During a company audit it was noticed that the deck tanks used for ammonia storage had been loaded up to 98% at a loading temperature of -22°C. The expected ambient temperature later in the voyage was 20°C.
Deck tanks are high pressure vessels that require strict adherence to the cargo manual. In the case described above, the deck tanks should have been loaded to 89.5% to allow for increased pressure when ambient temperatures increased.
Further inquiries identified that the cargo manuals had the...
https://www.marineinsight.com/case-studies/real-life-incident-deck-tank-overloaded/