SN EN ISO 13704 : 2008 CORR 2009

Foreword
1 Scope
2 Terms and definitions
3 General design information
  3.1 Information required
  3.2 Limitations for design procedures
4 Design
  4.1 General
  4.2 Equation for stress
  4.3 Elastic design (lower temperatures)
  4.4 Rupture design (higher temperatures)
  4.5 Intermediate temperature range
  4.6 Minimum allowable thickness
  4.7 Minimum and average thicknesses
  4.8 Equivalent tube metal temperature
  4.9 Component fittings
5 Allowable stresses
  5.1 General
  5.2 Elastic allowable stress
  5.3 Rupture allowable stress
  5.4 Rupture exponent
  5.5 Yield and tensile strengths
  5.6 Larson-Miller parameter curves
  5.7 Limiting design metal temperature
  5.8 Allowable stress curves
6 Sample calculations
  6.1 Elastic design
  6.2 Thermal-stress check (for elastic range only)
  6.3 Rupture design with constant temperature
  6.4 Rupture design with linearly changing temperature
Annex A (informative) - Estimation of remaining tube life
Annex B (informative) - Calculation of maximum radiant section
                        tube skin temperature
Annex C (normative) - Thermal-stress limitations (elastic range)
Annex D (informative) - Calculation sheets
Annex E (normative) - Stress curves (SI units)
Annex F (normative) - Stress curves (USC units)
Annex G (normative) - Derivation of corrosion fraction and
                      temperature fraction
Annex H (informative) - Data sources
Bibliography

Describes the requirements and gives recommendations for the procedures and design criteria used for calculating the required wall thickness of new tubes and associated component fittings for petroleum-refinery heaters.