API SPEC 5D:2001 pdf download.Specification for Drill Pipe
3 Definitions
For the purposes of this speciÞcation, the following deÞni- tions apply: 3.1 carload: The quantity of pipe loaded on a rail car for shipment from the pipe-making facilities. 3.2 defect: An imperfection of sufÞcient magnitude to warrant rejection of the product based on the stipulations of this speciÞcation. 3.3 elephant hide: The wrinkled outside diameter sur- faces of the pipe caused by the upsetting of end areas exposed to forging temperatures. 3.4 heat: The metal produced by a single cycle of a batch melting process. 3.5 heat analysis: The chemical analysis representative of a heat as reported by the metal producer. 3.6 imperfection: A discontinuity or irregularity in the product detected by methods outlined in this speciÞcation.3.8 inspection lot: A deÞnite quantity of product manu- factured under conditions that are considered uniform for the attribute to be inspected. 3.9 inspection lot sample: One or more units of product selected from an inspection lot to represent that inspection lot. 3.10 inspection lot size: The number of units in an inspection lot. 3.11 linear imperfections: Include, but are not limited to, cracks, seams, laps, plug scores, cuts, gouges, and ele- phant hide. 3.12 manufacturer: The term manufacturer as used throughout this speciÞcation refers to the Þrm, company, or corporation responsible for marking the product to warrant that the product conforms to the speciÞcation. The manufac- turer may be either a pipe mill or processor. The manufacturer is responsible for compliance with all of the applicable provi- sions of the speciÞcation. 3.13 may: Used to indicate that a provision is optional. 3.14 nonlinear imperfections: Include, but are not lim- ited to, pits and round bottom die-stamping. 3.15 outside diameter exposed surfaces: 1) For EUE and IEUE, the areas are the upset ( L eu ), taper ( m eu ), and adja- cent pipe body. 2) For IUE, the area over the upset ( L iu ), the area over the internal taper ( m iu ), and the adjacent pipe body. 3.16 pipe mill: A Þrm, company, or corporation that oper- ates pipe-making facilities.
If all of the retest specimens conform to the requirements, all the lengths in the lot shall be accepted except the length from which the initial specimen was taken. If more than one of the original test specimens fails or one or more of the retest specimens fail to conform to the speciÞed requirements, the manufacturer may elect to individually test the remaining lengths in the lot, in which case determinations are necessary only for the particular requirements with which the specimens failed to comply in the preceding tests. Specimens for retests shall be taken in the same manner as speciÞed in 7.1.3. Mate- rial from the same heat of steel which has been rejected by one or more of the above criteria may be reheat treated and retested, as by deÞnition it is then a new lot of pipe.