Response to the issue of fuse plug blockage
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I asked the spherical tank manufacturer, and they replied that those with fuses are sealed, while those without fuses are open. When the fuse link is heated, the fusible metal melts and a hole is formed. (Originally, our ventilation holes were designed to allow air circulation when the pillars get hot.) The fuse plug structure effectively prevents foreign objects, rainwater, and other impurities from entering the pillar cylinder, while still ensuring air circulation when heated. ）
A fusible plug is a material that can melt when heated, and it is typically used to seal holes in spherical tanks. When the spherical tank is heated, the metal of the fusible plug melts, opening a hole. Vent holes are designed to allow air to pass through when the pillars get hot. The fuse plug structure enables effective prevention of foreign objects, rainwater, and other impurities from entering the pillar cylinder, while still ensuring air circulation when heated. .