B30。18适用于手动和电动桥式起重机和龙门起重机的施工、安装、操作、检查和维护，这些起重机具有顶部或底部运行的多梁桥，带有垂直导向小车，带有或不带有顶部或底部运行的小车。本卷中的要求也适用于具有相同基本特性的堆垛机，如悬臂龙门和半龙门堆垛机。

B30.18 applies to the construction, installation, operation, inspection, and maintenance of hand-powered and power-driven overhead and gantry cranes that have a top or under running multiple girder bridge with a vertically guided carriage, with or without a top or under running trolley. The requirements included in this volume also apply to stacker cranes having the same fundamental characteristics, such as cantilever gantry and semi-gantry stacker cranes.