API 5LD:2020 pdf free download.Specification for CRA Clad or Lined Steel Pipe
or multiple length seamless pipe, a length shall be consid- ered as all of the sections cut from a particular multiple length. The samples shall be taken as follows: a. Seamless Clad or Lined Pipe. At the option of the manu- facturer, samples used for product analyses of the CRA layer shall be taken either from tensile test specimens or from the finished pipe. b. Welded Clad or Lined Pipe.
At the option of the manufac- turer, samples used for product analyses of the CRA layer shall be taken from either finished pipe, plate, skelp, tensile test specimens, or flattening test specimens. The location of the samples shall be a minimum of 90° from the weld of lon- gitudinally-welded pipe.
The product analyses of the CRA layer may be made by the supplier of the plate or skelp providing the analyses are made in accordance with the frequency requirement stated above. Note: While the corrosion-resistance and other properties of the weld seam and adjacent areas in the welded CRA layer may differ from those of the layer itself, it is the intent of this document that the weld metal shall have corrosion-resistance equal to or exceeding that of the CRA layer. The composition so determined shall conform to the chem- ical requirements shown in Table 1, within the permissible variations for product analyses as shown in Table 3 of Spec 5LC.
5.4 RECHECK ANALYSES If the product analyses of the CRA layer of both lengths of pipe representing the lot fail to conform to the specified requirements, at the manufacturer’s option, either the lot shall stand rejected, or all the remaining lengths in the lot shall be tested individually for conformance to the specified require- ments. If only one of the two samples fails, at the manufac- turer’s option, either the lot shall stand rejected, or two recheck analyses shall be made on two additional lengths from the same lot.
If both recheck analyses conform to the requirements, the lot shall be accepted except for the length represented by the initial analyses which failed. If one or both of the recheck analyses fail, at the manufacturer’s option, the entire lot shall be rejected or each of the remaining lengths shall be tested individually. In the individual testing of the remaining lengths in any lot, analyses for only the rejecting element or elements need be determined. Samples for recheck analyses shall be taken in the same location as speci- fied for product analysis samples.
5.5 CONTROL ANALYSES A product analysis shall be made by the manufacturer, as a control, of each heat used for the production of pipe under this specification. A record of such analyses shall be available to the purchaser.
5.6 CHEMICAL ANALYSES PROCEDURES Methods and practices relating to chemical analysis shall be performed in accordance with ASTM A751, Standard Methods, Practices and Definitions for Chemical Analysis of Steel Products . Calibrations performed shall be traceable to established standards. 5.7 BASE MATERIAL The chemical properties of the base material, including the composition, chemical analysis, recheck analysis and test reports shall conform to Section 3 of Spec 5L.
6 Mechanical Properties and Tests
6.1 MECHANICAL PROPERTIES
All grades of base metal shall conform to the tensile requirements of Sec. 4 of Spec 5L, as applicable. For Grades X42 and higher, other grades intermediate to the listed grades shall conform to the tensile requirements agreed upon between the purchaser and manufacturer, which shall be con- sistent with those specified in Table 4.1, Spec 5L. The yield strength shall be the tensile stress required, for base metal, to produce a total elongation of 0.5% of the gage length, as determined by an extensometer. When elongation is recorded or reported, the record or report shall show the nominal width of base metal of the test specimen when strip specimens are used, or state when full specimens are used. Although compliance with the mechanical properties of this specification is determined by the properties of the base material alone, the mechanical properties of the CRA layer may be specified by agreement between the purchaser and the manufacturer.API 5LD pdf download.API 5LD:2020 pdf free download
