Gas-loaded accumulators for fluid power applications

This European Standard specifies the requirements for materials, design, manufacture, testing inspection, safety systems and documentation (including instructions for first operation), for commonly-used types of gas-loaded accumulators and gas bottles for fluid power applications (see 1.2).
1.2   This European Standard applies to the following types of components, defined as the pressure-containing envelope of gas-loaded accumulators:
-   bladder type;
-   diaphragm type;
-   piston type;
-   transfer type;
-   gas bottles used to provide additional gas capacity.
They consist of one or several parts joined together by a variety of mechanical means and by welding.
1.3   This European Standard applies to gas-loaded accumulators which operate with the following conditions:
-   subject to an internal gauge pressure greater than 0,5 bar;
-   working temperature of not lower than 50 °C and not higher than +200 °C;
-   containing Group 2 liquids and gases as defined in the Pressure Equipment Directive 97/23/EC.
It does not apply to:
-   accumulators for use with dangerous fluids (see NOTE 1).
NOTE 1   Fluid power applications utilize non-dangerous fluids as categorized in ISO 6743-4 in addition to an inert gas (e.g. nitrogen) which is used as the pre-charging medium.
NOTE 2   There are no design limits to the volume of the accumulator.

Hydrospeicher für Hydraulikanwendungen

Accumulateurs hydropneumatiques pour transmissions hydrauliques

Hidropnevmatski zalogovniki za hidravlične razvode - Dopolnilo A1

General Information

Status
Not Published
Public Enquiry End Date
09-Oct-2010
Technical Committee
Current Stage
98 - Abandoned project (Adopted Project)
Start Date
14-Jan-2011
Due Date
19-Jan-2011
Completion Date
14-Jan-2011

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SIST EN 14359:2007/kFprA1:2010
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SLOVENSKI STANDARD
SIST EN 14359:2007/kFprA1:2010
01-september-2010
+LGURSQHYPDWVNL]DORJRYQLNL]DKLGUDYOLþQHUD]YRGH'RSROQLOR$
Gas-loaded accumulators for fluid power applications
Hydrospeicher für Hydraulikanwendungen
Accumulateurs hydropneumatiques pour transmissions hydrauliques
Ta slovenski standard je istoveten z: EN 14359:2006/FprA1
ICS:
23.100.99 'UXJLVHVWDYQLGHOL Other fluid power system
KLGUDYOLþQLKVLVWHPRY components
SIST EN 14359:2007/kFprA1:2010 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14359:2007/kFprA1:2010
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SIST EN 14359:2007/kFprA1:2010
EUROPEAN STANDARD
FINAL DRAFT
EN 14359:2006
NORME EUROPÉENNE
EUROPÄISCHE NORM
FprA1
July 2010
ICS 17.040.30
English Version
Gas-loaded accumulators for fluid power applications

Accumulateurs hydropneumatiques pour transmissions Hydrospeicher für Hydraulikanwendungen

hydrauliques

This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee

CEN/TC 54.

This draft amendment A1, if approved, will modify the European Standard EN 14359:2006. If this draft becomes an amendment, CEN

members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment

into the relevant national standard without any alteration.

This draft amendment was established by CEN in three official versions (English, French, German). A version in any other language made

by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same

status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14359:2006/FprA1:2010: E

worldwide for CEN national Members.
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SIST EN 14359:2007/kFprA1:2010
EN 14359:2006/FprA1:2010 (E)
Contents Page

Foreword ..............................................................................................................................................................3

1 Deletion of Annex E ...............................................................................................................................4

2 Deletion of Annex F ...............................................................................................................................7

3 Deletion of Annex I ............................................................................................................................. 12

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SIST EN 14359:2007/kFprA1:2010
EN 14359:2006/FprA1:2010 (E)
Foreword

This document (EN 14359:2006/FprA1:2010) has been prepared by Technical Committee CEN/TC 54

“Unfired pressure vessels”, the secretariat of which is held by BSI.
This document is currently submitted to the Unique Acceptance Procedure.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.

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SIST EN 14359:2007/kFprA1:2010
EN 14359:2006/FprA1:2010 (E)
1 Deletion of Annex E
Delete the existing Annex E and replace it with the following:
Annex E
(informative)
Example of application of the method of evaluating and interpreting
fatigue test results carried out on complete accumulators
E. 1 General
E.1.1 General

This annex provides an example of the fatigue assessment of gas-loaded accumulators using the ‘Guarantee

factor method’ as described in 7.6.7.
E.1.2 Consider a population of accumulators with the following characteristics:
 D = 100 mm
 Minimal thickness = 4,2 mm
 PS = 320 bar
 P = 100 bar
 k ⇔ material = Steel (carbon plain) ; Rp = 880 MPa , R = 1 100 MPa
1 0,2% m
 k ⇔ surface finish Ra = 1,6 µm
 k ⇔ stress concentration coefficient κ = 2,5, (typical for a threaded tube)
3 t
E.1.3 Calculation of CVM
For further information, see Annexes H and I.
 CVm = 0,08.
 k : material properties well defined ⇒ k = 1
1 1
 k : Ra = 1,6 µm is the minimum acceptable value ⇒ k = 0,37
2 2

 k : has two boundaries with a generally acceptable range: 1,5 ≤ κ ≤ 3. For values of κ ≤ 2,25 (mid point

3 t t

of 1,5 and 3) then k = 1. For higher values, k is reduced. The stress concentration coefficient of this

3 3
accumulator, κ = 2,5 is slightly above 2,25 hence : ⇒ k = 0,8
t 3
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SIST EN 14359:2007/kFprA1:2010
EN 14359:2006/FprA1:2010 (E)
Hence, k =()1× 0,37× 0,8 =
...

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