API SPEC 20F-2018 pdf free download

API SPEC 20F-2018 pdf free download.Corrosion-resistant Bolting for Use in the Petroleum and Natural Gas Industries.
1 1.1 Scope Purpose This standard specifies requirements for the qualification, production, and documentation of corrosion-resistant bolting used in the petroleum and natural gas industries. 1.2 Applicability This standard applies when referenced by an applicable API equipment standard or otherwise specified as a requirement for compliance. 1.3 Bolting Specification Levels (BSL) This standard establishes requirements for two bolting specification levels (BSL). These two BSL designations define different levels of technical, quality, and qualification requirements: BSL-2 and BSL-3. The BSLs are numbered in increasing levels of requirements in order to reflect increasing technical, quality, and qualification criteria. BSL-2 and BSL-3 are intended to be comparable to BSL-2 and BSL-3, as found in API 20E. BSL-1 is omitted from this standard. 1.4 Bolting Types for Qualification This standard covers the following product forms, processes, and sizes: a) b) c) d) e) f) g) h) i) 2 machined studs; machined bolts, screws, and nuts; cold-formed bolts, screws, and nuts with cut or cold-formed threads; hot-formed bolts and screws <1 .5 in. (38.1 mm) nominal diameter; hot-formed bolts and screws ≥1 .5 in. (38.1 mm) nominal diameter; roll threaded studs, bolts, and screws <1 .5 in. (38.1 mm) diameter; roll threaded studs, bolts, and screws ≥1 .5 in. (38.1 mm) diameter; hot-formed nuts <1 .5 in. (38.1 mm) nominal diameter; hot-formed nuts ≥1 .5 in. (38.1 mm) nominal diameter. 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 applies (including any addenda/errata). API Specification Q1 , Specification for Quality Management System Requirements for Manufacturing Organizations for the Petroleum and Natural Gas Industry
3 3.1 Terms, Definitions, Acronyms, and Abbreviations Terms and Definitions For the purposes of this document, the following terms and definitions apply. bolting All-thread studs, tap-end studs, double-ended studs, headed bolts, cap screws, screws, and nuts. bolting manufacturer An organization that, through the use of manufacturing equipment and processes appropriate for the bolting product form, transforms raw material into finished bolting. cold-formed bolts, screws, and nuts Parts formed through the mechanical cold upsetting of wire, rod, or bar in order to generate the bolt or screw head (cold heading) or the configuration of the nut. corrosion-resistant bolting Bolting manufactured from metal that achieves improved resistance to corrosion through the addition of alloying elements. heat Material originating from a final melt, or for remelted alloys, the raw material originating from a single remelted ingot. heat lot a) Batch furnace: bolting or raw material of a single heat and diameter, heat treated together as a single solution annealing, quenching, and aging or precipitation hardening charge; b) Continuous furnace (applies to ASTM A453 Grade 660 Class D only): bolting or raw material of a single heat and diameter heat treated without interruption in a continuous charge, as defined in ASTM A453. hot-formed bolts, screws, and nuts Parts formed through the mechanical hot upsetting of wire, rod, or bar in order to generate the bolt or screw head (hot heading) or the configuration of the nut. machined bolts, screws, and nuts Parts manufactured by machining from raw material to generate the bolt, screw head, or the configuration of the nut. manufacturing process specification MPS A written document describing the complete production sequence and method. NOTE MPSs are usually proprietary by manufacturer and not for general publication, but are available to customers or authorized third parties for information.
4.3 4.3.1 Materials and Dimensions The following bolting materials are covered by this standard: — precipitation hardened nickel-based alloys in accordance with API 6ACRA; — precipitation hardened austenitic iron-based ASTM A453 Grade 660 Class D; — cold-reduced only, or cold-reduced and high-temperature aged heat treated condition cobalt-based alloy UNS R30035. 4.3.2 All requirements of API 6ACRA, ASTM A453, or UNS R30035 shall be met, except as modified by this standard. In the case of conflict between the requirements of referenced specifications and this standard, the requirements of this standard shall apply. 4.3.3 For UNS R30035, the bolting manufacturer shall have a written specification that complies with the SAE AMS 5844 chemistry, melting practice, solution annealing, furnace tolerances, and average grain size, with additional requirements shown below. 4.2.1.1 For UNS R30035 with a maximum hardness of 35 HRC, raw material shall be supplied in the solution annealed and cold-reduced condition and not subsequently aged.