Note 4
These aggressive cargoes can only be carried when the system post cured or hot cured.

Post Cure
may be obtained by:
A service period of 3 months with non-aggressive cargoes (without notes 4, 7, 8 and/or 11) or empty tanks. 

For double hull vessels this may be achieved by carrying a hot cargo such as lubricating oil, animal oil or vegetable oil in full cargo tanks at a constant temperature of 60 degrees centigrade for 5 days, or 50 degrees centigrade for 10 days.

For single hull vessels and areas in direct contact with seawater the curing is dependent on the seawater temperature. As detailed in the table below.
Sea Water
temperature in ºC
Minimum Hot Cargo
temperature in ºC
Minimum 
Time /  days

10

70

10     

10

85

  6     

20

60

10     

20

75

  6     

25

50

10     

25

65

  6     



Hot Cure may be obtained by:
Using hot (sea) water through the butterworth washing system. For more detailed information please see the Appendix of system sheet 3322.

For a hot cure it must be ensured that the entire coated surface has attained the minimum specified temperature/time requirements.
 
For transport of Methanol and Vinyl Acetate Monomer (VAM) in Sigma Phenguard coated tanks a hot cure is required.

After transport of cargoes with Note 4, the system must be restored to its original condition. This may be obtained by forced ventilation until the tank is in a steady state gas free condition
(guideline: 1% of the LEL - see Ventilation) followed by carriage of non-aggressive cargoes (without notes 4, 7, 8 and/or 11) or empty tanks for a period of at least 10 days.

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