旋转emergency shut-off solution protects pipelines on motorway bridge
The Sundsvall Bridge in northern Sweden carries the European Route E4 motorway, spanning a coastal cove to bypass the city of Sundsvall. Opened in 2014, the 2.1 kilometre bridge also carries two 400 mm diameter district heating pipelines which are now protected by an emergency shut-off system incorporating Rotork pneumatic actuators.
需要快速可靠的关闭解决方案在桥的两侧，以确保如果其中一根管道在桥梁内部破裂，则不会造成损坏。为了满足这一要求，旋转船提供了GP，RCG和RC200 Scotch-oke执行器和控制面板。弹簧返回的重型GP执行器安装在桥梁两端的主管道上安装的DN400球阀上。在紧急情况下，这些执行器将在一秒钟内关闭阀门。为了减少主线的应变，在主管道球阀周围安装了旁路线。旁路线上的阀装有RC260紧凑的双作用执行器。这些执行器上的速度限制器将其阀门关闭时间增加到40秒，从而最大程度地减少了紧急关闭期间管道系统中过度水锤的风险。
In addition to the emergency shut-off valves, four valves are installed on each side of the bridge to control the routine flow of water. These are fitted with compact double-acting RCG100 actuators on the main lines and RC260 actuators on the bypass lines.