NF EN ISO 4126-5

NF EN ISO 4126-5

September 2004
Standard Cancelled

Safety devices for protection against excessive pressure - Part 5 : controlled safety pressure relief systems (CSPRS)

ISO 4126-5:2004 specifies the requirements for controlled safety pressure relief systems, irrespective of the fluid for which they are designed. It is applicable to main valves having a flow diameter of 6 mm and above for use at pressures of 0,1 bar (= 0,01 MPa) gauge and above. No limitation is placed on temperature.This is a product standard and is not concerned with applications.

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Main informations

Collections

National standards and national normative documents

Thematics

Sécurité, Gestion des risques et SST, QSE

Publication date

September 2004

Number of pages

34 p.

Reference

NF EN ISO 4126-5

ICS Codes

13.240   Protection against excessive pressure
23.060.40   Pressure regulators

Classification index

E29-417-5

Print number

1 - 21/09/2004

International kinship

ISO 4126-5:2004

European kinship

EN ISO 4126-5:2004
Sumary
Safety devices for protection against excessive pressure - Part 5 : controlled safety pressure relief systems (CSPRS)

ISO 4126-5:2004 specifies the requirements for controlled safety pressure relief systems, irrespective of the fluid for which they are designed. It is applicable to main valves having a flow diameter of 6 mm and above for use at pressures of 0,1 bar (= 0,01 MPa) gauge and above. No limitation is placed on temperature.This is a product standard and is not concerned with applications.

Standard replaced by (1)
NF EN ISO 4126-5
September 2013
Standard Current
Safety devices for protection against excessive pressure - Part 5 : controlled safety pressure-relief systems (CSPRS)

ISO 4126-5:2013 specifies the requirements for controlled safety pressure relief systems (CSPRS) irrespective of the fluid for which they are designed. It is applicable for main valves having a flow diameter of 4 mm and above which are for use at pressures of 0,1 bar gauge and above. No limitation is placed on temperature. ISO 4126-5:2013 is a product standard and is not applicable to applications.

Table of contents
  • Avant-propos
    4
  • 1 Domaine d'application
    5
  • 2 Références normatives
    5
  • 3 Termes et définitions
    6
  • 4 Symboles et unités
    12
  • 5 Conception
    12
  • 5.1 Généralités
    12
  • 5.2 Raccordements d'extrémité
    13
  • 5.3 Prescriptions minimales pour les ressorts
    13
  • 5.4 Matériaux
    13
  • 5.5 Prescriptions et procédures
    13
  • 6 Essais de production
    14
  • 6.1 Objet
    14
  • 6.2 Généralités
    14
  • 6.3 Essai hydrostatique
    16
  • 6.4 Essai pneumatique
    17
  • 6.5 Ajustement de la pression de réglage à froid
    17
  • 6.6 Essai d'étanchéité au siège
    17
  • 6.7 Joints sous pression
    17
  • 7 Essai de type
    18
  • 7.1 Généralités
    18
  • 7.2 Essais de détermination des caractéristiques de fonctionnement
    19
  • 7.3 Essais de détermination des caractéristiques de débit
    20
  • 7.4 Rapports et résultats d'essai
    22
  • 7.5 Détermination du coefficient de débit
    22
  • 7.6 Certification du coefficient de débit
    22
  • 7.7 Certification des DSDCS
    22
  • 8 Détermination des performances d'un DSDCS
    22
  • 8.1 Détermination du coefficient de débit
    22
  • 8.2 Débit critique et sub-critique
    22
  • 8.3 Débit en écoulement critique
    23
  • 8.4 Débit pour tout gaz quelconque en écoulement sub-critique
    23
  • 8.5 Débit pour liquide autre qu'à auto-vaporisation comme fluide d'essai dans la zone de turbulence où le nombre de Reynolds Re
  • 9 Dimensionnement de l'appareil de robinetterie principal
    24
  • 9.1 Généralités
    24
  • 9.2 Appareils de robinetterie pour décharge de vapeur ou gaz
    24
  • 9.3 Calcul du débit
    24
  • 10 Marquage et plombage
    25
  • 10.1 Marquage sur l'enveloppe de l'appareil de robinetterie principal
    25
  • 10.2 Marquage sur une plaque d'identification
    25
  • 10.3 Plombage d'un DSDCS
    25
  • Annexe A (informative) Exemples de calculs de dimensionnement pour différents fluides
    26
  • Annexe ZA (informative) Relations entre la présente Norme européenne et les Exigences Essentielles de la Directive de l'Union Européenne Directive 97/23/CE (DESP)
    30
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