scope:

FOREWORD

This specification was prepared by a formulating committee on which were representatives of the American Petroleum Institute, the American Gas Association, the Pipe Line Contractors Association, the American Welding Society, the Society for Non-destructive Testing, and representatives of the pipe manufacturers and individuals associated with related industries.

It is the purpose of this specification to produce the highest quality welds obtainable on a commercial basis by skilled welders, using approved welding procedures, materials, and equipment. It is also the purpose of this specification to produce the highest quality radio-graphs obtainable by skilled operators, using approved technique and equipment, to ensure the proper analysis of welding quality and defects.

This specification is intended to apply to cross-country pipe lines for the transmission of crude petroleum, petroleum products, and natural gas.

The committee has had the cooperation of many engineers interested in design, construction, and operation of oil and gas pipe lines, and desires to express appreciation for their wholehearted and valuable assistance.

It is realized that revisions will be necessary from time to time to keep abreast of developments, and constructive suggestions will be welcome.

Publication of the specification presented herein has been authorized by the American Petroleum Institute and the American Gas Association.