API SPEC 2B:2007 pdf download
API SPEC 2B:2007 pdf download.Specification for the Fabrication of Structural Steel Pipe.
5 Fabrication
5.1 GENERAL
5.1.1 Forming pipe furnished to this specification shall norinally be fomied below 4(X)°F. that is. cold formed. Warm forming (between 800’F and I 2(X)° F or 50°F below thc tempering temperature ol quenched and tempered steels) may be employed provided kwTning procedures for heat treated or TMCP steel are qualified to demonstrate the mechanical strength properties required by the original plate specification are met in the warm fomied condition. Hot forming (above the upper critical temperature) may also be employed provided the forming procedure is qualified to demonstrate all mechanical properties required by the original plate specifications are met.
5.1.2 The purchaser may specify Supplementary Requirement I if the rolled direction of the plate is desired to be oriented in a specific direction during the forming of the pipe. and the pipe shall be so ide,nitied.
5.1.3 All welding shall he in accordance with AWS 1)1.1-
2000. Structural Welding Code—Steel. Unless otherwise approved by the purchaser, the submerged arc welding process shall be employed for all welding—except tack welds, root passes and repair welding where other AWS approved processes may be utilized. All welds shall be complete joint penetration groove welds produced by employing AWS Dl. prequalitied joint details, or other joint configurations qualified by procedure qualification testing.
Welding electrodes and fluxes shall conform to applicable AWS specifications and shall he selected to match the minimum ultimate strength of the base material, and to provide a minimum of 2() ft-lbs Charpy V-notch (CVN) impact energy at 0°F. Matching CVN toughness may be specified by invoking Supplementary Requirement S4.
If the AWS specification requirement for the electrodes and fluxes to be cmployes is less than the foregoing. or if the welding procedure falls outside the range of essential variables tested in the AWS specification. then Charpy test spedmens shall be removed from a simulated production weld and tested in accordance with Annex III of AWS Dl. I –
The deposited weld metal shall possess an energy value not less than indicated. The foregoing requirements shall apply separately to the final condition of plate welds, pipe welds. and girth welds.
All welding shall conform to the minimum workmanship standards of SectionS of AWS Dl.l.
5.2 WELDING PROCEDURE QUALIFICATiON
The welding procedures shall be established in accordance with AWS Dl .1. Wriflen pre qualified welding procedures may be employed by the fabricator provided the procedure complies with all requirements (joint detail, tiller metal, and so forth) for pre qualified status detailed in Appendix IV of AWS Dl, I. More stringent Charpy V-notch toughness in the weld and/or heat affected zones than required in 5.1.3 above may be obtained, if desired. by specification of Supplementary Requirement (SR2).
The welding procedures shall be established in accordance with AWS DII. Written pee qualified welding procedures may be employed by the fabricator provided the procedure complies with all requirements (joint detail, filler metal. etc.) for pre qualified status detailed in Appendix IV of AWS D.I.I More stringent CVN toughness in the weld and/or heat affected zones ihati required in Par. 3.3. above may be obtained, if desired, by specification of Supplementary Requirement S2.
The foregoing requirements shall apply separately to plate welds, pipe welds and girth welds.
