Orkney Harbour Authority requires that certain vessels (primarily loaded tankers) navigating in the Hoxa Sound / Scapa Flow areas are escorted by tugs. The requirements are based on the quantity of pollutants carried and are outlined in the table below.
|Area*||Quantity of Pollutants||Number of Tugs||Mode|
|B||>15,000 tonnes||2||Minimum 1 active|
|B||>170,000 tonnes||3||Minimum 1 active|
|C||>170,000 tonnes||2||Minimum 1 active|
|*see map below (the above table also applies to LNG vessels).|
The master and pilot have the authority to dispense with a tug escort in area 'C' should they consider it appropriate. It is also recommended that ballasted tankers are accompanied by a tug escort as follows:
- Area A 1 tug standby
- Area B 1 tug on active mode
- Area C 1 tug on passive mode
For the purpose of tug escorts, a pollutant is defined as crude oil or heavy bunker fuel.
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