1、BSI Standards PublicationBS ISO 18418-2:2014Gasoline engines Mediumpressure liquid fuel supplyconnectionsPart 2: Pipe assembliesBS ISO 18418-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18418-2:2014.The UK participation in its preparation was entruste
2、d to TechnicalCommittee MCE/22, Engines for road vehicles.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The Bri
3、tish Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 81008 4ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 Novemb
4、er 2014.Amendments issued since publicationDate Text affectedBS ISO 18418-2:2014 ISO 2014Gasoline engines Medium pressure liquid fuel supply connections Part 2: Pipe assembliesMoteurs essence Connections pour des lignes de combustible liquide moyenne pression Partie 2: Lignes assemblesINTERNATIONAL
5、STANDARDISO18418-2First edition2014-11-15Reference numberISO 18418-2:2014(E)BS ISO 18418-2:2014ISO 18418-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise i
6、n any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase pos
7、tale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 18418-2:2014ISO 18418-2:2014(E)Contents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Dimensions and tolerances . 14 Cleanliness 35 Minimum ben
8、d radii . 36 Pipe end connections . 36.1 General . 36.2 Type of connection ends . 36.3 Pipe end assembly for 60 female cones. 47 Operating pressure 58 Ovality of bending portion . 59 Tightening torque and sealing performance 510 Designation 611 Packaging and identification . 6Bibliography 7 ISO 2014
9、 All rights reserved iiiBS ISO 18418-2:2014ISO 18418-2:2014(E)ForewordISO (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 out through ISO technical commi
10、ttees. 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 collaborates closely with the I
11、nternational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
12、different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO
13、 shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this docum
14、ent is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade
15、(TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 7, Injection equipment and filters for use on road vehicles.ISO 18418 consists of the following parts, under the general title Gasoline engines Me
16、dium pressure liquid fuel supply connections: Part 1: 60 female cone connectors Part 2: Pipe assembliesiv ISO 2014 All rights reservedBS ISO 18418-2:2014ISO 18418-2:2014(E)IntroductionSome spark ignition (SI) engines use direct injection (DI) fuel systems which supply gasoline under pressure to a ra
17、il and to the injectors via pipe assemblies with a 60 female cone connector. Such components are similar to ISO 2974 and ISO 13296 for the diesel injection systems except for the relationship between the outside and inside diameters of the pipes due to the lower pressure range. ISO 2014 All rights r
18、eserved vBS ISO 18418-2:2014BS ISO 18418-2:2014Gasoline engines Medium pressure liquid fuel supply connections Part 2: Pipe assemblies1 ScopeThis part of ISO 18418 specifies dimensions and requirements for medium-pressure fuel pipe assemblies and assembled pipe sets made of seamless stainless steel
19、tubing to be used with 60 female cone connectors on gasoline (spark-ignition) engines.NOTE 1 Dimensions of 60 female cone connectors are specified in ISO 18418-1.NOTE 2 Material properties of stainless steel tubing are specified in ISO 9329-4. The chemical composition of stainless steels can be foun
20、d in ISO 15510.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inclu
21、ding any amendments) applies.ISO 9329-4:1997, Seamless steel tubes for pressure purposes Technical delivery conditions Part 4: Austenitic stainless steelsISO 12345, Diesel engines Cleanliness assessment of fuel injection equipmentISO 15510:2014, Stainless steels Chemical compositionISO 18418-1:2014,
22、 Gasoline engines Medium pressure liquid fuel supply connections Part 1: 60 female cone connectors3 Dimensions and tolerancesThe requirement and configuration drawing for a pipe assembly shall include at least the following:a) indication of compliance with this part of ISO 18418;b) the thread and th
23、e hexagon size of the connector nuts according to Tables 1 and 2;c) the type of the connection ends as specified in 6.2;d) a graphic representation of the centreline of the pipe with the connection ends and each bend intersection labelled as a point, with each point listed in a table with Cartesian
24、coordinates x, y, and z with the orthogonal distance from the axis and the bend radius (the beginning and end points are given as the “S” dimension for the defined configuration);NOTE The coordinates are used to specify the theoretical exact centreline of the pipe. See the example given in Figure 1.
