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前言本增补包括在1987年标准化会议上通过的,在Cire PS-1826中报导的,并经信函投票批准的,对API Spec7《旋转钻井设备规范》(第35版)的更改。第1页。按最新版本修改封面。第3页,前言。加上下述段落。本出版物的用户注意:这个出版物的部分内容是从以前的版变化而来的,在旁边使用一条粗线标记。在一些情况下,这些变化是有实质性的,而在另外一些情况下,该变化反映出较小的编辑调整。人们在旁边规定粗线标记作为一种辅助作法,为用户辨别从以前的版本变化而来的部分内容,但API标记不保证上述粗线标记的精度。
Preface This supplement includes changes to the API Spec7 “Rotating Drilling Equipment Code” (35th Edition), approved by letter of vote and reported in Cire PS-1826, adopted at the 1987 standardization meeting. page 1. Modify the cover according to the latest version. Page 3, Preface. Add the following paragraph. Note for users of this publication: Parts of this title have changed from the previous version, with a bold line next to it. In some cases, these changes are substantial, while in others, the changes reflect minor editorial adjustments. As a side-effect, thick lines are used as a secondary measure to allow users to discern portions of what has changed from previous versions, but API marks do not guarantee the accuracy of these bold lines.