ISA RP12.24.01 : 1998

Name: ISA RP12.24.01 : 1998
Brand: ISA

Superseded

View Superseded by

RECOMMENDED PRACTICE FOR CLASSIFICATIONS OF LOCATIONS FOR ELECTRICAL INSTALLATIONS CLASSIFIED AS CLASS I ZONE 0, ZONE 1, OR ZONE 2

Available format(s)

Hardcopy

Superseded date

06-15-2014

Language(s)

English

Published date

01-01-1998

Publisher

International Society of Automation

Foreword
1 General
      1.1 Scope
      1.2 References
      1.3 Purpose
2 Definitions and terms
      2.10 Explosive limits
3 Safety and area classification
      3.1 Safety principles
      3.2 Area classification objectives
4 Area classification procedure
      4.1 General
      4.2 Sources of release
      4.3 Type of Zone
      4.4 Extent of Zone
      4.5 Extent of Zone - General comments
5 Ventilation
      5.1 General
      5.2 Main types of ventilation
      5.3 Degree of ventilation
      5.4 Availability of ventilation
6 Documentation
      6.1 General
      6.2 Drawings, data sheets and tables
Annex A (informative) - Examples of source of release
      A.1 - Process plants and facilities
      A.2 - Openings
Annex B (informative) - Ventilation
      B.1 - Natural ventilation
      B.2 - Artificial ventilation
      B.3 - Degree of ventilation
      B.4 - Assessment of degree of ventilation and its
            influence on the hazardous area
      B.5 - Availability of ventilation
      B.6 - Practical guide
      B.7 - Calculations to ascertain the degree of
            ventilation
Annex C (informative) - Examples of hazardous area
                        classification
Annex D (informative) - Use of combustible gas detection
                        equipment
Annex E (informative) - United States major deviations

Deals with classification of hazardous areas where flammable gas or vapor risks may occur, so as to allow proper selection and installation of apparatus used in these hazardous areas. Applies where there may be risk of ignition due to presence of flammable gas or vapor, mixed with air under normal conditions, but does not cover mines susceptible to firedamp, process and manufacture of explosives, areas where risk may arise due to presence of ignitable fibers and dusts, catastrophic failures beyond the concept of abnormality dealt with, rooms for medical purposes and areas where presence of flammable mist could give rise to unpredicatble risk and which need special consideration.

DevelopmentNote	Renumbered as ISA TR12.24.01. (06/2014)
DocumentType	Standard
Pages	78
PublisherName	International Society of Automation
Status	Superseded
SupersededBy	ISA TR12.24.01 : 1998

API 540 : 1999 : R2006	ELECTRICAL INSTALLATIONS IN PETROLEUM PROCESSING PLANTS
API 505 : 1997	RECOMMENDED PRACTICE FOR CLASSIFICATION OF LOCATIONS FOR ELECTRICAL INSTALLATIONS AT PETROLEUM FACILITIES CLASSIFIED AS CLASS I, ZONE 0, ZONE 1, AND ZONE 2
API 540:1999	ELECTRICAL INSTALLATIONS IN PETROLEUM PROCESSING PLANTS

IEC 60050-426:2008	International Electrotechnical Vocabulary (IEV) - Part 426: Equipment for explosive atmospheres
IEC 60079-3:1990	Electrical apparatus for explosive gas atmospheres - Part 3: Spark-test apparatus for intrinsically-safe circuits
NFPA 70 : 2017	NATIONAL ELECTRICAL CODE
ISA 12.13-1 : 1995	PERFORMANCE REQUIREMENTS, COMBUSTIBLE GAS DETECTORS
IP 15 : 2015	PETROLEUM PRODUCTS - DETERMINATION OF POUR POINT
NFPA 30 : 2018	FLAMMABLE AND COMBUSTIBLE LIQUIDS CODE
ISA RP12.13.02 : 2003	INSTALLATION, OPERATION, AND MAINTENANCE OF COMBUSTIBLE GAS DETECTION INSTRUMENTS
NFPA 325M : 1991	FIRE HAZARD PROPERTIES OF FLAMMABLE LIQUIDS, GASES, AND VOLATILE SOLIDS
IEC TR 60079-12:1978	Electrical apparatus for explosive gas atmospheres - Part 12:Classification of mixtures of gases of vapours with air accordingto their maximum experimental safe gaps and minimum ignitingcurrents
ASTM E 659 : 2015 : REDLINE	Standard Test Method for Autoignition Temperature of Chemicals
NFPA 497 : 2017	CLASSIFICATION OF FLAMMABLE LIQUIDS, GASES, OR VAPORS AND OF HAZARDOUS (CLASSIFIED) LOCATIONS FOR ELECTRICAL INSTALLATIONS IN CHEMICAL PROCESS AREAS
IEC 60079-4A:1970	Electrical apparatus for explosive gas atmospheres - Part 4: Method of test for ignition temperature - First supplement. *Note.-This supplement applies also to the second edition of 1975