1、Special Purpose Couplings forPetroleum, Chemical and GasIndustry ServicesAPI STANDARD 671FOURTH EDITION, AUGUST 2007REAFFIRMED, SEPTEMBER 2010ISO 10441:2007 (Identical), Petroleum, petrochemicaland natural gas industriesFlexible couplings formechanical power transmissionSpecial-purposeapplicationsSp
2、ecial Notes API publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed. Neither API nor any of APIs employees, subcontractors, consultants, committees, or other assignees make any warr
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14、ent, telephone (202) 682-8000. A catalog of API publications and materials is published annually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005. Suggested revisions are invited and should be submitted to the Standards and Publications Department, API, 1220 L Street, NW, Wa
15、shington, DC 20005, standardsapi.org. iiiContents Page API Foreword ii Foreword .v Introductionvi 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Statutory requirements.7 5 Coupling selection 7 6 Coupling design 9 7 Coupling ratings11 8 Coupling requirements .12 8.1 Metallic flexible-e
16、lement couplings.12 8.2 Machining.12 8.3 Spacer.13 8.4 Hub type .13 8.5 Integral flanges13 8.6 Hubs13 8.7 Solo plate (idling adapter) 15 8.8 Moment simulator15 8.9 Component fit tolerances and potential unbalance calculations.15 8.10 Fasteners (including studs) .15 8.11 Electrical insulation.16 8.12
17、 Dynamics16 9 Balance.17 9.1 General .17 9.2 Balancing methods .18 9.3 Balance criteria20 9.4 Trim balance holes23 10 Materials .24 11 Accessories .24 12 Manufacturing quality, inspection, testing and preparation for shipment25 12.1 Manufacturing quality .25 12.2 Inspection and testing 25 12.3 Inspe
18、ction.26 12.4 Testing26 12.5 Preparation for shipment27 13 Vendor data27 13.1 General .27 13.2 Proposals and contract data 28 Annex A (normative) Torsional damping couplings and resilient couplings.31 Annex B (normative) Gear couplings .34 iv Annex C (normative) Quill-shaft couplings . 36 Annex D (i
19、nformative) Factors for metallic element couplings . 37 Annex E (informative) Example of the determination of potential unbalance . 39 Annex F (informative) Examples of misalignments 43 Annex G (informative) Coupling tapers 44 Annex H (normative) Coupling guards 45 Annex I (informative) Procedure fo
20、r residual unbalance check 47 Annex J (informative) Coupling datasheets 51 Bibliography. 56 vForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried
21、 out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
22、 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Internation
23、al Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elem
24、ents of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10441 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, S
25、ubcommittee SC 6, Processing equipment and systems. This second edition cancels and replaces the first edition (ISO 10441:1999), which has been technically revised. vi Introduction This International Standard was developed from the API Std 671, 3rd edition, 1998. It is intended that the 4th edition
26、of API Std 671 will be identical to this International Standard. Users of this International Standard should be aware that further or differing requirements may be needed for individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser from
27、 accepting alternative equipment or engineering solutions for the individual application. This may be particularly appropriate where there is innovative or developing technology. Where an alternative is offered, the vendor should identify any variations from this International Standard and provide d
28、etails. This International Standard requires the purchaser to specify certain details and features. A bullet () at the beginning of a subclause or paragraph indicates that either a decision is required or further information is to be provided by the purchaser. This information should be indicated on
29、 the datasheet(s), typical examples of which are included as Annex J; otherwise it should be stated in the quotation request or in the order. 1Petroleum, petrochemical and natural gas industries Flexible couplings for mechanical power transmission Special-purpose applications 1 Scope This Internatio
30、nal Standard specifies the requirements for couplings for the transmission of power between the rotating shafts of two machines in special-purpose applications in the petroleum, petrochemical and natural gas industries. Such applications are typically in large and/or high speed machines, in services
31、 that can be required to operate continuously for extended periods, are often unspared and are critical to the continued operation of the installation. By agreement, it can be used for other applications or services. Couplings covered by this International Standard are designed to accommodate parall
32、el (or lateral) offset, angular misalignment and axial displacement of the shafts without imposing unacceptable mechanical loading on the coupled machines. It is applicable to gear, metallic flexible element, quill shaft and torsionally resilient type couplings. Torsional damping and resilient type
