BS EN 14359:2017 pdf download.Gas-loaded accumulators for fluid power applications.
1.1 BS EN 14359 specifies the requirements for materials, design, manufacture, testing inspection, safety equipment configuration and documentation (including instructions for first operation), for commonly-used types of gas-loaded accumulators and pressure vessels used to provide additional gas capacity for fluid power applications (see 12).
1.2 BS EN 14359 applies to the following types of components, defined as the pressurecontaining envelope of gas-loaded accumulators:
— bladder type;
— diaphragm type;
— piston type;
— transfer type;
— pressure vessels used to provide additional gas capacity.
They consist of one or several parts joined together by a variety of mechanical means and by welding.
3.1.6
pressure vessels – providing additional gas capacity
inter-connected pressure vessels consisting of body and, depending upon construction, port assemblies used to provide additional gas capacity and communicating with the gas chamber of the accumulator by means of a pipe connection
3.2 Symbols and units
For the purposes of BS EN 14359, the following symbols and units apply.
4.1 Requirements for metallic materials
The pressure containing envelope of gas-loaded accumulators shall be constructed of either:
— harmonized materials used for the manufacture of unfired pressure vessels and meeting the requirements of EN 13445-2;
— materials other than those specified in EN 13445-2 provided that they have been accepted by a particular material appraisal;
— materials covered by European approval for materials in accordance with Article 15 of Pressure Equipment Directive 2014/68/EU.
., .
Where there is a risk of corrosion, a protection method and/or corrosion allowance shall be applied to the affected surfaces of the accumulator.
Consideration must be given to the potential for corrosion due, both to the internal fluid and external environment. This should be countered by methods including, but not limited to, choice of corrosionresistant materials or the use of linings or coatings.
Oniy completely impervious, sufficiently thick and chemically stable layers with an average life, not less than that of the pressure vessel, shall be considered to be reliable protection against corrosion. When in doubt, corrosion tests shall be undertaken.
If there is no contact between the corrosive agent and the vessel base material, then it is not necessary to provide a corrosion allowance for wastage of the base material.
Where the accumulator will be subjected to more than 500 pressure cycles between P2 and P1, the manufacturer shall make an assessment for the effects of fatigue, either by analysis or test. This assessmentshall form part of the Technical File.
Clauses 17 and 18 of EN 13445-3:2014 shall be used as the basis for a fatigue analysis and Th of this European Standard shall be used as the method for conducting a fatigue cycling test.
Figure 2 shows the design process to be adopted.BS-EN-14359-2017