Tank and method of manufacturing the same

1. A tank comprising:

a liner that includes a barrel portion having a cylindrical shape and a pair of dome portions provided at both ends of the barrel portion in an axial direction; and

a reinforcing layer that covers the liner and that includes a fiber reinforced resin formed by impregnating a fiber bundle with a resin, wherein

a portion of the reinforcing layer that covers the dome portions includes a radial arrangement layer in which fibers of the fiber bundle are arranged radially along a radial direction of the dome portions when seen in a direction of an axis of the tank,

the reinforcing layer includes

a circumferential arrangement layer that covers the barrel portion and in which fibers of the fiber bundle are arranged in a circumferential direction of the tank, and

a helical layer that covers the circumferential arrangement layer and the dome portions,

the radial arrangement layer is disposed on an outer side of a portion of the helical layer that covers the dome portions, and

a total length of the radial arrangement layer in the direction of the axis of the tank is shorter than a length of the tank in the direction of the axis of the tank.

2. The tank according to claim 1 , wherein a protector is disposed on an outer side of the radial arrangement layer.

3. A method of manufacturing a tank, comprising:

forming a liner that includes a barrel portion having a cylindrical shape and a pair of dome portions provided at both ends of the barrel portion in an axial direction; and

forming a reinforcing layer that covers the liner using a fiber reinforced resin formed by impregnating a fiber bundle with a resin, wherein

the forming of the reinforcing layer includes forming a radial arrangement layer on an outer side of the dome portions, in which fibers of the fiber bundle are arranged radially along a radial direction of the dome portions when seen in an axial direction of the tank,

the forming of the reinforcing layer includes

forming a circumferential arrangement layer that covers the barrel portion and in which fibers of the fiber bundle are arranged in a circumferential direction of the tank, and

forming a helical layer that covers the circumferential arrangement layer and the dome portions,

the forming of the radial arrangement layer includes forming the radial arrangement layer on an outer side of the helical layer at positions to cover the dome portions, and

a total length of the radial arrangement layer in the direction of the axis of the tank is shorter than a length of the tank in the direction of the axis of the tank.

4. The method of manufacturing a tank according to claim 3 , wherein the radial arrangement layer is formed by a tape placement method.

5. The method of manufacturing a tank according to claim 4 , wherein the radial arrangement layer is formed by thermocompression bonding of tapes formed from the fiber reinforced resin.

6. The method of manufacturing a tank according to claim 3 , wherein:

the tank includes a protector disposed on an outer side of the radial arrangement layer; and

the forming of the radial arrangement layer includes

applying tapes formed from the fiber reinforced resin to an inner surface of the protector fabricated in advance, such that fibers of the fiber bundle are arranged radially along a radial direction of the dome portions when seen in a direction of an axis of the tank to be manufactured,

mounting the protector, to which the tapes have been applied, to an outer side of the liner, and

curing the resin with which the fiber bundle is impregnated.