摘要：A method of predicting design pressure and burn-through of in-service welding pipes was established. Temperature distributions of in-service welding under variable parameters were simulated by FEM. The effect of flowing of internal media was regarded as forced co.vection. Based on the numerical results, design pressure of the pipe can be obtained and burn-through can be predicted. It can be co.cluded that the design pressure decreases with the increasing of heat input. RSF and design pressure of the pipe increase with the increasing of flow rate. There is a range in which the increase changes greatly. For in-service welding, the range should be co.sidered adequately to determine operating co.dition optimally. RSF increases with the increasing of pipe wall thickness. While the thickness increases to an extent, RSF shows little increase. Acco.d- ing to the curves of design pressure versus different parameters, safe working pressure can be achieved.