近期本人负责了分公司铆工操作技能的理论培训工作 ,针对培训中学员提出的关于三通管马鞍长度计算及放样展开问题进行了小结 ,在此提出来请有关专家及专业人士指正。1　问题的提出原石油工业部《管工操作规程》(ＳＹＢ - 4 10 4 - 80 )管件制作一节中 ,给出了求马鞍长度 (最长 Recently, I was responsible for the theoretical training of riveting work skills of branch companies, and summarized the calculation of the saddle length of the tee pipe and the setting-out of the lofting problems raised by the trainees in the training. The experts and professionals are hereby requested to correct me. 1 PROBLEM PROBLEMS In the section on pipe fittings made by the former Ministry of Petroleum Industry, “Rules and Regulations for Work of Pipe Workers” (SYB - 4 10 4 - 80), the length of the saddle