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Guide ped assembly Guiding Principles for the Contents of Particular Materials Appraisals CABF PED SPV N Introduction A Particular Material Appraisal PMA is the process by which the pressure equipment manufacturer demonstrates that each proposed material

Guiding Principles for the Contents of Particular Materials Appraisals CABF PED SPV N Introduction A Particular Material Appraisal PMA is the process by which the pressure equipment manufacturer demonstrates that each proposed material that is not referenced in a harmonised standard or covered by a European Approval for Materials EAM conforms to the applicable Essential Safety Requirements ESR A Particular Material Appraisal is therefore a description of the solutions adopted to meet the essential requirements of the directive where the standards referred to in Article have not been applied and forms part of the Technical Documentation for the pressure equipment The pressure equipment manufacturer must ?rst select material that is suitable for its intended purpose e g resistance to corrosion suitable for subsequent manufacturing processes etc this process is applicable to all materials regardless of whether its source is a harmonised standard a material issued with an EAM or a material assessed through the PMA route As the issue of ??suitability ? material selection is applicable to all sources of material it is not therefore addressed in these guiding principles The Particular Material Appraisal therefore is an appraisal of the proposed material for its compliance with the applicable ESRs for the particular conditions under which the equipment is designed to work This appraisal should result in documentation that describes the material its properties and compliance with the applicable ESRs in a manner that is concise complete and correct Where justi ?able the PMA may be applicable over ranges of parameters appropriate to the manufacture's fabrication scope e g thickness temperature etc providing the assessment is based on the worst case scenario If the material is intended to be used outside this approved range a new PMA is required with appropriate justi ?cations The pressure equipment manufacturer is responsible for the preparation of the documentation for the PMA and where appropriate submits this to the NB for review and approval The NB is required to be involved with the PMA process where the pressure equipment is being assessed in accordance with modules applicable to categories III IV This does not preclude the NB from providing assistance to the manufacturer in the preparation of PMAs to ensure that they are of an appropriate technical quality In any case the pressure equipment manufacturer is responsible for the PMA documentation On completion of the appraisal process the manufacturer may be considered to have demonstrated that the material speci ?cation is acceptable for use in the manufacture of pressure equipment within the range stated in the PMA However manufacturers and where applicable Noti ?ed Bodies must ensure that the material is suitable for each application and that this assessment is recorded in the applicable technical documentation Although PMAs do not provide a ??presumption of conformity ? decisions made in the appraisal of a material for use in a speci ?c set of conditions do not need to be repeated Further appraisals will have to be made if there are any changes in the de ?ned