API SPEC 2B:2001 pdf download.Specification for the Fabrication of Structural Steel Pipe
1 Scope
1.1 This specification covers the fabrication of structural steel pipe formed from plate steel with longitudinal and cir- cumferential butt-welded seams, typically in sizes 14 in. out- side diameter (OD) and larger (40 in. and larger for LWDS) with wall thickness 3 / 8 in. and greater (up to a nominal 40 ft in length) suitable for use in construction of welded offshore structures. The use of the ERW process or spiral welded pipe is not included in this specification. Pipe fabricated under this specification is intended to be used primarily in piling and main structural members, including tubular truss connections, where internal stiffeners are not usually required.
1.2 Manufacturers desiring to apply the API Monogram to the products covered by this specification shall demonstrate to the satisfaction of the American Petroleum Institute a pro- gram of education, training, experience, and/or examination assuring the manufacturer’s personnel are competent in weld- ing, inspection, nondestructive examination, and testing required or referenced by this specification.
5.2 WELDING PROCEDURE QUALIFICATION
The welding procedures shall be established in accor- dance with AWS D1.1. Written pre qualified welding proce- dures may be employed by the fabricator provided the procedure complies with all requirements (joint detail, filler metal, and so forth) for pre qualified status detailed in Appendix IV of AWS D1.1. 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 spec- ification of Supplementary Requirement (SR2). The welding procedures shall be established in accor- dance with AWS D1.1. Written pre qualified welding proce- dures 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.1.1 More stringent CVN toughness in the weld and/or heat affected zones than required in Par. 3.3. above may be obtained, if desired, by specification of Supplemen- tary Requirement S2. The foregoing requirements shall apply separately to plate welds, pipe welds and girth welds.
7.4 REPAIR OF BASE METAL IMPERFECTIONS
Imperfections detected in the base metal shall be explored to determine the extent of each. Imperfections in the finished tube no deeper than 5% of the specified nominal wall thickness and mechanical marks no deeper than 5% of the nominal wall thickness or 1 / 16 in. in depth need not be removed. Imper- fections which exceed the above shall be ground to sound metal. The excavation area shall be faired, and the thickness in the ground area shall not be reduced more than 7% of the nominal thickness but in no case more than 1 / 8 in. depth. If the depth of imperfections in as-rolled plate exceeds the above limits, but not more than 20% of the nominal thick- ness, welding repairs may be performed. Repair of defects deeper than 20% of the nominal wall thickness or repair of defects with a length and/or width more than 20% of the nominal diameter shall not be permitted. Tubulars made from other than as-rolled plate shall not be repaired by welding unless specifically approved by the purchaser.
API SPEC 2B:2001 pdf download
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