HATCH CONSTRUCTION IN A LOW TEMPERATURE LIQUID TANK

摘要

A hatch construction in a low temperature liquid tank having a heat insulating layer inside a tank shell, characterized in that a hatch dome having a cover and inside an inner heat insulating layer is adapted for upward and downward movement slidably through an opening formed in the top wall of said tank shell, said hatch dome being carried by supports on the upper surface of the top wall of the tank shell, and a heat insulating seal means is provided for airtightly coating a space between the hatch dome and the peripheral part of said opening.