API 5LD:1998 pdf download.Specification for CRA Clad or Lined Steel Pipe
1 Scope
1.1 COVERAGE
This specification covers seamless, centrifugal cast, and welded clad steel line pipe and lined steel pipe with improved corrosion resistant properties. The clad and lined steel line pipe specified herein shall be composed of a base metal out- side and a corrosion-resistant alloy (CRA) layer inside the pipe. The base material shall conform to API Spec 5L except as modified herein. The primary product has square ends, but other special end preparation may be furnished by agreement between the pur- chaser and manufacturer. Included are NPS: 1 in. through 42 in. Grades of base metal covered by this specification are X42, X46, X52, X56, X60, X65, X70 and X80 and grades interme- diate to these. Grades of the CRA layer are LC 1812, 2205, 2506, 2242, and 2262 and other grades which are subject to agreement between the purchaser and the manufacturer.
1.2 GENERAL
a. This specification is under the jurisdiction of the Commit- tee on Standardization of Tubular Goods. b. The purpose of this specification is to provide standards for pipe with improved corrosion resistance suitable for use in conveying gas, water, and oil in both the oil and natural gas industries. c. Although the plain-end line pipe meeting this specification is primarily intended for field makeup by circumferential welding, the manufacturer will not assume responsibility for field welding. d. The size designations are nominal pipe sizes. In the text paragraphs herein, where pipe size limits (or size ranges) are given, these are outside-diameter sizes except where stated to be nominal. These outside-diameter size limits and ranges apply also to the corresponding nominal sizes.
4 Process of Manufacture and Material
4.1 PROCESS OF MANUFACTURE Clad or lined steel pipe furnished to this specification shall be seamless, welded, or centrifugally-cast steel pipe, clad or lined, as defined below. a. CRA Layer 1. Clad. Clad steel pipe is a bimetallic pipe composed of an internal CRA layer metallurgically bonded to the base metal. 2. Lined. Lined pipe is pipe in which a CRA layer is affixed inside the carbon steel pipe full length by expand- ing the liner and/or shrinking the pipe, or by other applicable processes. The CRA layer and the carbon steel pipe shall be manufactured in accordance with Spec 5LC and Spec 5L, respectively, except as may be otherwise specified, herein. b. Base Material for Clad Pipe 1. Seamless. Seamless clad pipe is produced by the seam- less process defined in Spec 5L, 2.1 or 5LC, 5.1 from composite material prepared by methods such as casting, explosion, pipe nesting, hot extrusion, powder metallurgy or other applicable processes. 2. Centrifugally-Cast. Centrifugally-cast clad pipe is pro- duced by the centrifugal casting process defined in Spec 5LC, 5.1.a.2. The entire inner surface of centrifugally- cast clad pipe shall be machined. The outer surface may be machined as well, when agreed upon between the pur- chaser and the manufacturer. 3. Welded. Welded clad pipe is produced from clad plate or skelp. The longitudinal seam of the tubular shape is welded by one of the welding processes as defined in Spec 5LC, 5.1.b, or their combination, except electric-weld, which is applicable only to the base metal of the carbon steel. For welded-with-filler metal, at least one pass shall be on the inside and one pass on the outside. Tack welds, if applied, shall be removed by machining or remelted by subsequent arc welding. Tack welds are not subject to the subsequent weld requirements of this specification. c. Base Material for Lined Pipe. The base material for lined pipe shall be produced in accordance with Spec 5L.