API Spec 5LCP-2006 pdf free download
API Spec 5LCP-2006 pdf free download.Specification for Coiled Line Pipe.
5.2.1 Electric Welded Pipe Electric welded pipe is defined as pipe having one longitudinal seam produced by the electric welding process defined in 5.4.1.1. 5.3 TYPES OF WELDS 5.3.1 Electric-Weld (Seam) An electric-weld is a longitudinal seam weld produced by the electric-welding process defined in 5.4.1.1. 5.3.2 Skelp End Weld A skelp end weld is a butt weld that joins skelp ends together. Skelp end welds shall be made in accordance with a qualified weld- ing procedure, using gas-metal arc welding, plasma-arc welding or gas tungsten arc welding. (See Appendix B). Skelp end welds shall be at right angles, or at an acute angle to the edges of the skelp. 5.3.3 Pipe-to-Pipe Weld A pipe-to-pipe weld is a circumferential butt weld that joins two pieces of pipe together. Pipe-to-pipe welds shall be made in accordance with a qualified welding procedure, using gas-metal arc welding, plasma-arc welding, gas tungsten arc welding, or a combination of such welding processes. (See Appendices A and B). 5.4 WELDING PROCESSES 5.4.1 Without Filler metal 5.4.1.1 Electric Welding A process of forming a seam by electric resistance or electric induction welding wherein the edges to be welded are mechanically pressed together and the heat for welding is generated by resistance to flow of electric current. 5.4.2 With Filler Metal Welds made with filler metals are for skelp-end welds and pipe-to-pipe welds only. 5.4.2.1 Gas Metal-Arc Welding A welding process that produces coalescence of metals by heating them with an arc or arcs between a continuous consumable electrode and the work. Shielding is obtained entirely from an externally supplied gas or gas mixture. Pressure is not used, and the filler metal is obtained from the electrode. 5.4.2.2 Plasma Arc Welding A welding process that produces coalescence of metals by heating them with a constricted arc between an electrode and the work- piece, or the electrode and a nozzle.
5.5 HEAT TREATMENT The heat treating process shall be performed in accordance with a documented procedure. For all grades, the weld seam and the entire heat effected zone shall be heat treated so as to simulate a normalizing heat treatment (see note) followed by full body stress relief and/or temper, except that by agreement between the purchaser and the manufacturer, alternative heat treatments or combi- nations of heat treatment and chemical composition may be substituted. Where such substitutions are made, the manufacturer shall demonstrate the effectiveness of the method selected using a procedure that is mutually agreed upon. This procedure may include, but is not necessarily limited to hardness testing, microstructural evaluation, and mechanical testing. Note: During the manufacture of electric-welded pipe, the product is in motion through the surrounding air. Normalizing is usually defined as “cooling in still air”, hence the phrase “to simulate a normalizing heat treatment” is used here. See 9.2.6 for applicable marking requirements. 5.6 TRACEABILITY The manufacturer shall establish and follow procedures for maintaining heat and master-coil identity until all required heat and master-coil tests are performed and conformance with specification requirements has been shown. 6 Material Requirements 6.1 CHEMICAL PROPERTIES 6.1.1 Chemical Composition The composition of pipe furnished to this specification, shall conform to the chemical requirements specified in Table 1, except that other chemical compositions may be furnished by agreement between the purchaser and the manufacturer Columbium, vanadium, titanium, or combinations thereof may be used at the discretion of the manufacturer. For all grades, by agreement between the purchaser and the manufacturer, element other than niobium (columbium) vanadium and titanium may be used; however, caution should be exercised in determining the quantity that may be present for any particular size and thickness of pipe
