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Welcome back to LNG4U — your briefing on the forces shaping the LNG market. We open with a perspective to help you stay ahead 🎓, then turn to the developments worth watching — from market signals 💰 to offshore activity 🚢. Let’s dive in.
🎓 LNGKnowledge
Some LNG ships have a Reliquefaction plant onboard to reliquify 💧 the natural boil off NBOG and return it to the cargo tanks instead of burn it 🔥 in their engines.
The principles of heat transfer, evaporation and condensation are applied in refrigeration systems. The below figure 👇 shows the operating cycle of simple shipboard refrigeration cycle on a fully refrigerated LPG carrier. While we will learn the basics of refrigeration on an LPG system, this will help build your understanding 📈for #LNG reliquefaction systems.
In a single stage compression reliquefaction cycle the boil-off vapours from the cargo tank are drawn off by the compressor and compressed. This compression process increases 📈 the pressure and temperature of the vapour, allowing it to be condensed against seawater in the condenser. The condensed liquid 💧is then flashed back to the tank via float expansion valve or a level control. The liquid/vapour mixture that is returned to the cargo tank is normally distributed by a spray rail to maximise the cooling effect within the tank.
Source : LNG Shipping Knowledge
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