NEN EN 1591-1 : 2014

Foreword
1 Scope
  1.1 General
  1.2 Requirement for use of the Calculation method
  1.3 Validity
2 Normative references
3 Notation
  3.1 Use of figures
  3.2 Subscripts and special marks
  3.3 Symbols
  3.4 Terminology
4 Calculation parameters
  4.1 Flange parameters
  4.2 Bolt parameters
  4.3 Gasket parameters
5 Internal forces (in the joint)
  5.1 Applied loads
  5.2 Compliance of the joint
  5.3 Minimum forces necessary for the gasket
  5.4 Internal forces in assembly condition (I = 0)
  5.5 Internal forces in subsequent conditions
      (I = 1,2, ...)
6 Checking of the admissibility of the load ratio
  6.1 General
  6.2 Bolts
  6.3 Gasket
  6.4 Integral flange and collar
  6.5 Blank flange
  6.6 Loose flange with collar
Annex A (informative) Requirement limitation of
                       non-uniformity of gasket stress
Annex B (informative) Dimensions of standard metric bolts
Annex C (informative) Scatter of bolting-up methods
Annex D (informative) Assembly using torque wrench
Annex E (informative) Flange rotations
Annex F (informative) Diagram of calculation sequence
Annex G (informative) Joints with spacer seated flanges
Annex ZA (informative) Clauses of this European Standard
                       addressing essential requirements
                       or other provisions of the PED
Bibliography

Specifies a calculation method for bolted, gasketed, circular flange joints. Also ensures structural integrity and control of leak tightness.