scope:

Coverage. This recommended practice involves not only the selection of drill string members, but also the consideration of hole angle control, drilling fluids, weight and rotary speed, and other operational procedures.

Sections 2, 3, 4, and 5 provide a step-by-step procedure for selection of drill string members in normal, near-vertical holes. Sections 6, 7, 8, 9, and 12 are related to operating limitations which may reduce the normal capability of the drill string. Section 10 contains classification system for used drill pipe and used tubing work strings, and identification and inspection produces for other drill string members. Section 11 contains statement regarding welding on down hole tools. Section 13 covers the classification system for rock (roller) bits.

Policy. This API Recommended Practice may be used by anyone desiring to do so, and every effort has been made by the Institute to assure the accuracy and reliability of the data contained. However, the Institute makes no representation warranty, or guarantee in connection with the publication of any API recommended practice and hereby expressly disclaims any liability or responsibility for loss or damage resulting from their use for any violation of any federal state, or municipal regulation with which an API recommended practice may conflict, or for the infringement of any patent resulting from the use of an API recommended practice.