| 摘要 |
A tank (300) for storing gas is provided with a dye capsule layer (16) in cluding capsules containing dye or with a shock recording layer formed on th e outer surface of the tank body (10). The shock recording layer has, for ex ample, a heat-insulating material layer (14) formed on the outer surface of the tank body (10), having a heat-insulating function, and capable of holdin g deformation, a dye capsule layer (16) formed on the outer surface of the h eat-insulating layer and including capsules containing dye, and a dye absorb ing layer (18) formed on the outer surface of the dye capsule layer (16) and capable of absorbing dye. By a shock, the dye released from the dye capsule layer (16) is absorbed into a dye absorbing layer (18) of the tank. The dye exudes on the surface of the dye absorbing layer (18) and spreads. The degr ee of shock given to the tank (300) is estimated from the degree of spread o f the dye or the degree of density of the dye. |