33、couplings are detailed in Annex A; gear-type couplings are detailed in Annex B and quill shaft style couplings are detailed in Annex C. This International Standard covers the design, materials of construction, manufacturing quality, inspection and testing of special-purpose couplings. This Internati
34、onal Standard does not define criteria for the selection of coupling types for specific applications. This International Standard is not applicable to other types of couplings, such as clutch, hydraulic, eddy-current, rigid, radial spline, chain and bellows types. 2 Normative references The followin
35、g 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. ISO 262, ISO general-purpose metric screw threads Selected si
36、zes for screws, bolts and nuts ISO 286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts ISO 2491, Thin parallel keys and their corresponding keyways (Dimensions in millimetres) ANSI Y14.2M1), Line Conventions and Lettering ANSI/AG
37、MA 90002), Flexible Couplings Potential Unbalance Classification ANSI/AGMA 9002, Bores and Keyways for Flexible Couplings (Inch Series) ANSI/AGMA 9003, Flexible Couplings Keyless Fits 1) American National Standards Institute, 25 West 43rd Street, 4th Floor, New York, NY 10036, USA.2) American Gear M
38、anufacturers Association, 500 Montgomery Street, Suite 350, Alexandria, VA 22314-1560, USA. API Standard 671/ISO 10441 2 ANSI/AGMA 9004, Flexible Couplings Mass Elastic Properties and other Characteristics (Inch Series) ANSI/AGMA 9104, Flexible Couplings Mass Elastic Properties and other Characteris
39、tics (Metric Series) ANSI/AGMA 9112, Bores and Keyways for Flexible Couplings (Metric Series) ANSI/ASME B1.13), Unified inch screw threads, UN and UNR thread form DIN 71904), Interference fits Calculation and design rules 3 Terms and definitions For the purposes of this document, the following terms
40、 and definitions apply. 3.1 angular misalignment double-engagement couplings two minor angles between the extension of each machine centreline and the centreline of the structure joining the two flexible elements 3.2 angular misalignment single-engagement couplings minor angle between the extensions
41、 of two machine-shaft centrelines NOTE If the shaft centrelines do not intersect, a single-engagement coupling is not appropriate. 3.3 assembly balance procedure in which a completely assembled coupling is balanced as a unit 3.4 assembly balance check procedure in which an assembled coupling is plac
42、ed on a balancing machine and the residual unbalance is measured NOTE An assembly balance check can be carried out on a component balanced coupling, or on an assembly-balanced coupling. 3.5 axial displacement change in the relative axial position of the adjacent shaft ends of two coupled machines, u
43、sually caused by thermal expansion 3.6 component balance procedure for achieving coupling balance in which the components or factory assembled sub-assemblies are balanced separately before assembly of the coupling 3.7 continuous torque rating coupling manufacturers declared maximum torque that the c
44、oupling is capable of transmitting continuously for unlimited periods 3) ASME International, Three Park Avenue, New York, NY 10016-5990, USA. 4) Deutsches Institut fur Normung, Burggrafenstrasse 6, Sresemannallee 15, Berlin, Germany D-10787. API Standard 671/ISO 10441 33.8 crown diameter major diame
45、ter of the external teeth of a gear-type coupling 3.9 distance between shaft ends DBSE distance from the extreme end of one shaft (including any threaded end) to the extreme end of the next shaft or, in the case of integral flanges, the distance from the mating faces 3.10 double engagement coupling
46、coupling with two planes of flexure NOTE This arrangement enables couplings of certain types, notably gear and metallic flexible element types, that cannot normally accommodate parallel (or lateral) offset, to do so. 3.11 factor of safety factor that is used to cover uncertainties in a coupling desi
47、gn EXAMPLES Analytical assumptions in stress analysis, material properties, manufacturing tolerances, etc. NOTE Under given design conditions, the factor of safety is the material yield strength divided by the calculated stress, where the stress is a function of torque, speed, misalignment and axial
48、 displacement. 3.12 fatigue factor of safety factor of safety at the published continuous rated conditions of torque, speed, misalignment and axial displacement, used by the manufacturer to establish the coupling rating See 7.1. NOTE The fatigue factor of safety is further explained and defined in A
49、nnex D. 3.13 flex-hub coupling gear-type coupling with the external teeth on the hubs and the internal teeth in the sleeves 3.14 gear coupling coupling of the mechanical contact type that transmits torque and accommodates angular misalignment, parallel offset and axial displacement by relative rocking and sliding motion between mating, profiled gear teeth 3.15 half coupling composite of all of the components of the coupling attached to, and supported from, one shaft including an appropriate portion of the spacer assembly in the case of a double-engagement couplin
