MnrAq

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