6 Test liquid
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.288(87) – Performance Standard for Protective Coatings for Cargo Oil Tanks of Crude Oil Tankers – (Adopted on 14 May 2010) - Annex – Performance Standard for Protective Coatings for Cargo Oil Tanks of Crude Oil Tankers - Annex 1 – Test Procedures for Coating Qualification for Cargo Oil Tanks of Crude Oil Tankers - 6 Test liquid

6 Test liquid

 Crude oil is a complex chemical material which is not stable over time when stocked. Crude oils can also vary in composition over time. In addition the use of crude oil has proven to create practical and HSE barriers for the involved testing institutes. To overcome this, a model immersion liquid is used to simulate crude oil. The formulation of this crude oil model system is given below:

  • .1 start with distillate Marine Fuel, DMA Gradefootnote density at 15șC: maximum 890 kg/m3, viscosity of maximum 6 mm2/s at 40șC;

  • .2 add naphthenic acid up to an acid numberfootnote of 2.5 ± 0.1 mg KOH/g;

  • .3 add benzene/ toluene (1:1 ratio) up to a total of 8.0 ± 0.2% w/w of the DMA;

  • .4 add artificial seawaterfootnote up to a total of 5.0 ± 0.2% w/w to the mixture;

  • .5 add H2S dissolved in a liquid carrier (in order to get 5 ± 1 ppm w/w H2S in the total test liquid);

  • .6 thoroughly mix the above constituents immediately prior to use; and

  • .7 once the mixture is completed, it should be tested to confirm the mixture is compliant with the test mixture concentrations.

Note To prevent the risk of H2S release into the test facility, it is recommended to use a stock solution for steps 1 to 4, then fill the test containers and complete the test solution with steps 5 and 6.

Parent topic: Annex 1 – Test Procedures for Coating Qualification for Cargo Oil Tanks of Crude Oil Tankers
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