In this study, steel welding single disk IFR arranged with the penetrating damage to the body and partial loss in the rim seal system has been designed as the experimental model at the diameter of 4.7 m according to API Pub 2021A-1998 and API 653, in order to simulate its most adverse situation in the real fire. The large-scale fire experiment has been conducted for the model, so as to investigate the fire development and burning behavior of the IFR, and further determine its structural defect and the optimizing strategy in fire. Fire process and temperature rise of the IFR model have been recorded and monitored as a function of time. Influence of the corrective measures on the fire behavior of IFR has been also analyzed and discussed here. Para-full surface fire has been first discovered and proposed to describe the characteristic burning behavior of this IFR. The results indicate that the traditional model exhibits para-full surface fire in the tank after 20min with the highest maximum temperature rise of 958 °C at 1050s, while the modified model with the corrective measures could prohibit the occurrence of para-full surface fire, restrict the temperature rise of the body and its surroundings below 900 °C, and stop the spread of fire in the storage tank for a period of 2 h, which is 6.0 times higher than the traditional model. And the related optimizing strategy has been proposed for the traditional steel welding single disk IFR in design and use.
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