当要求低的压降以及使用的流体可能填塞填料时就使用喷雾塔。
Spray towers are used when a low pressure drop is required and the fluids involved might plug a packed bed.
在第一次应用或涂底漆之前，较小的裂缝、孔及表面缺陷应采用浆、水混合填料或水泥浆和砌浆进行填塞及填充。
Minor cracks holes and surface defects shall be made good with exterior grade water-mixed filler or masonry cement before application of the primer or first coat of paint.
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