How are the qualification levels of gantry crane manufacturers divided？first先要了解Portal crane manufacturer都需要什么资质？I won't say much about the three certificates，Portal crane manufacturer生产Gantry crane必须要有Gantry crane生产资质（Special Equipment Manufacturing License）、Gantry crane安装service改造许可证（Special Equipment Installation, Maintenance, and Renovation License），而且Portal crane manufacturer资质是分level别的，这也是Portal crane manufacturer实力最有力的证明。

生产Gantry crane资质和Gantry crane安装service改造level别同样有Alevel、Blevel、Clevel三类，这三类level别是有特种设备管理所定制，详见“crane械特种设备安装service资质分level”、“crane械特种设备制造资质分level”。AlevelGantry crane生产资质可以生产65ton以上Gantry crane，BlevelGantry crane生产资质可以10ton-65Ton gantry crane，ClevelGantry crane生产资质可以生产0.5ton-10Ton gantry crane。AQualification for installation, maintenance, and renovation of gantry cranes，在安装、service、改造Gantry crane上不做限制。BQualification for installation, maintenance, and renovation of gantry cranes，只能做额定起重量不大于80t、跨度不大于34.5m，CQualification for installation, maintenance, and renovation of gantry cranes，可参与额定起重量不大于20t、跨度不大于22.5mproject。


You can also refer to the above introduction when purchasing a gantry crane，bridge crane生产资质、Gantry crane生产资质、旋臂crane生产资质都需要查看，有实力的Portal crane manufacturer都具备crane各项ALevel Qualification，而小Gantry crane厂或小作坊一般都没有资质或CLevel Qualification，Because the qualification application for gantry cranes not only measures the actual production of gantry cranes，还要检测生产设备，生产环境等各项指标。

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