A级工况条件是:连续运行,自吸排污泵,吸程、流量、扬程三项性能均需达标(选定型号的规定标准); B级工况条件是:连续运行,100WFB-E自吸排污泵,三项性能只需两项达标; C级工况条件是:间隔运行,三项性能只需一项达标;350WFB-AD2无密封自吸泵,350WFB-AD3无密封自吸泵,350WFB-AD4无密封自吸泵,350WFB-B无密封自吸泵,350WFB-B1无密封自吸泵,350WF