dry riser meaning in English

干式竖管
干式消防立管
消防干上水喉

Fire hydrant systems equipment - specification for landing valves for dry risers
消防栓系统设备.第2部分:干式水嘴接地阀规范
Fire hydrant systems equipment - specification for inlet breechings for dry riser inlets
消防栓系统设备.第3部分:干式水进口用进水支管规范
Fire hydrant systems equipment - specification for boxes for landing valves for dry risers
消防栓系统设备.第4部分:干式水嘴用接地阀箱规范
Fire hydrant systems equipment - specification for boxes for foam inlets and dry riser inlets
消防栓系统设备.第5部分:泡沫入口及干式水嘴用箱规范