Feature 2 | dIEsEl And gAs tEchnology
Ships’ emissions reach crucial stage
International Maritime Organization delegations respond to a detailed expert
working group report on new limits for air emissions from ships. Aline De
Bievre, Shipping Research and Reporting, London, UK, investigates.
L
ater this month, the International
Maritime Organization is expected Calculation assessment Result 2007 Result 2020
to approve a set of comprehensive Mill tonnes Mill tonnes
amendments revising the air pollution
annex of the Marine Pollution Convention Total fuel consumption by ships 369 486
(MARPOL Annex VI) and the associated HFO consumption by ships 286 382
mandatory Technical Code governing Marine distillate consumption by ships 83 104
nitrogen oxide emissions from ships’ CO
2
emissions from ships 1120 1475
diesel engines (NOx Technical Code). CO
2
emission reductions for a 0.5% S
The work done by the air pollution Marine distillate global cap - 43 - 59
working group last month, at the Total SOx emission from ships 16.2 22.7
12th session of the Sub-committee on SOx emission reduced by current SECAs - 0.78 *
Bulk Liquids and Gases (BLG12, 4-8 SOx emission reductions for a 0.5% S
February 2007), led IMO secretary- marine distillate global cap - 12.7 - 17.8
general Efthimios Mitropoulos to express SOx emission reductions in a multiple SECA
confidence that approval by consensus is environment with a 0.5% marine distillate
within reach of the Marine Environment SECA cap * -3.4
Protection Committee (MEPC). SOx emission reductions in a multiple SECA
Following approval of the draft environment with a 0.1% marine distillate
amendments at the MEPC’s 57th session, SECA cap * -3.7
scheduled for 31 March-4 April 2008, NOx emissions from ships 25.8 34.2
MARPOL contracting parties will be PM10 emissions from ships 1.8 2.4
invited formally to adopt the two revised PM10 emission reductions for a 0.5% S
instruments at an expanded session of Marine distillate global cap - 1.5 - 2.0
the 58th MEPC, 6-10 October 2008.
Entry into force is envisaged 16 months Table 1: Calculated emissions from ships in 2007 and 2020.
later, in March 2010, subject to the tacit
amendment procedure.
Figure 1: Evolution of refinery product slate (IEA, 2007).
The question remains, however, whether
the IMO will succeed in persuading
politicians and indeed the wider public
that it is in the avant-garde of preserving
a clean air environment for future
generations.
That the revision work is both necessary
and timely has never been in doubt. After
almost a decade of debate, the conference
had to compromise heavily on the
critical emission standards - both under
Annex VI and the NOx Technical Code
- that were well below existing technical
capability. Moreover, entry-into-force
took until May 2005.
Perhaps not surprisingly, many of the
hurdles that the present revision work has
had to address are similar to those the IMO
had to overcome when it developed the
original two instruments in the 1990s.
The Naval Architect March 2008 39
NA Mar 08 - p39+40+43+
45.indd 39 11/03/2008 14:15:01
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