API Spec 5LCP:2006 pdf download
API Spec 5LCP:2006 pdf download.Specification for Coiled Line Pipe.
5 Process of Manufacture and Material
5.1 PROCESS OF MANUFACTURE
Pipe furnished to this specification shall be welded as defined in 5.2.1.
5.2 TYPE OF 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 welding 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 he 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 he 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 tiller 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 healing them with a constricted arc between an electrode and the work- piece, or the electrode and a nozzle. Shielding is obtained from the hot ionized gas issuing from the torch, which may be supplemented by an auxiliary source of shielding gas. Shielding gas may be an inert gas or a mixture of gases. Pressure may or ma)’ not he used.
5.4.2.3 Gas Tungsten Arc Welding
An arc-welding process that produces coalescence of the metals by heating them with an arc between a single tungsten electrode at the work. Shielding is obtained from a gas. Pressure is not used, and a filler metal may or may not he used.
5.5 HEAT TREATMENT
The heat treating process shall he performed in accordance with a documented procedure. For all grades, the weld seam and the entire heat effected zone shall he heat treated so as to simulate a normalizing heat treatment (see note) followed by full body stress relief andJor temper, except that by agreement between the purchaser and the manufcturer, alternative heat treatments or combinations of heat treatment and chemical composition may he 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, hut 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 aii 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 I, except
that other chemical compositions may he furnished by agreement between the purchaser and the manufacturer
Columbium, vanadium, titanium, or combinations thereof may he 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 he used: however, caution should he exercised in determining the quantity that may he present for any particular size and thickness of pipe, because the addition of such otherwise desirable elements may alter pipe weldahility.
Note: For grades X52C through X65C, for each reduction of O.0l% below the specified maximum carbon content, an increase of O.05% above the specified maximum manganese content is permissible. tip to a maximum of 1.45% for X52C, 1.60% for grades higher than X52C, and lower than X7OC, and 2.00% for grade X7OC and higher.
