CEN TR 14585-3-2017 Corrugated metal hose assemblies for pressure applications - Part 3 Design method.pdf

1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Corrugated metal hose assemblies for pressure applicationsPart 3: Design methodPD CEN/TR 14585-3:2017TECHNICALREPORT RAPPORT TECHNIQUETECHNISCHER BERICHTCEN/TR 14585-3 October 2017ICS 23.040.70EnglishVersionCorrugated m

2、etal hose assemblies for pressure applications - Part 3: Design methodTuyauteries mtalliques flexibles onduleuses pourapplications sous pression - Partie 3: Mthode de conceptionGewellte Metallschlauchleitungen frDruckanwendungen- Teil3:AuslegungsverfahrenThis Technical Report wasapproved by CENon 25

3、 September2017. It has been drawn up by the Technical Committee CEN/TC342.CEN members are the nationalstandards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland,

4、 Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia,Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Cent

5、re: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reservedworldwide for CENnational Members.Ref. No. CEN/TR 14585-3:2017 ENational forewordThis Published Document is the UK implementation of CEN/TR 14585-3:2017.The UK participation in its preparat

6、ion was entrusted to Technical Committee GSE/42, Gas fittings and connections including metal hose and hose assemblies.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a cont

7、ract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 98506 5ICS 23.040.70Compliance with a British Standard cannot confer immunity from legal obligations.This Published Document was published under the a

8、uthority of the Standards Policy and Strategy Committee on 31 December 2017.Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD CEN/TR 14585-3:2017TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN/TR 14585-3 October 2017 ICS 23.040.70 English Version Corruga

9、ted metal hose assemblies for pressure applications - Part 3: Design method Tuyauteries mtalliques flexibles onduleuses pour applications sous pression - Partie 3: Mthode de conception Gewellte Metallschlauchleitungen fr Druckanwendungen - Teil 3: Auslegungsverfahren This Technical Report was approv

10、ed by CEN on 25 September 2017. It has been drawn up by the Technical Committee CEN/TC 342. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary

11、, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN

12、-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TR 14585-3:2017 EPD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 2 Contents Page European foreword . 4 Introduction 5

13、 1 Scope 6 2 Normative references 6 3 Terms and definitions . 6 4 Symbols and abbreviations . 7 5 Materials 10 5.1 General requirements 10 5.2 Suitable materials 10 5.3 Other materials . 13 5.4 Corrosion . 13 5.5 Low temperature application 13 5.6 Material documentation 15 6 Design methods 15 6.1 Ge

14、neral . 15 6.2 Basic design criteria 16 6.2.1 Design conditions . 16 6.2.2 Temperatures 16 6.2.3 Additional loadings . 16 6.2.4 Structural conditions 17 6.2.5 Dimensions . 17 6.3 Design on the basis of nominal pressures PN 19 6.4 Allowable stresses . 19 7 Calculation design method . 20 7.1 General .

15、 20 7.2 Corrugated metal hose . 21 7.2.1 Scope . 21 7.2.2 General factors 22 7.2.3 Limiting conditions 24 7.2.4 Pressure capacity of the corrugated metal hose braided or unbraided 26 7.3 Braid . 28 7.3.1 Scope . 28 7.3.2 General factors 28 7.3.3 Limiting design conditions . 30 7.3.4 Pressure capacit

16、y of the braid . 31 7.4 Metal hose assembly . 31 7.4.1 General . 31 7.4.2 Burst pressure of the corrugated hose . 32 7.4.3 Burst pressure of the braid 33 7.4.4 Burst pressure of the metal hose assembly 33 7.5 Flanges and other end fittings . 34 Annex A (informative) Calculation coefficients Cp, Cf,

17、Cd. 35 A.1 Graphs of coefficients . 35 PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 3 A.2 Polynomial approximation of the coefficients . 38 A.2.1 Coefficients Cp. 38 A.2.2 Coefficients Cf. 39 A.2.3 Coefficients Cd. 39 A.2.4 Intermediate values . 40 Annex B (informative) Main information to be suppl

18、ied to the hose manufacturer. 41 B.1 Main design conditions . 41 B.2 Additional information/requirements dependent on application 41 Bibliography . 42 PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 4 European foreword This document (CEN/TR 14585-3:2017) has been prepared by Technical Committee CEN/TC

19、 342 “Metal hose, hose assemblies, bellows and expansion joints”, the secretariat of which is held by SNV. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent ri

