API 16C 2009 pdf free download
API 16C 2009 pdf free download.Choke and Kill Equipment.
6 Welding 6.1 General Welding requirements are established in four groups as follows: a) non-pressure-containing weldments (except for overlay); b) pressure-containing fabrication weldments—bodies, bonnets, drilling riser choke, kill, and end and outlet connections; c) pressure-containing repair weldments—bodies, bonnets, drilling riser choke, kill, and end and outlet connections; d) weld overlay. 6.2 Non-pressure-containing Weldments 6.2.1 General This section covers non-pressure-containing weldments other than those used in weld overlay, which are covered in 6.5. 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 6.3.3.1 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.
6.3.3.2 Deposited Weld Metal Properties 6.3.3.2.1 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. 6.3.3.2.2 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. 6.3.3.2.3 A cross-weld metal tensile test meets these requirements. 6.3.4 Welding Procedure Qualification 6.3.4.1 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. 6.3.4.2 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. 6.3.4.3 Heat Treat Condition Testing shall be done with the test weldment in the post-weld heat-treated condition. 6.3.4.4 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.
