NF EN ISO 4126-7

NF EN ISO 4126-7

September 2013
Standard Current

Safety devices for protection against excessive pressure - Part 7 : common data

ISO 4126-7:2013 specifies requirements for safety valves. It contains information which is common to ISO 4126-1 to ISO 4126-6 to avoid unnecessary repetition.

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Main informations

Collections

National standards and national normative documents

Thematics

Sécurité, Gestion des risques et SST, QSE

Publication date

September 2013

Number of pages

45 p.

Reference

NF EN ISO 4126-7

ICS Codes

13.240   Protection against excessive pressure
23.060.40   Pressure regulators

Classification index

E29-417-7

Print number

1 - août 2013

International kinship

ISO 4126-7:2013

European kinship

EN ISO 4126-7:2013
Sumary
Safety devices for protection against excessive pressure - Part 7 : common data

ISO 4126-7:2013 specifies requirements for safety valves. It contains information which is common to ISO 4126-1 to ISO 4126-6 to avoid unnecessary repetition.

Replaced standards (1)
NF EN ISO 4126-7
January 2004
Standard Cancelled
Safety devices for protection against excessive pressure - Part 7 : common data

Table of contents
  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    1
  • 4 Symboles et unités
    4
  • 5 Détermination des performances d'une soupape de sûreté
    5
  • 5.1 Détermination du coefficient de débit
    5
  • 5.2 Écoulements critique et sub-critique
    5
  • 5.3 Débit en écoulement critique
    5
  • 5.4 Débit pour tout gaz en écoulement sub-critique
    6
  • 5.5 Débit pour liquide non auto-vaporisant comme le fluide d'essai dans la zone de turbulence où le nombre de Reynolds Re est supérieur ou égal à 80 000
    7
  • 6 Dimensionnement des soupapes de sûreté
    7
  • 6.1 Généralités
    7
  • 6.2 Soupapes pour décharge de vapeur ou de gaz
    7
  • 6.3 Calcul du débit
    7
  • 7 Propriétés thermodynamiques
    10
  • 7.1 Données relatives à la vapeur d'eau
    10
  • 7.2 Valeurs de C en fonction de k
    10
  • 7.3 Facteurs de correction du débit théorique pour écoulement sub-critique (Kb)
    10
  • 7.4 Diagramme d'estimation pour le facteur de compressibilité, Z
    10
  • 7.5 Facteur de correction de débit pour la viscosité, Kv
    22
  • 7.6 Propriétés des gaz
    23
  • 8 Exigences minimales applicables aux ressorts hélicoïdaux à compression
    24
  • 8.1 Généralités
    24
  • 8.2 Matériaux
    24
  • 8.3 Marquage
    25
  • 8.4 Dimensions
    25
  • 8.5 Coupelles/rondelles de ressort
    25
  • 8.6 Inspection, essais et tolérances
    26
  • 9 Exigences minimales applicables aux ressorts à rondelles élastiques de soupape de sûreté
    28
  • 9.1 Généralités
    28
  • 9.2 Matériaux
    28
  • 9.3 Marquage
    28
  • 9.4 Dimensions
    28
  • 9.5 Inspection, essais et tolérances
    28
  • Annexe A (informative) Exemples de calculs de débit pour différents fluides
    30
  • Bibliographie
    35
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