EN 1591-1:2013

Foreword
1 Scope
2 Normative references
3 Notation
4 Requirements for use of the calculation method
5 Checking the assembly for a specified initial
  tightening bolt force (or torque)
6 Calculation parameters
7 Forces
8 Load limits
Annex A (informative) - Dimensions of standard
        metric bolts
Annex B (informative) - Tightening
Annex C (informative) - Flange rotations
Annex D (informative) - Use of the calculation
        method
Annex E (informative) - Gasket/flange face friction
        coefficients examples
Annex F (normative) - Determination of Delta[eGc,l],
        based on a given P[QR]
Annex G (informative) - Sealing gasket parameter
        when no leakage rate is specified
Annex H (informative) - Alternative calculation procedure
        taking into account the plastic deformation
        of the gasket in subsequent load conditions
        procedures (after assembly)
Annex I (informative) - Available, incomplete models
        for conversion of the leakage rates in different
        conditions (based on certain flow models)
Annex ZA (informative) - Relationship between this
         European Standard and the Essential
         Requirements of EU Directive 97/23/EC
Bibliography

This European Standard defines a calculation method for bolted, gasketed, circular flange joints. Its purpose is to ensure structural integrity and control of leak tightness. It uses gasket parameters based on definitions and test methods specified in EN 13555.The calculation method is not applicable to joints with a metallic contact out of the sealing face or to joints whose rigidity varies appreciably across gasket width. For gaskets in incompressible materials, which permit large deformations, the results given by the calculation method can be excessively conservative (i.e. required bolting load too high, allowable pressure of the fluid too low, required flange thickness too large, etc.).