CEN/TR 14585-3:2017

SLOVENSKI STANDARD
01-februar-2018
9DORYLWLNRYLQVNLFHYQLVHVWDYLYWODþQLKFHYRYRGLKGHO0HWRGHQDþUWRYDQMD
Corrugated metal hose assemblies for pressure applications - Part 3: Design methods
Gewellte Metallschlauchleitungen für Druckanwendungen - Teil 3: Auslegungsverfahren
Tuyauteries métalliques flexibles onduleuses pour applications sous pression - Partie 3:
Méthode de conception
Ta slovenski standard je istoveten z: CEN/TR 14585-3:2017
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TR 14585-3
TECHNICAL REPORT
RAPPORT TECHNIQUE
October 2017
TECHNISCHER BERICHT
ICS 23.040.70
English Version
Corrugated metal hose assemblies for pressure
applications - Part 3: Design method
Tuyauteries métalliques flexibles onduleuses pour Gewellte Metallschlauchleitungen für
applications sous pression - Partie 3: Méthode de Druckanwendungen - Teil 3: Auslegungsverfahren
conception
This Technical Report was approved 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, 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
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 14585-3:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
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 General . 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 . 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 capacity 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 C , C , C . 35
p f d
A.1 Graphs of coefficients . 35
A.2 Polynomial approximation of the coefficients . 38
A.2.1 Coefficients C . 38
p
A.2.2 Coefficients C . 39
f
A.2.3 Coefficients C . 39
d
A.2.4 Intermediate values . 40
Annex B (informative) Main information to be supplied to the hose manufacturer. 41
B.1 Main design conditions . 41
B.2 Additional information/requirements dependent on application . 41
Bibliography . 42

European foreword
This document (CEN/TR 14585-3:2017) has been prepared by Technical Committee
CEN/TC 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 rights.
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 braid 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 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 approach 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.
1 Scope
This Technical 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 applicable.
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 hose 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 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 pressure 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 parts
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 or 3.7
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 TS
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
...