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API 591 2019 pdf free download

API 591 2019 pdf free download.Process Valve Qualification Procedure.
1 Scope This recommended practice (RP) provides recommendations for evaluation of a manufacturer’s valve construction and quality management system for the purpose of determining a manufacturer’s capability to provide new valves manufactured in accordance with the applicable standards listed in Section 2. Testing per this RP that does not have an established requirement in the applicable standard is for information only. Qualification of valves under this RP is “manufacturing facility specific” and does not cover valves manufactured by other manufacturing facilities, whether owned by the same manufacturer or a third party. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies, except that new editions may be used on issue and shall become mandatory upon the effective date specified by the publisher or 12 months from the date of the revision (where no effective date is specified). API RP 578, Material Verification Program for New and Existing Alloy Piping Systems API 594, Check Valves: Flanged, Lug, Wafer, and Butt-welding API 598, Valve Inspection and Testing API 599, Metal Plug Valves—Flanged, Threaded and Welding Ends API 600, Bolted Bonnet Steel Gate Valves for Petroleum and Natural Gas Industries API 602, Steel Gate, Globe and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas Industries API 603, Corrosion-resistant, Bolted Bonnet Gate Valves—Flanged and Welding End API 607, Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats API 608, Metal Ball Valves—Flanged, Threaded, and Butt-welding Ends API 609, Butterfly Valves: Double Flanged, Lug- and Wafer-type API 623, Steel Globe Valves-Flanged and Butt-welding Ends, Bolted Bonnets 3 Terms and Definitions For the purpose of this document the following terms and definitions apply. 3.1 acceptance criteria Specified limits placed on the characteristics of an item, process, or service defined in codes, standards, or other manufacturer provided documents. 3.2 audit A planned and documented activity performed to determine by investigation, examination, or evaluation of objective evidence the adequacy of and compliance with established procedures, instructions, drawings, and other applicable documents and the effectiveness of implementation. 3.3 break-to-open torque The torque required to break (unseat) the valve closure element from its fully closed (seated) position, against the rated pressure differential. 3.4 casting method For purposes of this document, casting method shall refer to either sand or investment casting method. 3.5 characteristic Any property or attribute of an item, process, or service that is distinct, describable, and measurable.
3.6 end-to-close torque The torque required to close (seat) the valve closure element to its fully closed (seated) position, against the rated pressure differential. 3.7 manufacturer The entity whose name or trademark appears on a valve. 3.8 manufacturing facility Location of final assembly, inspection, and testing of the valve selected for evaluation. 3.9 nonconformance Any item or action that does not meet the requirements of the standards listed in Section 2 or the manufacturer’s specifications. 3.10 pressure-containing components Any shell component (bodies, bonnets, covers, caps, or end pieces). 3.11 purchaser A person, group, company, agency, corporation, or designated representative responsible for valve acceptance. 3.12 qualification facility A testing facility that has no commercial relationship with the valve manufacturer, including ownership/part ownership or any other business relationship beyond testing to this RP or being an authorized modification facility for such manufacturer. 3.13 quality management system (QMS) The planned and systematic actions necessary to provide confidence that a valve is manufactured in accordance with the requirements of the referenced API standard and manufacturer’s specifications. 3.14 stem cylindricity A condition of a surface of revolution in which all points of the surface are equidistant from a common axis. 3.15 stem run-out The difference in diameters of a stem measured at intervals along its length when the stem is rotated 360º. 3.16 stem straightness The condition in which the longitudinal elements of a stem or shaft are compared to a straight line.

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