Liquefied gas storage tank and ship including same

A liquefied gas storage tank comprising:

• a wall configured to form a storage space for accommodating liquefied gas and having a dome formed on its upper surface for inflow and outflow of liquefied gas;
• a pump tower having an upper end fixed to the dome and provided with a pipe configured to load and unload the liquefied gas and a discharge pump configured to unload liquefied gas;
• and
• a lower rotary bearing portion provided on the wall forming a bottom of the storage space and configured to constrain a lower end of the pump tower,
• wherein the pump tower comprises an upper rotary bearing portion which is guided to have horizontal movement constrained while vertical movement is allowed by the lower rotary bearing portion,
• the lower rotary bearing portion comprises a fixed portion fixed to the wall to protrude inward from the wall and having a circular cross section, and a plurality of constraining portions which are radially disposed based on a vertical center and around the fixed portion, and provided side by side with the vertical center to constrain the upper rotary bearing portion, and
• the upper rotary bearing portion comprises a plurality of seating portions protruding downward of the pump tower so as to be inserted among the plurality of constraining surfaces and having a seating surface facing the constraining surface, and a reinforcing portion configured to connect the plurality of seating portions having the seating surfaces at each different angle.

A liquefied gas storage tank comprising:

• a wall configured to form a storage space for accommodating liquefied gas and having a dome formed on its upper surface for inflow and outflow of liquefied gas;
• a pump tower having an upper end fixed to the dome and provided with a pipe configured to load and unload the liquefied gas and a discharge pump configured to unload the liquefied gas;
• and
• a lower rotary bearing portion provided on the wall forming a bottom of the storage space, configured to constrain a lower end of the pump tower, and provided with a fuel pump configured to supply the liquefied gas to an engine,
• wherein the lower rotary bearing portion comprises:
• a constraining portion having a plurality of constraining surfaces which are radially disposed based on a vertical center and provided side by side with the vertical center to constrain a lower end of the pump tower;
• an extended portion extended in a direction away from the vertical center from the constraining portion;
• and
• a pump support fixed to the extended portion and configured to support the fuel pump.