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Contents Contents ................................................................................................................................................... 2 Maritime New Zealand’s Position on Dispersants for Oil Spill Response ................................................ 3 Maritime NZ approved dispersants ................................................................................................... 3 Deciding whether to use dispersants ................................................................................................ 3 Window of opportunity ...................................................................................................................... 3 Areas where dispersant should not be applied ................................................................................. 3 Dispersant effectiveness ................................................................................................................... 3 Dispersant effectiveness in freshwater ..................................................................................... 4 Effectiveness test results of Maritime NZ dispersant stocks ..................................................... 4 Effectiveness test results of Maritime NZ dispersant stocks on NZ Crude Oils ........................ 5 Dispersant Application .............................................................................................................................. 5 Sea state ........................................................................................................................................... 5 Calm conditions ......................................................................................................................... 5 Rough conditions ...................................................................................................................... 5 Dispersant application options .......................................................................................................... 6 Backpacks ................................................................................................................................. 6 Vessel-based ............................................................................................................................ 6 Fixed-wind aircraft ..................................................................................................................... 6 Helicopter .................................................................................................................................. 6 Application rates ............................................................................................................................... 6 Telling when dispersion has occurred ....................................................................................... 7 Material Safety Data Sheets ..................................................................................................................... 9 Slickgone LTSW ........................................................................................................................ 9 Corexit 9527 ............................................................................................................................11 Corexit 9500 ............................................................................................................................18 OSR-LT ...................................................................................................................................25 Tergo 2-005 .............................................................................................................................42 National Marine Oil Spill Contingency Plan Page 2 of 45 Chapter 7 – Dispersants Use Issue 7 June 2012
Maritime New Zealand’s Position on Dispersants for Oil Spill Response It is the policy of Maritime New Zealand that no marine oil spill response option should be ruled out or limited in advance. This is particularly true for dispersants. Chemical dispersants are an important option which should always be considered in the most effective ‘first stage’ of a response strategy. Maritime NZ approved dispersants Only dispersants approved for use in New Zealand marine waters in accordance with the marine protection rules Part 132 (1998) can be considered for use. Dispersants currently approved for use in New Zealand are listed at the rear of this Chapter. Deciding whether to use dispersants Maritime NZ has developed “Guidelines for the Use of Oil Dispersants in New Zealand”. The guidelines provide the decision-making framework to reach and document dispersant decisions. Any consideration of dispersant use should follow the procedures described in the Guidelines. The Guidelines include information on: assessing environmental risk, whether dispersant use is appropriate, notification, assessing likely oil dispersion, determining dispersant availability, <strong>safety</strong>, determining effectiveness of applications, and response termination. Window of opportunity The window of opportunity is the estimated time period available during which chemical dispersants will effectively disperse oil into the water column. The window of opportunity will vary with different oil types, the conditions prevailing during a spill, the types of dispersant available, and the method of application. Areas where dispersant should not be applied All New Zealand marine waters are classified as pre-approved for dispersant use under the New Zealand Marine Oil Spill Response Strategy. However, there may be areas where it is unacceptable for dispersant to be used based on the pre spill analysis of net environmental benefit. Some of these areas are identified in Annex 4 (Sensitive Areas and Coastal Information) of the Regional Plans. Other areas, for example around intake structures, may be identified during the response process when there is more certainty about the volume and nature of the oils and resources at risk. Although Regional Marine Oil Spill Contingency Plan may designate areas where dispersant should not be used the National On-Scene Commander may direct that dispersants be used in such areas if they consider a net environmental benefit will accrue. Dispersant effectiveness Section 5 of the Guidelines for the use of Oil Spill Dispersant (Stevens 2006) describes the general properties of oils and their likely dispersibilty. However estimates of effectiveness based solely on oil properties are unreliable and direct assessment of the spilt oil should be used wherever possible. National Marine Oil Spill Contingency Plan Page 3 of 45 Chapter 7 – Dispersants Use Issue 7 June 2012
Page 1: National Oil Spill Contingency Plan
Page 5 and 6: - indicates not tested � Shading
Page 7 and 8: Telling when dispersion has occurre
Page 9 and 10: Material Safety Data Sheets Slickgo
Page 11 and 12: Corexit 9527 National Marine Oil Sp
Page 13 and 14: National Marine Oil Spill Contingen
Page 25 and 26: OSR-LT National Marine Oil Spill Co
Page 43 and 44: Notes For Medical Personnel Remove
Page 45: Code HSNO Classifications 3.1D,6.4A

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