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    Pressure Equipment Directive

    Summary

    This Directive applies to the design, manufacture and conformity assessment of pressure equipment and assemblies with a maximum allowable pressure greater than 0.5 bar gauge including vessels, piping, safety accessories and pressure accessories. Not all pressure equipment is covered by this directive as The Transportable Pressure Equipment Directive and the Simple Pressure Vessels Directive both cover certain equipment and products which present a relatively low hazard from pressurization are covered by the Machinery Directive.

    The Directive defines a number of classifications for pressure equipment, based on their hazard level which is determined based on stored energy (pressure-volume product) and the nature of the contained fluid. Assessment and conformity procedures are different for each category, ranging from self-certification for the lowest (category I) hazard up to full ISO9001 quality management and/or notified body type examination for category IV equipment. Aspects of the design, production and testing of the equipment are the subject of a large number of harmonized standards to aid compliance with the essential requirements of the directive.

    Manufacturers must also provide adequate instructions with equipment, complete a specified declaration of conformity and maintain a technical file of information about how the equipment was designed and manufactured. Pressure equipment must be marked with the manufacturer, unique identification of model and serial number, the year of manufacture, maximum/minimum allowable pressure limits and the CE logo.

    Scope

    The Directive applies to the design, manufacture and conformity assessment of pressure equipment and assemblies with a maximum allowable pressure greater than 0.5 bar gauge (i.e. 1.5 bar absolute). Vessels, piping, safety accessories and pressure accessories are all included.

    Typical examples of pressure equipment covered include:

    shell and water tube boilers

    heat exchangers

    plant vessels

    pressurised storage containers

    industrial pipework

    as would be used in the chemical, petrochemical, biochemical, food processing and energy industries. However, gas cylinders (including cylinders for breathing air) and certain compressed air equipment, as would be used in any general engineering process, are also included.

    Typical examples of safety accessories include:

    safety valves,

    bursting disc safety devices,

    buckling rods,

    controlled safety pressure relief systems

    and

    pressure switches

    temperature switches

    fluid level switches

    where these are used in safety related applications.

    Exclusions


    The Directive applies only to components and sub assemblies - it does not apply to the “assembly of pressure equipment on site and under the responsibility of the user, as in the case of industrial installations”. There are also a number of other exclusions which cover items of equipment for military use, for use in transport, equipment which presents a relatively low hazard from pressurisation and which is within the scope of another CE mark directive (e.g. theMachinery Directive) and several other classes of equipment.

    Also excluded from the PED are vessels used for the transport of fluids while under pressure (i.e. containers used for the transport of fluids by road, rail, sea and air). These are subject to another directive, the Transportable Pressure Equipment Directive (TPED), which has different attestation and marking requirements (the “pi-mark”). For certain applications, both the CE mark and the Pi-mark are required.

    A further exclusion covers 'simple pressure vessels' which are the subject of a separate directive. This directive essentailly applies to recievers used on compressed air systems.