API Spec 7-2《旋转台肩式螺纹连接的加工与测量》讨论

Discussion on Fist Edition of API Spec 7-2

介绍API Spec 7-2第1版和API Spec 7第40版的螺纹加工和测量部分在基本尺寸、低扭矩结构、紧密距公差上的差异;分析API Spec 7-2第1版新增加的基准标记、其它旋转台肩式连接、计算等内容;讨论这些变化对螺纹加工和测量的影响;指出API Spec 7-2第1版的技术错误、编辑错误和一些不足,并给出修改意见。

The difference of overall dimensions,low-torque features,stand-off tolerances on threading and gauging between API Spec 7-2,1st edition,and API Spec 7,40th edition is introduced.The benchmarks,other rotary shouldered connections,calculation and other contents in API Spec 7-2,are analyzed in fisrt edifien.The impact of these changes on threading and gauging is discussed.The technical errors,editorial errors and some imperfections of the API Spec 7-2,1st edition are mentioned,then the modify suggestions are proposed.