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KAVIN PresentationAPI RP 500/505Recommended Practice for Hazardous Area Classification of Locations for Electrical Installations at Petroleum Facilities

Presented By K.Kamal Rajkumar OVERVIEWOil and Gas Plants Handle Flammable Materials

Hazardous AreaA hazardous area is defined as an area in which the atmosphere contains, flammable of explosive gases; dusts or vapors. In such an atmosphere a fire or explosion is possible when three basic conditions are met. This Is referred to as the hazardous area or combustion triangle.

SCOPE The Purpose of this API RP 500 is to provide guidelines for classifying Class I, Division 1, Class I, Division 2 locations at petroleum facilities for the selection and installation of electrical equipment.

The Purpose of this API RP 505 is to provide guidelines for classifying Class I, Zone 0, Class I Zone 1, Class I Zone 2 locations at petroleum facilities for the selection and installation of electrical equipment.CLASSIFICATIONLocationFlammable or Combustible MaterialsClass IGases or VaporsClass IIDustClass IIIFibers or FlyingLower Explosive limit:

Concentration of flammable gas, Vapor or mist in air, below which an explosivegas atmosphere will not be formed.

Upper Explosive Limit:

Concentration of flammable gas, Vapor or mist in air, above which an explosivegas atmosphere will not be formed.

CLASS I AREA CLASSIFICATIONAPI 500

API 505

Division 1Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operating conditions.

Zone 0Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or for long periods of time under normal operating conditions.Zone 1Where ignitable concentrations of flammable gases, vapors or liquids can exist some of the time under normal operating conditions.

CLASS I AREA CLASSIFICATIONAPI 500API 505Division 2Where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions.Zone 2Where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions.SAFE AREA(1) Area where the piping system is without valves, fittings, flanges. (2) Area where flammable liquids or vapor are transported only in suitable containers or vessels.(3) Area where permanent ignition sources are present like area where combustion gases are present, for the example flare tips, flare pits, other open flames and hot surfaces.(4) DG set room with adequate ventilation.(5) Oil/gas fired boilers installations.

Showing Relationship between Grade of Release, Presence of flammable mixture and Zone ClassificationGrade of ReleaseFlammable Mixture PresentZoneContinuous1000 or more hours/ Year(10%)0PrimaryMore than 10 or less than 1000 hours / Year (0.1% - 10%)1SecondaryLess than 10 or more than 1 hours / Year (0.01% - 0.1%)2NoneLess than 1 hour/ Year (0.01%)Unclassified

API 500API 505SYMBOLSCLASS I, ZONE 0CLASS I, DIVISION 1CLASS I, ZONE 1CLASS I, DIVISION 2CLASS I, ZONE 2

HAZARDOUS AREA CLASSIFICATION SYMBOLS

Non Enclosed Pumping Well HeadProcess Equipment Vent in a Nonenclosed Adequately Ventilated Area

Relief Valve in a Nonenclosed Adequately Ventilated Area

FLANGES INSTALLATION IN NON ENCLOSED AREA

Hydrocarbon Pressure VesselFPSO HAZARDOUS AREA CLASSIFICATION

Compressor or Pump in an Adequately Ventilated Nonenclosed Area

Pump or Compressor Handling Flammable Liquids or Highly Volatile Liquids

Above Grade Source With Closure

LIQUID GROUPSCLASSIFICATIONFLASH POINTCLASS IIAbove 100 F to Below 140 F CLASS III AAbove 140 F to Below 200 FCLASS III BAbove 200 FGAS GROUPSFlammable Materials are subdivided into groups based on minimum ignition energy Required for igniting them.Typical Gas HazardAPI 500API 505AcetyleneAII CHydrogenBII CAcetaldehyde, Ethylene,Ethylene GlycolCII BGasoline,Methane,PropaneAcetone, AmmoniaDII A

PROTECTION TYPESPROTECTION TYPES

SUMMARY Identify the flammable materials. Identify sources of release and determine grade of release ( and hence Zone 0, 1, 2 or Division 1, 2 ) Determine future and extent of hazardous area.Assign Gas Groups and Temperature Class.Select appropriate Electrical apparatus. No Electrical Equipment shall be located direct path of leakage sources.DISCUSSION HOURTHANK YOU