The purpose of this specification is to provide standards for pipe suitable for use in conveying gas, water, and oil in both the oil and natural gas industries. Ferropipe applies this specification to both seamless and welded steel line pipe. Ferropipe supplies pipe with plain-ends, with ends suitable for threading as well as pipe with ends prepared for use with special couplings.
The American Petroleum Institute specification API 5L addresses seamless and welded steel line pipe for pipeline transportation systems in the petroleum and natural gas industries. API 5L is suitable for conveying gas, water, and oil.
Specifications for API 5L adhere to the International Organization for Standardization ISO 3183, standardizing pipeline transportation systems within the materials, equipment and offshore structures for natural gas, petroleum, and petrochemical industries.
Product Specification Level (PSL) AMERICAN PETROLEUM INSTITUTE has further divided the grades in accordance with the Product Specifications Levels (PSL) of technical requirements and therefore developed PSL 1 and PSL 2. Requirements that apply to only PSL 1 or only PSL 2 are designated. Whereas Requirements that are not designated to a specific PSL apply to both PSL 1 and PSL 2.
- PSL 1 is a standard quality for line pipe, These line pipe can be supplied in Grades A25 through X70.
- PSL 2 contains additional chemical, mechanical properties, and testing requirements, PSL 2 has mandatory requirements for carbon equivalent, notch toughness, maximum yield strength, and maximum tensile strength. These and other differences are summarized in Appendix J. These line pipe can be supplied in Grades B through X80.
Pipe manufactured as Grade X60 or higher shall not be substituted for pipe ordered as Grade X52 or lower without purchaser approval. followed by the first two digits of the specified minimum yield strength in U.S. Customary units.
The grades covered by this specification are the standard Grades A25, A, B, X42, X46, X52, X56, X60, X65, X70 and X80; and any intermediate grades (grades that are higher than X42, intermediate to two sequential standard grades, and agreed upon by the purchaser and manufacturer). PSL I pipe can be supplied in Grades A25 through X70. PSL 2 pipe can be supplied in Grades B through X80. Class II (CI II) steel is rephosphorized and probably has better threading properties than Class I (CI l). Because Class II (CI II) has higher phosphorus content than Class I (CI l), it may be somewhat more difficult to bend. Pipe manufactured as Grade X60 or higher shall not be substituted for pipe ordered as Grade X52 or lower without purchaser approval.
Pipe manufactured to ASTM106 Grade A or B are not interchangeable with API 5L. API 5l X grades have a more specific requirement as compared to API 5L. Rolled raw materials; weld repairs etc are not allowed due to high yield requirements. Apart from these general requirements, HIC, SOUR NACE compliance is a must due to combination of High Pressure and High temperature applications with toughness requirements.
The sizes used herein are dimensionless designations, which are derived from the specified outside diameter as measured in U.S. Customary units, and provide a convenient method of referencing pipe size within the text and tables (but not for order descriptions). Pipe sizes 23/8 and larger are expressed as integers and fractions; pipe sizes smaller than 23/8 are expressed to three decimal places. These sizes replace the “size designation” and the “nominal size designation” used in the previous edition of this specification. Users of this specification who are accustomed to specifying nominal sizes rather than 00 sizes are advised to familiarize themselves with these new size designations used in this specification, especially the usage in Tables 4, 5, and 6A.
PSL I pipe can be supplied in sizes ranging from 0.405 through 80. PSL 2 pipe can be supplied in sizes ranging from 4’/2 through 80. Dimensional requirements on threads and thread gages, stipulations on gagging practice, gage specifications and certification, as well as instruments and methods for inspection of threads are given in API Standard 5B and are applicable to threaded products covered by this specification. It includes plain-end, threaded-end, and belled-end pipe, as well as through-the-flow line (TFL) pipe, and pipe with ends prepared for use with special couplings.