20、ghts. PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 5 Introduction Technical Committee CEN/TC 342 “Metal hose, hose assemblies, bellows and expansion joints” is carrying out a revision of EN 14585-1:2006 and CEN/TR 14585-2:2006 to include calculation methods for the combined structure of hose and br

21、aid for: pressure resistance; fatigue life; allowable displacements. The selection of materials for corrosive environments and the calculation of fluid pressure drops are also being included. It is appreciated that these studies are ambitious and will involve much new analyses so that this revision

22、will take some time. Whilst continuing to work on this revision, CEN/TC 342 decided that the key aspects of the calculation method should be circulated as an informative Technical Report CEN/TR 14585-3, which is limited to the pressure resistance of the combined structure of hose and braid. This app

23、roach will enable manufacturers and Notified Bodies to use and gain experience of the calculation method and any feedback can be taken into account in the revision of EN 14585, harmonized to the Pressure Equipment Directive 2014/68/EU. PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 6 1 Scope This Tec

24、hnical Report provides guidance on the design of corrugated metal hose assemblies for pressure applications, i.e. maximum allowable pressure PS greater than 0,5 bar. Allowable stresses are consistent with the requirements of the Pressure Equipment Directive 2014/68/EU. 2 Normative references Not app

25、licable. 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 7369 and the following apply. 3.1 metal hose assembly assembly of a corrugated metal hose with its end fittings Note 1 to entry: In the context of Pressure Equipment Directive 1, a metal hos

26、e assembly is a component of piping and not a PED assembly. 3.2 maximum allowable pressure PS maximum pressure for which the metal hose assembly is designed 3.3 maximum/minimum allowable temperature TS maximum and minimum temperature for which the metal hose assembly is designed 3.4 nominal pressure

27、 PN dimensionless alphanumerical designation which is a convenient rounded number commonly used for reference purposes of piping components and stock parts; for this Technical Report PN represents the maximum allowable pressure at 20 C as specified by the metal hose assembly manufacturer 3.5 test pr

28、essure PT pressure at which the pressure metal hose assembly is pressure tested (normally at ambient temperature) 3.6 main pressure bearing parts parts, such as corrugated metal hose, braid, pipe ends, the failure of which may result in a sudden discharge of pressure energy 3.7 pressure bearing part

29、s parts, such as swivel nuts, flanges, threaded fittings, that are not main pressure bearing parts defined in 3.6 and the failure of which may not lead to a sudden discharge of pressure energy 3.8 attachments to pressure parts parts, such as ferrules, that are directly welded to parts defined in 3.6

30、 or 3.7 PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 7 3.9 other parts parts, such as external protection, anti-kink device, braid protecting spiral, which are not parts according to 3.6 to 3.8 3.10 equipment manufacturer natural or legal person responsible for the values of the parameters PS and T

31、S Note 1 to entry: This may be the manufacturer or planner of the piping for which the metal hose assembly is designed. 3.11 hose manufacturer natural or legal person responsible for the design and the manufacturing of the corrugated metal hose and/or the metal hose assembly 3.12 hydraulic forming (

32、longitudinal welded) corrugating a tube by pressurizing the inside against external tooling which allows this corrugated tube to be axially shortened during the process 3.13 roll forming (longitudinal welded) corrugating a tube by rolling from the outside to the inside and allowing or forcing this c

33、orrugated tube to be axially shortened during the process 3.14 helical crest welded (resistance welded) profiling a strip, rolling it over helically and finally welding the overlaps 3.15 strand group of parallel wires used for plain braid or wires woven together to form a braided strand 3.16 braided

34、 braid braid that is manufactured from previously braided strands 4 Symbols and abbreviations For the purposes of this document, the symbols listed in Table 1 apply. Table 1 Symbols Symbol Description Unit A elongation at rupture according to EN ISO 68921 % Accross sectional metal area of one corrug

35、ation; see Formula (3a) and 3b) mm2Aehose effective area; see Formula (5) mm2awBraid wire cross section; see Formula (29) mm2bcwidth of corrugation crest; see Figures 2 a) and 2 b) mm PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 8 Symbol Description Unit bnnominal width of material (strip) accordin

36、g to EN ISO 9445-1 mm brwidth of corrugation root; see Figures 2 a) and 2 b) mm bswidth of a strand; see Figure 4 mm C1, C2factors used to determine the calculation coefficients Cp, Cf, Cd; see Formulae (6) and (7) CBbraid coverage; see Formula (38) Cp, Cf, Cdcalculation coefficients (see Annex A) s

