UNE-EN 12110:2003

Foreword
Introduction
1 Scope
  1.1 Description of the machine(s)
2 Normative references
3 Terms and definitions
4 List of significant hazards
  4.1 Mechanical hazards
  4.2 Electrical hazards
  4.3 Thermal hazards
  4.4 Noise hazards
  4.5 Hazards generated by materials and substances processed,
      used or exhausted by machinery, for example:
  4.6 Hazards generated by neglecting ergonomic principles in
      machine design (mismatch of machinery with human
      characteristics and abilities) caused e.g. by:
  4.7 Hazards caused by failure of energy supply, breaking
      down of machinery parts and other functional disorders,
      e.g.:
  4.8 Hazards caused by (temporarily) missing and/or incorrectly
      positioned safety related measures/means, e.g.:
5 Safety requirements and/or protective measures
  5.1 General requirements
      5.1.1 Calculation
      5.1.2 Pressure relief valve
      5.1.3 Electrical equipment
      5.1.4 Control panel
      5.1.5 Communication
      5.1.6 Doors, closing and sealing
      5.1.7 Fire protection
      5.1.8 Handling of heavy items
  5.2 Personnel locks
      5.2.1 Number of chambers
      5.2.2 Dimensions
      5.2.3 Seats
      5.2.4 Door openings, dimensions
      5.2.5 Doors, closure
      5.2.6 Minimum equipment for personnel locks
      5.2.7 Other requirements
      5.2.8 Ventilation
      5.2.9 Protection against breaks in flexible lines
      5.2.10 Oxygen breathing (including all gas mixtures with
             more than 25% oxygen)
  5.3 Material locks
  5.4 Combined locks
  5.5 Pressure bulkheads
      5.5.1 Sealing
      5.5.2 Service ports
6 Verification of safety requirements and/or protective measures
7 Information for use
  7.1 General
  7.2 Signals and warning devices
  7.3 Instruction handbook
  7.4 Marking
Annex ZA (informative) - Relationship of this document with EC
                         Directives
Bibliography

Applies for the design, construction, equipping, marking and testing of air locks and pressure bulkheads, which are to be used in tunnelling work. Covers the oxygen breathing installation used to provide the breathing supply necessary to conduct a safe decompression. Deals with all significant hazards, hazardous situations and events relevant to air locks and pressure bulkheads, and specifies the appropriate technical measures to eliminate or reduce risks arising from the significant hazards.