Principles of selection of pipe diameter, allowable length of tracing piping, allowable highness of baggy elbows as well as heat transfer packing paste were expounded.

• 阐述了需要采用蒸汽伴热的管道,伴热管直径、根数、允许长度和袋形弯允许高度等的合理确定,以及传热胶泥的使用。