37、tc stacking factor for crossing braid wires and strands; see Formula (26) Diinside diameter of the corrugated metal hose; see Figures 2 a) and 2 b) mm Dmmean diameter of the corrugated metal hose; see Formula (8) mm Dooutside diameter of the corrugated metal hose; see Formulae (9a) and (9b) mm dwdia

38、meter of the braid wire; see Figure 4 mm dBmean diameter of a braid layer; see Formula (30) mm E modulus of elasticity of hose material at room temperature N/mm2(MPa) Etmodulus of elasticity of hose material at design temperature N/mm2(MPa) e nominal thickness of hose material; see Figures 2 a) and

39、2 b) mm epnominal thickness of one ply mm e* equivalent wall thickness, corrected for thinning during forming; see Formula (11) mm ep* equivalent thickness of one ply with thinning correction; see Formulae (10a) and (10b) mm Fpforce due to pressure effect (pressure thrust); see Formula (12) N f allo

40、wable general membrane stress at design temperature; see Table 7 N/mm2(MPa)fTallowable general membrane stress at test conditions; see Table 7 N/mm2(MPa) Gdegree of load; see 5.5 and Formula (1) hsthickness of a strand; see Formula (27) mm Kax(1)axial spring rate of one corrugation; see Formula (21)

41、 N/mm Kfforming factor; see Formulae (18) and (19) kreduction factor for circumferential stress due to braid; see Formula (32) kp,tderating factor for the pressure at operating temperature t ; see 6.3 lBaxial pitch of the braid; see Figure 4 and Formula (24) mm lcactive corrugated length of a metal

42、hose mm npnumber of plies of a corrugated metal hose nsnumber of braid strands PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 9 Symbol Description Unit nwnumber of wires in one braid strand P1,0pressure resulting in an initial remaining (plastic) elongation of 1 %; see Formula (22) N/mm2(MPa) Pm,bpri

43、mary meridional bending stress N/mm2(MPa) Pm,mprimary meridional membrane stress N/mm2(MPa) Pprimary circumferential stress N/mm2(MPa) PS amaximum allowable pressure N/mm2(MPa) PT test pressure bar Pt, maxmaximum allowable pressure at operating temperature t; see Formula (2) bar q corrugation length

44、; see Figures 2 a) and 2 b) mm R1to R4bend radii of hose assemblies; see Table 5 mm ReH, t minimum specified value of upper yield strength at design temperature N/mm2(MPa) Rm, tminimum specified value of tensile strength at design temperature N/mm2(MPa) Rm, 20 minimum specified value of tensile stre

45、ngth at room temperature N/mm2(MPa) Rp 0,2, tminimum specified value of 0,2 % proof strength at design temperature N/mm2(MPa) Rp 1,0, t minimum specified value of 1 % proof strength at design temperature N/mm2(MPa) rmmean radius of torus at crest and root of U-shaped corrugations; see Figures 2 a) a

46、nd 2 b) and Formulae (4a) and (4b) mm t operating temperature C tnnominal thickness of the material (strip) mm w corrugation height, see Figures 2 a) and 2 b) and Formula (13) mm initial braid angle; see Figure 4 and Formula (25) degree or radian 0initial side wall angle of the corrugation; see Figu

47、re 3 and Formula (14) degree lel elastic hose elongation due to pressure; see Formula (20) mm lpl plastic hose elongation due to pressure; see Formula (46) mm load carrying efficiency of braid layer; see 7.3.2.4 - relative plastic elongation; see Formula (46) - value of Poissons ratio for stainless

48、steel of 0,3 - (P) stress depending on P N/mm2(MPa) wlongitudinal stress in the braid wire; see Formula (39) N/mm2(MPa) Subscripts: 0 initial B braid H hose o outside p ply pl plastic r root PD CEN/TR 14585-3:2017CEN/TR 14585-3:2017 (E) 10 Symbol Description Unit t test condition b bending or burst

49、condition c corrugation or crest el elastic i inside or running index m membrane, meridional or mean n number of or upper summation index t temperature w wire difference relative elongation circumferential sum aAll pressures for calculation purpose are in N/mm2(MPa).5 Materials 5.1 General requirements Materials for the manufacture of hose assemblies including filler metal should be selected on the basis of their suitability for fabrication, e.g. forming, joining, and for the conditions under which they will be us