Secondary screen waLL of A type tank Liquefied gas vesseL

The invention provides a secondary screen waLL of an A type tank Liquefied gas vesseL. A cargo fence system of the A type tank Liquefied gas vesseL comprises an IMO A type Low-temperature prism Liquefied gas tank supported on a vesseL body and the integraL secondary screen waLL, a secondary screen waLL system is separated from and does not make contact with the Liquefied gas tank, and the area between the secondary screen waLL and the Liquefied gas tank serves as a maintenance space of the secondary screen waLL. The secondary screen waLL comprises an upper prefabricated heat-insuLating pLate Layer, a Lower prefabricated heat-insuLating pLate Layer and a Layer of compLete secondary screen waLL fiLm, the upper prefabricated heat-insuLating pLate Layer and the Lower prefabricated heat-insuLating pLate Layer are divided in advance to manufacture a pLuraLity of upper and Lower heat-insuLating pLates, and the center of each heat-insuLating pLate is fixed to a vesseL body structure through astainLess steeL screw rod