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API 16C 2009 pdf free download

API 16C 2009 pdf free download.Choke and Kill Equipment.
6.2.2 Welding Procedure/Performance Welding procedures and performance qualifications shall be in accordance with ASME BPVC, Section IX, Article II and Article III. 6.2.3 Application Welding shall be performed in accordance with qualified procedures by qualified welding personnel. Weld joint types and sizes shall meet the manufacturer’s written design requirements. 6.2.4 Quality Control Requirements Welding and completed welds shall meet the requirements of Section 7. 6.3 Pressure-containing Fabrication Weldments 6.3.1 General Pressure-containing fabrication weldments for bodies, bonnets, drilling riser choke and kill lines, and end and outlet connections are covered in this section. 6.3.2 Joint Design Design of groove and fillet welds with tolerances shall be documented in the manufacturer’s specifications. Annex C provides information on weld groove designs. 6.3.3 Materials Welding Consumables Welding consumables shall conform to AWS A.5.1 or the manufacturer’s written specifications. The manufacturer shall have a written procedure for storage and control of welding consumables. Materials of low hydrogen type shall be stored and used as specified by consumable manufacturer to retain their original low hydrogen properties. Deposited Weld Metal Properties The deposited weld metal’s mechanical properties shall meet or exceed the minimum specified mechanical properties of the base material. Verification of properties shall be established through the implementation of the manufacturer’s WPS and supporting PQR. When materials of differing strength are joined, the weld metal shall meet the minimum requirements of the lesser material. For applications involving multiple PWHT, the mechanical properties of the deposited weld metal after all PWHT is complete shall meet or exceed the minimum specified mechanical properties for the base material as documented on the applicable PQR. A cross-weld metal tensile test meets these requirements. 6.3.4 Welding Procedure Qualification Written Procedure Welding shall be performed in accordance with welding procedure specifications (WPS) written and qualified in accordance with ASME BPVC, Section IX, Article II. The WPS shall describe the essential, non-essential, and supplementary essential (when required—see ASME BPVC, Section IX) variables. The PQR shall record essential and supplementary essential (when required) variables of the weld procedure used for the qualification test(s). Both the WPS and PQR shall be maintained as records in accordance with the requirements in 7.6. Base Metal Groupings A WPS for each material which is not listed in an ASME BPVC, Section IX, P-number grouping shall be specifically qualified for the manufacturer’s specified base material. Heat Treat Condition Testing shall be done with the test weldment in the post-weld heat-treated condition. Heat Treatment The post-weld heat treatment of the test weldment shall be in the same temperature range as that specified on the WPS. Allowable range for the post-weld heat treatment on the WPS shall be a nominal temperature range ±25 °F (±13.9 °C). See Annex D for the qualification of heat treating equipment. 6.3.5 Post-weld Heat Treatment, Local Heating General Local post-weld heat treatment shall consist of heating a circumferential band around the weld at a temperature within the ranges specified in the qualified welding procedure specification. The minimum width of the controlled band at each side of the weld on the face of the greatest weld width shall be the thickness of the weld, or 2 in. (5.1 cm) from the weld edge, whichever is less. Heating by direct flame impingement on the material shall not be permitted. Impact Testing One set of three test specimens each shall be removed at the 1 / 4 thickness location of the test weldment for each of the weld metal and base material heat affected zone (HAZ). The root of the notch shall be oriented normal to the surface of the test weldment and located as follows. a) Weld metal specimens (three each); 100 % weld metal.

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