API 505 : 1997

1 SCOPE
2 REFERENCES
3 ACRONYMS AND ABBREVIATED DEFINITIONS
4 BASIC CONDITIONS FOR A FIRE OR EXPLOSION
5 FLAMMABLE AND COMBUSTIBLE LIQUIDS, GASES,
   AND VAPORS
6 CLASSIFICATION CRITERIA
7 EXTENT OF A CLASSIFIED LOCATION
8 RECOMMENDATIONS FOR DETERMINING DEGREE
   AND EXTENT OF CLASSIFIED LOCATIONS - COMMON
   APPLICATIONS
9 RECOMMENDATIONS FOR DETERMINING DEGREE
   AND EXTENT OF CLASSIFIED LOCATIONS IN PETROLEUM
   REFINERIES
10 RECOMMENDATIONS FOR DETERMINING DEGREE
   AND EXTENT OF CLASSIFIED LOCATIONS AT DRILLING
   RIGS AND PRODUCTION FACILITIES ON LAND AND ON
   MARINE FIXED PLATFORMS
11 RECOMMENDATIONS FOR DETERMINING DEGREE AND
   EXTENT OF CLASSIFIED LOCATIONS ON MOBILE OFFSHORE
   DRILLING UNITS (MODUS)
12 RECOMMENDATIONS FOR DETERMINING DEGREE AND
   EXTENT OF CLASSIFIED LOCATIONS AT DRILLING RIGS
   AND PRODUCTION FACILITIES ON FLOATING PRODUCTION
   UNITS
13 RESERVED FOR FUTURE USE
14 RECOMMENDATIONS FOR DETERMINING DEGREE AND
   EXTENT OF CLASSIFIED LOCATIONS AT PETROLEUM
   PIPELINE TRANSPORTATION FACILITIES
APPENDIX A - SAMPLE CALCULATION TO ACHIEVE ADEQUATE
             VENTILATION OF AN ENCLOSED AREA BY NATURAL
             MEANS USING EQUATIONS 1 AND 2
APPENDIX B - CALCULATION OF MINIMUM AIR INTRODUCTION
             RATE TO ACHIEVE ADEQUATE VENTILATION USING
             FUGITIVE EMISSIONS
APPENDIX C - PREFERRED SYMBOLS FOR DENOTING CLASS I,
             ZONE 0, ZONE 1, AND ZONE 2 HAZARDOUS
             (CLASSIFIED) AREAS
APPENDIX D - INFORMATIVE ANNEX - AN ALTERNATE METHOD
             FOR AREA CLASSIFICATION
APPENDIX E - PROCEDURE FOR CLASSIFYING LOCATIONS
ANNEX F (INFORMATIVE) - ALTERNATE VENTILATION CRITERIA

Gives guidelines for classifying locations Class I, Zone 0, Zone 1, and Zone 2 locations at petroleum facilities for the selection and installation of electrical equipment.