本标准涵盖了石油、化工和天然气工业服务中连续工作的离心风机的最低要求。风机压力上升仅限于单个叶轮的压差，通常不超过100英寸的水当量空气压力（EAP）。冷却塔、空气冷却器和通风风扇；本标准不包括容积式鼓风机。

This standard covers the minimum requirements for centrifugal fans intended for continuous duty in petroleum, chemical, and gas industry services. Fan pressure rise is limited to differential from a single impeller, usually not exceeding 100 inches of water Equivalent Air Pressure (EAP). Cooling tower, aerial cooler, and ventilation fans; and positive displacement blowers are NOT covered by this standard.