American Petroleum Institute

SPECIFICATION FOR HIGH-TEST LINE PIPE - EIGHTEENTH EDITION; SUPP 1: April 1972
 N STD 5LX

Annotation

NOTE: The grade designations used herein comprise the letter X followed by the first two digits of the specified minimum yield strength.

Coverage. This specification covers high-test line pipe in grades X42, X46, X52, X56, X60, X65, and grades intermediate thereto. The chemical composition and certain physical properties of intermediate grades are subject to agreement between the purchaser and manufacturer. The agreed upon requirements must be consistent with the corresponding requirements for grades X42, X46, X52, X56, X60, and X65. Grade X60 or higher pipe shall not be substituted for pipe ordered for grade X52 and lower without purchaser approval.

Policy. American Petroleum Institute (API) specifications are published as an aid to procurement of standardized equipment and materials. These specifications are not intended to inhibit purchasers and producers from purchasing or producing products made to specifications other than API, and nothing in any API specification is intended to in any way inhibit the purchase of products from companies not authorized to use the API monogram.*

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API specifications 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 in them. However, the Institute makes no representation, warranty or guarantee in connection with the publication of any API specification 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 specification may conflict, or for the infringement of any patent resulting from the use of an API specification.