Table 6 Design conditions for water cannon robots
Item | Value | Rationale for setting |
|---|---|---|
Radiant heat intensity received by the robot | 20 kW/m2 | The radiant heat for the largest oil tank fire, as assumed in “Radiant heat intensity in a petrochemical complex fire” section |
Ambient temperature | 45 °C | Assumed as the highest temperature under the scorching midsummer sun in Japan |
Heat receiving and radiating area of the radiant heat-resistant exterior cover | 3.71 m2 | Assuming irradiation from an oblique direction where the projected area of the robot is maximized [the robot’s outline: (W) 1.4 m, (L) 2 m, (H) 1 m] |
Internal heat generation of the robot | 3.6 kW | Assume that 20% of the power consumed by the motor driver and 100% of the power consumed by others is dissipated as heat. The total internal heat generation of the actual water cannon robot is about 3.6 kW |
Water cannon robot internal temperature target | 60 °C or less | Select equipment that can withstand 60 °C as a design specification for the water cannon robot |
Cross-section and length of radiant heat-resistant exterior fixing fitting | (W) 40 mm (H) 3 mm (L) 50 mm Qty 17 pcs | From the actual shape and number of fittings |