EN 14359:2006/FprA1
(Amendment)Gas-loaded accumulators for fluid power applications
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
- Technical Committee
- CEN/TC 54 - Unfired pressure vessels
- Drafting Committee
- CEN/TC 54/WG 5 - Accumulators
- Current Stage
- 5060 - Closure of Vote - Formal Approval
- Start Date
- 15-Oct-2010
- Due Date
- 27-Jun-2011
- Completion Date
- 15-Oct-2010
Relations
- Effective Date
- 18-Jan-2023
- Effective Date
- 19-Dec-2009
Overview
EN 14359:2006/FprA1 (CEN) defines essential requirements for gas-loaded accumulators for fluid power applications, covering materials, design, manufacture, testing, inspection, safety systems and documentation (including instructions for first operation). The standard applies to the pressure-containing envelopes of commonly used accumulator types: bladder, diaphragm, piston, transfer and gas bottles used to provide additional gas capacity.
Key scope conditions specified in the standard include:
- Internal gauge pressure greater than 0,5 bar.
- Working temperature range given as not lower than 50 °C and not higher than +200 °C (as stated in the document).
- Use with Group 2 liquids and gases as defined in the Pressure Equipment Directive 97/23/EC.
- Excludes accumulators for use with dangerous fluids (see notes in the standard).
This amendment draft also updates informative annexes related to fatigue assessment, abacuses for guarantee factor selection and equipment/environment quality severity tables.
Key Topics
- Types covered: bladder, diaphragm, piston, transfer and gas bottle envelopes joined by welding or mechanical means.
- Design & materials: requirements for pressure-containing envelopes including material selection, surface finish and stress concentration considerations.
- Testing & inspection: guidance on fatigue testing, statistical evaluation and validation using the guarantee factor method (illustrated in the amended Annex E).
- Safety systems & documentation: mandatory documentation and first-operation instructions to support safe installation and use.
- Environmental and quality parameters: amended Annex I provides k (quality) and E (severity) value tables to assess equipment condition and environmental severity for fatigue evaluation.
Applications
EN 14359:2006/FprA1 is intended for manufacturers, designers, test laboratories and notified bodies involved in hydraulic and pneumatic fluid power systems where accumulators and gas bottles are used. Practical applications include:
- Hydraulic energy storage and shock absorption in industrial and mobile equipment.
- System designers verifying accumulator envelope integrity for specified pressure and temperature ranges.
- Test labs performing fatigue testing and statistical validation of accumulator families using the guarantee factor and abacus methods.
Benefits of applying the standard:
- Improved safety and traceability through defined documentation and first-operation instructions.
- Consistent fatigue assessment methodology to help demonstrate service lifetime and reliability.
- Harmonised criteria for materials, surface finish and stress concentration affecting design margins.
Related Standards
- Pressure Equipment Directive (PED) 97/23/EC - referenced for fluid group classification (Group 2 fluids).
- ISO 6743-4 - referenced classification for non-dangerous fluids used in fluid power applications.
For manufacturers and testing organisations, EN 14359:2006/FprA1 provides a practical framework to design, validate and document gas-loaded accumulators in compliance with European harmonised practices while focusing on safety, durability and operability.
Frequently Asked Questions
EN 14359:2006/FprA1 is a draft published by the European Committee for Standardization (CEN). Its full title is "Gas-loaded accumulators for fluid power applications". This standard covers: 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.
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.
EN 14359:2006/FprA1 is classified under the following ICS (International Classification for Standards) categories: 17.040.30 - Measuring instruments; 23.100.99 - Other fluid power system components. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 14359:2006/FprA1 has the following relationships with other standards: It is inter standard links to EN 14359:2006+A1:2010, EN 14359:2006. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 14359:2006/FprA1 is associated with the following European legislation: EU Directives/Regulations: 97/23/EC; Standardization Mandates: M/071. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 14359:2006/FprA1 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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.
Contents Page
Foreword .3
1 Deletion of Annex E .4
2 Deletion of Annex F .7
3 Deletion of Annex I . 12
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.
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
i
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
−
Hence, k =()1× 0,37× 0,8 =
...
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