Coiled pipe heater is one of the main heat exchangers in chemical works. Replacing coil is related to the definition of the mold diameter and the elimination of the winding stress.
盘管式加热器是化工厂的主要换热设备之一，其盘管的更换主要涉及胎具直径的确定和弯曲应力的消除。
2
The fire work technology of soil blocking and vapour replacing for pipe maintenance is introduced in the paper.