25、e) the developed length of the pipe as an approximated value;f) the material and surface finish requirements of the pipe and connector nuts.INTERNATIONAL STANDARD ISO 18418-2:2014(E) ISO 2014 All rights reserved 1BS ISO 18418-2:2014ISO 18418-2:2014(E)The dimensional tolerance of a pipe assembly shal
26、l be stated in terms of the actual outside contour of the tube in relation to the specified maximum outside contour and the variance of the actual pipe connection end from specified position, as agreed between supplier and customer.Dimensions in millimetresPoint x y z Radius A 0 0 0 0 B 65 0 0 20 C
27、65 100 0 20 D 140 100 0 20 E 140 170 0 20 F 40 170 0 20 G 40 235 0 0 Key1 connector nut: thread M14; hexagon across flats 172 pipe: tube outside diameter 8 mm3 pipe connection endsaDeveloped length.NOTE For dimension S see, Table 1.Figure 1 Example of a requirement and configuration drawing2 ISO 201
28、4 All rights reservedBS ISO 18418-2:2014ISO 18418-2:2014(E)4 CleanlinessThe bore of a pipe assembly shall be clean, and this shall be assessed in accordance with ISO 12345. Unless otherwise agreed between supplier and customer, cleanliness of pipe assemblies shall be designated using the Fuel Inject
29、ion Equipment Cleanliness Code (FIECC), as defined in ISO 12345.5 Minimum bend radiiThe radius of any bend made in fabricating pipe assemblies shall be not less than two and one-eighth times (2,125) the outside diameter of the pipe as measured from the pipe centreline. Bends shall be a sufficient di
30、stance from the end-connections so as to allow easy fitting of the pipe assembly for its intended use. Bends shall be a sufficient distance from one another so as not to impair fabrication. Bend radii shall be of uniform size in each pipe assembly whenever possible.6 Pipe end connections6.1 GeneralT
31、he relationships of connection ends to the connector nut and with the dimensions G and S are shown in Table 1 for the 60 female cone.The design of the shoulders of the connection end and of the related connector nut shall be agreed between supplier and customer.NOTE The dimensional characteristics o
32、f 60 female cones are described in ISO 18418-1.6.2 Type of connection endsIn Figure 2, the design of connection ends with a spherical sealing face for pipe assemblies is shown.Key1 connection end sealing face (spherical)2 shoulder of connection end3 connection end of pipeaSpherical shape of the conn
33、ection end sealing face and of the shoulder in order to allow an inclined position of the pipe connection end to the matching female cone.bSpherical connection end to fit into the 60 female cone specified in ISO 18418-1.NOTE For dimensions G and S, see Table 1.Figure 2 Connection end ISO 2014 All ri
34、ghts reserved 3BS ISO 18418-2:2014ISO 18418-2:2014(E)6.3 Pipe end assembly for 60 female conesFigure 3 shows the basic requirements and relationships of a connection end assembled to the related connector nut.For dimensions, see Table 1.NOTE The dimensions of Table 1 correspond to the values specifi
35、ed in ISO 18418-1:2014, Table 1.Key1 connection end sealing face (spherical)2 chamfer to root of thread3 connection end of pipe (according to Figure 2)4 connector nut (according to Table 2)aWhen defining dimension L, there shall be clearance between the base of the connector nut and the surface of t
36、he mating component (defined in ISO 18418-1) to ensure correct sealing force, taking into account material deformation after tightening while maintaining a minimum thread engagement of 3x pitch.Figure 3 Pipe end assembly for 60 female cones (schematically)Table 1 Dimensions of pipe end connections f
37、or 60 female conesDimensions in millimetresTube out-side diam-eterThreadaAReference diameter SbP 0,5Gb0,4L max.Tube inside diameter8 M14 1,57,5 10,5 to 12 0,8 10 5,05,66,08,2 or 8,5 10,5 to 12 0,8 109,4 10,5 to 12 1,4 1010 M16 1,58,5 12 to 13,5 0,8 107,09,4 12 to 13,5 1,4 10aTolerance classes of thr
