EN ISO 25457:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Design
   4.1 Introduction
   4.2 System design
   4.3 Process definition
   4.4 Types of flares
   4.5 Flare burners
   4.6 Mechanical design
   4.7 Pilots
   4.8 Pilot-ignition systems
   4.9 Pilot-flame detection
   4.10 Piping
   4.11 Auxiliary components
5 Mechanical details - Elevated flares
   5.1 Mechanical design - Design loads
   5.2 Design details
   5.3 Materials of construction
   5.4 Welding
   5.5 Inspection
   5.6 Surface preparation and protection
   5.7 Attachments
   5.8 Aircraft warning lighting
   5.9 Platforms and ladders
6 Mechanical details - Enclosed-flame flare
   6.1 Combustion chamber
   6.2 Burners
   6.3 Burner piping
   6.4 Pilots
   6.5 Wind fence
   6.6 Radiation shielding
Annex A (informative) - Flare equipment overview
      A.1 Types of flares and components
      A.2 Flare burner
      A.3 Pilots
      A.4 Ignition equipment
      A.5 Flame-detection equipment
      A.6 Verification test
      A.7 Purge-gas conservation seals
      A.8 Knockout drums and liquid seals
      A.9 Blowers and drivers
      A.10 Blower staging and control equipment
      A.11 Pressure-staging equipment
      A.12 Flow and pressure sensing equipment
Annex B (informative) - Components of multi-burner
                        staged flare equipment
      B.1 Burners
      B.2 Pilots
      B.3 Ignition equipment
      B.4 Flame-detection equipment
      B.5 Buoyancy and velocity seals
      B.6 Manifolds
      B.7 Operations
      B.8 Maintenance
      B.9 Troubleshooting
Annex C (informative) - Enclosed-flame flares
      C.1 Purpose
      C.2 General description
      C.3 Operating considerations for
           enclosed-flame flares
      C.4 Maintenance
      C.5 Troubleshooting
Annex D (informative) - Instructions for flare data
                        sheets
      D.1 Introduction
      D.2 General information forms - Instructions
      D.3 Elevated-flare forms - Instructions
      D.4 Enclosed-flare forms - Instructions
Annex E (informative) - Flare data sheets
      E.1 SI units
      E.2 USC units
Bibliography

ISO 25457:2008 specifies requirements and provides guidance for the selection, design, specification, operation and maintenance of flares and related combustion and mechanical components used in pressure relieving and vapour-depressurizing systems for petroleum, petrochemical and natural gas industries.Although ISO 25457:2008 is primarily intended for new flares and related equipment, it can also be used in the evaluation of existing flare facilities.Further guidance and best practices are provided for the selection, specification and mechanical details for flares and on the design, operation and maintenance of flare combustion and related equipment.ISO 25457:2008 also includes a set of data sheets, together with instructions and guidelines, for use in communicating and recording design information.