Fig: HOLD damp with humidity after opening hatches
The next cargo after discharge of GDP was fixed for grain. Although considerable efforts were undertaken by the ships staff in cleaning the holds with the supplied chemicals the holds could not be presented in grain ready condition The stains could be partially removed only after a close up cleaning in the dry dock and painting of lower hopper areas.
It should be re-membered that because of the sulphur content of pet coke, not only cleaning but also corrosion might create problems. Rotation of such cargoes such as pet coke/coal and salt may give rapidly-attacking rust problems, even if the protective paint is considered to be in a good condition
Fig:HOLD condition after high pressure & Chemical wash
Vessel arrived at Argentinian port to Load grain and all holds were cleaned to grain standards, However on opening the hatch covers during the inspection it was observed that the hold was damp with humidity. The inspectors rejected the holds on the grounds that holds were not presented grain ready Ship sweat refers to condensation which forms directly on a vessels structure when the air within a hold, made warm and moist by the cargo or even when empty if closed with warm air inside, comes into contact with cold surfaces as the vessel moves into cooler climates or surfaces in contact with ballast tanks which are relatively cooler. Cargo may be damaged by overhead drips or even the hold becomes damp, by contact with sweat which has formed on the ships sides or by condensed water which may accumulate at the bottom of the hold.
Conclusion:
- If loading pet coke that stains, the loading stevedores should be advised not to aim the coke via the loading chute directly at the hold bulkheads. This will reduce the impact on the bulkheads and the amount of cleaning required. The best and most effective solution being application of Hold blocks prior the loading and this can be easily washed by high pressure cleaning
- Dew point Rule : VENTILATE if the dew point of the air inside the hold is higher than the dew point of the air outside the hold. DO NOT VENTILATE if the dew point of the air inside the hold is lower than the dew point of the air outside the hold
Related information
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Chief officers final inspection prior cargo hold survey
Maintenance procedure for mechanical steel hatch covers
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- Chief officers final inspection prior cargo hold survey
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