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This Concept Map, created with IHMC CmapTools, has information related to: cargo tank insulation, extruded polystyrene AKA styrofoam, water vapour to expand in volume normally low quality and physical properties affected by humidity, good insulation properties, light and inexpensive to produce but it is readily ignitable, Cargo Tank Insulation have the functions, styrofoam used in deck insulation and cold store floors, expanding polystyrene is a thermoplastic material, one pot foams (PUR) reacts with water vapour to expand in volume, functions to ensure the tempeture of the hull do not fall below minimum allowable design tempeture, Cargo Tank Insulation types of insulation Powdered Perlite, heat leakage into cargo and limit boil off, independent tanks Type 'A' have pratical difficulties not a popular insulatin type, Foam Types polyurethane (PUF), Foam Types polyisocyanurate (PIR), polyurethane (PUF) has two types rigid, rigid used in domestic refrigeration, industrial and commercial cold storage, polyurethane (PUF) has two types soft, domestic refrigeration, industrial and commercial cold storage have low thermal conductivity, thermoplastic material has a good insulation properties, light and inexpensive to produce, normal polyurethane but better fire resistance B1 rating, polyisocyanurate (PIR) similar properties as normal polyurethane