38、eads: 6H for connector nuts.bThe intersection of S and G represents a typical contact line with the female cone.The preferred hexagon size for the connector nuts are listed in Table 2.4 ISO 2014 All rights reservedBS ISO 18418-2:2014ISO 18418-2:2014(E)Table 2 Connector nut wrench size for 60 female
39、conesDimensions in millimetresTube outside diameter Wrench size8 M14 1,5 17aor 1910 M16 1,5 24aPreferred.7 Operating pressureThe permissible operating pressure shall be specified with an adequate safety margin below the fatigue strength under pulsating internal pressure, and shall be agreed upon bet
40、ween supplier and customer.8 Ovality of bending portionThe ovality of any bending portion made in fabricating pipe assemblies shall be not more than 15 % . The ovality of bending portion is affected by material physical properties, inside/outside diameter ratio, bend radius, and type of fabrication.
41、100)(2+=SLSLDDDDLSKey percent ovalityDLmajor axisDSminor axisFigure 4 Definition of ovality9 Tightening torque and sealing performanceThe tightening torque to connect the connection ends of the pipe assemblies with a pump and a rail shall be determined carefully so that no fuel leakage from the seal
42、ing faces, rotational movement of the mating components, or unfavourable deformation of the sealing faces, threads, or pipe connection ends will occur.The adequate tightening torque for the connection ends will vary according to the combination of size and material of the tube, size and material of
43、connector nut, design of the shoulder of the connection end and the connector nut, etc. The design should reflect the thread engagement requirements specified in ISO 18418-1:2014, Figure 1. The required tightening torque shall be determined empirically between the supplier and the customer.The seali
44、ng performance shall be tested by fitting the pipe assembly to 60 female cone connectors and by applying the lower limit of the determined tightening torque. For the test, the same type of fuel as for actual operation and the maximum fuel pressure encountered in actual operation shall be used. ISO 2
45、014 All rights reserved 5BS ISO 18418-2:2014ISO 18418-2:2014(E)10 DesignationThe stainless steel tube used for assemblies described herein shall be designated as follows, in the order given: the denomination “Tube”; a reference to this part of ISO 18418, i.e. ISO 18418-2; dimensions (outside diamete
46、r wall thickness), in millimetres (mm) (see Table 1); a reference to ISO 9329-4; steel designation (according to ISO 9329-4:1997, Table 1 or ISO 15510:2014, Table 1); symbol for the type of condition (according to ISO 9329-4:1997, Table 7);EXAMPLE A tube with an outside diameter of 8 mm, a wall thic
47、kness of 1,5 mm, made of steel designation X5 CrNi 18 10, and in type condition CFS4:Tube ISO 18418-2 - 8 1,5 - ISO 9329-4 - X5 CrNi 18 10 - CFS411 Packaging and identificationPipe assemblies and assembled pipe sets shall be identified as agreed upon between supplier and customer. The products shall
48、 be packaged in such a manner as to prevent the ingress of debris during transit or storage and to protect the mating surfaces from damage.6 ISO 2014 All rights reservedBS ISO 18418-2:2014ISO 18418-2:2014(E)Bibliography1 ISO 2974, Diesel engines 60 degree female cones for high-pressure fuel injectio
49、n components2 ISO 13296, Diesel engines High-pressure fuel injection pipe assemblies General requirements and dimensions ISO 2014 All rights reserved 7BS ISO 18418-2:2014ISO 18418-2:2014(E) ISO 2014 All rights reservedICS 43.060.40Price based on 7 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter.
