne of West Texas Intermediate, the US benchmark crude, is 7.33 barrels. Many papers blithely quote ‘gallons’ without specifying that US gallons are 20%
smaller than imperial gallons. It all leads to the conclusion that some
writers don’t know or care what the numbers mean.
This
piece from AP (
http://www.guardian.co.uk/world/feedarticle/9889220) shows a
journalist or subeditor getting into a right tangle with their conversions, apparently converting metric tonnes into short tons and then long tons.
Sadly, these things are not always checked thoroughly before publication. That
begs the question, if the numbers mean nothing to the journalist, the subeditor
or the editor, why should they mean anything to the reader? So why are they in the story at all?
Exxon Valdez wasn’t the worst oil spill ever
As I
said, it’s very difficult to measure an oil spill. If there’s a fire, some of
the oil will be burnt off and some will remain in the ship, whether it’s
wrecked or salvaged. But however you measure it, the most famous spill in the
past quarter century isn’t the biggest. In fact,
Exxon Valdez barely scrapes into the Top
40 (see the list at
itopf.com).
If we
wanted to measure the
importance of an
oil spill, we would need to measure the number of rich white people who got
upset about it, weighted according to income. As far as I know, nobody is
working on such an index. If they were,
Exxon
Valdez,
Erika and
Prestige would be much higher up the list
(our friends at
ITOPF will get you some of the way there), above the less well-known
Castillo de Bellver and
Atlantic Empress.
Titanic wasn’t the worst passenger-ship disaster
ever
Again,
the rule of ‘rich white people affected’ comes into play. The loss of 1,517
people a century ago was a tragedy, but it doesn’t compare to more recent
disasters such as
Le Joola (2002,
1,863 Senegalese) or
Doña Paz (1987,
over 4,000 Filipinos). If we include wartime casualties, the torpedoing of the
German refugee ship
Wilhelm Gustloff (
www.wilhelmgustloff.com)
in January 1945 holds the record at around 9,000 – six times the toll of the
Titanic.
Moral:
fact-checking isn’t easy on a deadline.