Standard
[CURRENT]
ISO 4126-7:2013-07
Safety devices for protection against excessive pressure - Part 7: Common data
German title
Sicherheitseinrichtungen gegen unzulässigen Überdruck - Teil 7: Allgemeine Daten
Publication date
2013-07
Original language
English
Pages
33
Publication date
2013-07
Original language
English
Pages
33
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Content
Content (en)
Foreword
Scope
Normative references
Terms and definitions
Symbols and units
Determination of safety valve performance
Show subsection Close subsection Determination of coefficient of discharge
Critical and subcritical flow
Discharge capacity at critical flow
Show subsection Close subsection Discharge capacity for steam
Discharge capacity for any gas under critical flow conditions
Discharge capacity for any gas at subcritical flow
Discharge capacity for non-flashing liquid as the test medium in the turbulent zone where the Reynolds number Re is equal to or greater than 80 000
Sizing of safety valves
Show subsection Close subsection General
Valves for gas or vapour relief
Calculation of capacity
Show subsection Close subsection Capacity calculation for (saturated, superheated or supercritical) steam at critical flow
Capacity calculations for wet steam
Capacity calculations for gaseous media
Show subsection Close subsection Capacity calculations for gaseous media at critical flow
Capacity calculations for gaseous media at subcritical flow
Capacity calculations for liquids
Thermodynamic properties
Show subsection Close subsection Steam data
Value of C as a function of k
Theoretical capacity correction factors for sub-critical flow (K)
Estimating chart for compressibility factor, Z
Capacity correction factor for viscosity, K
Properties of gases
Minimum requirements for helical compression springs
Show subsection Close subsection General
Materials
Marking
Dimensions
Show subsection Close subsection Proportion
Spring index
Coil spacing
End coils
Spring plates/buttons
Inspection, testing and tolerances
Show subsection Close subsection Permanent set
Dimensional checks
Tolerances
Minimum requirements for safety valve disc springs
Show subsection Close subsection General
Materials
Marking
Dimensions
Show subsection Close subsection Disc spring compression
End squareness and parallelism
Inspection, testing and tolerances
Show subsection Close subsection Permanent set
Load-deflection measurement
Examples of capacity calculations for various media (informative)
Show subsection Close subsection Capacity calculations for gaseous media at critical flow (see 6.3.3.1)
Capacity calculations for gaseous media at subcritical flow (see 6.3.3.2)
Capacity calculations for liquids (see 6.3.4)
Bibliography
Cooperation at DIN
Please get in touch with the relevant contact person at DIN if you have problems understanding the content of the standard or need advice on how to apply it.
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