API RP 6DR-2006 pdf download.Repair and Remanufacture of Pipeline Valves.
6 Disassembly and Cleaning of Valves Valves to be reconditioned shall be completely disassembled. Packing, gaskets, and non-metallic parts shall be removed and dis- posed of in accordance with the owner’s instructions and appropriate safety procedures. The Original Equipment Manufacturer (OEM) tag shall not be removed. Damaged tags which cannot be properly attached shall be retained in the reconditioned valve document file. Tags from previous reconditioning shall be removed and the tag(s) or infor- mation from the tag(s) placed in the reconditioned valve document file. Tags may be electronically scanned or the information recorded and kept in the reconditioning document files. The new identifier number shall be stamped on body, bonnet, cover, closure member, seats (if removed), stem and any other major components, using low stress stencils. If stamping is not practical, parts may be tagged or electro etched, except that all stems and closure elements for valves 2 in. and larger valves shall be marked by stamping. Identification numbers marked on parts shall remain on the parts throughout the reconditioning process. Smaller parts may be placed in a container labeled with the unique identification number. Marking/labeling shall be of a type and material that resists damage, fading, or loss for a period of time consistent with the expected storage period. Valve parts shall be cleaned using any of the usual cleaning methods. These include but are not limited to steam, chemical, sand/ bead, or shot blasting. Finished surfaces that may be damaged shall be protected.
7 Evaluation of components All components shall be inspected and evaluated in accordance with documented procedures. This shall consist of the following, as a minimum: • Visual and dimensional inspection as to suitability for reuse. • Verification of API Spec 6D specified flange and end-to-end dimensions. • Evaluation as to valve fitness and function. Appendix A provides minimum requirements for evaluation of components. 8 Repair/Remanufacture/Replacement of Valve Parts 8.1 CONTROL OF MANUFACTURING OPERATIONS Repair and remanufacture operations shall be performed in accordance with documented procedures. 8.2 INSPECTION OF VALVE PARTS Valve parts shall be inspected to determine their acceptability for re-use and/or extent of required repair. Inspection shall be per- formed per documented procedures not less stringent than the OEM or owner’s requirements. Equipment for measuring dimensions shall be controlled and calibrated in accordance with the reconditioner’s methods specified in documented procedures which shall be consistent with nationally or internationally recognized standards. 8.3 REPLACEMENT PARTS AND MATERIAL Source of replacement parts shall be one or more of the following: a. Suitable replacement parts from the OEM. b. Parts obtained from similar valves from the same valve manufacturer. The material must be identified, and critical dimensions verified to be the same as the original component. c. Manufactured or repaired component parts, from the recondition facility. These parts shall be made from materials equivalent to the original. Where the material cannot be determined or it is desirable to substitute a material different from the original, the part design shall be supported by the OEM’s design file or the reconditioner’s design file which is not less stringent than the OEM design file.
8.4 FABRICATION WELDING Weld procedures used for pressure or load bearing fabrication welds in pressure containing and/or pressure-controlling parts shall be qualified in accordance with ASME Section IX or EN 288-3. Welders shall be qualified per ASME Section IX or EN 287-1. Weld procedures used for pressure or load bearing welds in pressure containing and/or pressure-controlling parts for low temper- ature materials shall also be qualified in accordance with the applicable sections of the current edition of API Spec 6D/ISO 14313 relating to Impact Testing of welds. Procedures for non-pressure retaining or non-load bearing welds shall be qualified per the reconditioner’s requirements. Weld Procedure Specifications (WPS) shall be documented, qualified, and a copy of the Procedure Qualification Record (PQR) retained. All weld procedures used for wetted components in valves intended for use in sour oil or gas shall also meet the requirements of NACE MR0175/ISO 15156. 8.5 REPAIR WELDING Repair welding is limited to repairing local defects or indications. Repair welding is not allowed for major fabrication welding.