The main steam pipeline of a 300 MW unit sank.Through a thorough investigation of reasons such as unreasonable design of pipeline support and hanger,aging of support and hanger materials,non-standard installation of support and hanger,and pipeline wall thickness exceeding the design wall thickness,it was found that the main cause of pipeline sinking is the deviation and constancy of hanger load exceeding the design value.When the bearing capacity of the hanger is lower than the design load requirements,especially when the upper travel,it will cause the pipeline to fail to rise smoothly,and the macro phenomenon shown is that the cold and hot state indicator of the hanger has little change.And when the design load of the support hanger is less than the sum value of gravity load,pressure load,displacement load and other loads,the pipeline will slowly sink.The problem of pipeline subsidence is solved through scientific governance,so that the safe production of the unit can be guaranteed.
pipelinehangerstress analysissinkwall thicknessturbo-generator set
NETL
NSTL
万方数据
