API SPEC 5AC 1987 Edition, May 31, 1987
SPECIFICATION FOR RESTRICTED YIELD STRENGTH CASING AND TUBING (COMBINED WITH SPEC 5A, 5AX, AND 5AQ INTO SPEC 5CT-88)
Additional Comments: USE API SPEC 5CT (COMBNATN OF API 5A,5AC,5AX,5AQ)
Published By:American Petroleum Institute (API)
Coverage. This specification covers casing, tubing, and tubing pup joints (hereafter called pup joints) and connectors in the sizes and wall thicknesses applicable to the various grade of pipe as shown in the standard lists (Tables 1.1, 1.2 and 1.3), and the dimensional tables (Tables 6.1 through 6.6), including other sizes and weights of Grade C-90 casing and tubing as agreed upon between purchaser and manufacturer. †Two grades of martensitic chromium steels containing nominally 9% Cr - 1% Mo and 13% Cr are included. It also includes requirements for couplings and thread protectors. All requirements given herein for casing and tubing shall apply to pup joints and connectors except as otherwise specified. Connectors are defined as a tubular section used for the purpose of 1) joining or changing from one size, weight, or type of threaded connection to the same or another size, weight, or type of threaded connection or 2) other application.
Dimensional requirements on threads and thread gages, stipulations on gaging practice, gage specifications and certification as well as instruments and methods for inspection of threads are given in API Std 5B and are applicable to products covered by this specification.
American Petroleum Institute (API) Specifications are published as aids to the procurement of standardized equipment and materials, as well as, instructions to API Licensees. These Specifications are not intended to obviate the need for sound engineering, nor to inhibit in any way anyone from purchasing or producing products to other specifications.
The formulation and publication of API Specifications and the associated license program is not intended in any way to inhibit the purchase of products from companies not licensed to use the API monogram.
Nothing contained in any API Specification is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use in connection with any method, apparatus, or product covered by letters patent, nor as insuring anyone against liability for infringement of letters patent.
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The procedure for obtaining authorization to use the API monogram is given in Appendix E.
The martensitic chromium steels specified herein require considerable skill in their manufacture and processing. These steels may require different heat treating, threading, inspection, and anti-galling practices than those used for conventional carbon steel tubular.
†Note: The term, ?manufacturer? as used throughout this specification includes pipe mills, processors, threaders, and manufacturers of couplings, pup joints and connectors, as applicable.