Cause analysis and treatment on main steam piping abnormal expansion in a 660 MW unit
In response to the abnormal thermal expansion displacement of the main steam pipeline in a certain power plant,pipe-line support and hanger status inspection,performance testing,and pipeline stress calculation were carried out.The impact of ab-normal support and hanger status on the stress distribution of the pipeline system was analyzed and compared with the pipeline stress under design conditions.It was found that the locking of the rotating mechanism of the constant force support and hanger has a significant impact on the secondary stress of the pipeline,with the maximum exceeding twice the design condition,seriously affecting the safe operation of the pipeline.Therefore,metal supervision and daily inspection of the pipeline should be strength-ened.Adjusting the status of supports and hangers can improve the stress distribution of pipelines and effectively solve the prob-lem of abnormal pipeline expansion caused by supports and hangers.
performance testingstress calculationsupport and hangermetal supervision
NETL
NSTL
万方数据
