Third IMO Greenhouse Gas Study 2014
GHG3%20Executive%20Summary%20and%20Report
GHG3%20Executive%20Summary%20and%20Report
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Annex 1 171<br />
Ship class<br />
Capacity bin<br />
Auxiliary engine load (kW)<br />
At berth At anchorage Manoeuvring At sea<br />
Vehicle 0–+ 800 500 1,125 500<br />
4,000–+ 800 500 1,125 500<br />
Yacht 0–+ 130 130 130 130<br />
Service – tug 0–+ 50 50 50 50<br />
Miscellaneous – fishing 0–+ 200 200 200 200<br />
Offshore 0–+ 320 320 320 320<br />
Service – other 0–+ 220 220 220 220<br />
Miscellaneous – other 0–+ 190 190 190 190<br />
Similar to auxiliary engine loads, there is no commercial data source that provides information regarding<br />
auxiliary boiler loads by operational mode. Auxiliary boiler loads were developed using VBP data and based<br />
on the professional judgement of the members of the consortium. Auxiliary boiler loads are typically reported<br />
in tons of fuel per day, but these rates have been converted to kW (Starcrest, 2013). Boilers are used for various<br />
purposes on ships and their operational profile can change by mode. The following auxiliary boiler profiles<br />
were used for this study:<br />
• The study assumes that in at-sea operational mode, ships are meeting their steam requirements through<br />
economizers which scavenge heat from the main engine exhaust and use that heat to produce steam.<br />
There are exceptions to this assumption, with regards to tankers: we assumed, to be conservatively<br />
high, that boilers would be needed on oil tankers during at-sea operations to heat their cargo for the<br />
larger ship capacity bins (greater than 20,000 dwt).<br />
• The study assumes that liquefied gas carriers will have additional steam requirements during at-sea<br />
operations.<br />
• The study assumes that oil tankers and liquefied gas tankers will use steam plants to drive the cargo<br />
discharge pumps while at berth.<br />
• The study assumes that the “Ferry – pax only”, “Ferry – ro-pax” and non-cargo ship categories do not<br />
have boiler loads, consistent with the Second <strong>IMO</strong> GHG <strong>Study</strong> 2009.<br />
The auxiliary boiler loads by mode used in this study are presented in Table 9.<br />
Table 9 – Auxiliary boiler loads, by ship class and mode<br />
Ship class<br />
Capacity bin<br />
Auxiliary boiler load (kW)<br />
At berth At anchorage Manoeuvring At sea<br />
Bulk carrier 0–9,999 50 50 50 0<br />
10,000–34,999 50 50 50 0<br />
35,000–59,999 100 100 100 0<br />
60,000–99,999 200 200 200 0<br />
100,000–199,999 200 200 200 0<br />
200,000–+ 200 200 200 0<br />
Chemical tanker 0–4,999 125 125 125 0<br />
5,000–9,999 250 250 250 0<br />
10,000–19,999 250 250 250 0<br />
20,000–+ 250 250 250 0
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