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ELECTRICAL RISK MANAGEMENT IN HAZARDOUS INDUSTRIES & SELECTION OF ELECTRICAL EQUIPMENT FOR FLAMMABLE ATMOSPHERES P.G. Sreejith pillai_sreejith@hotmail.com
P.G.Sreejith, Kerala
Hydrocarbon Risks OISD Accident compilation (1996-1999): Out of the total 71 accidents (5 lakh property loss/fatality/loss of 500MH/led to plant SD ), 66% were fire accidents 47% accidents happened during operational jobs Causes of accidents: - 71% human error - 11% Failure of plant - 18% Presence of ignition source
Is the above accident cause grouping correct?
Hazardous Areas-Definitions Petroleum Rules, 1976
An area shall be deemed to be a hazardous area, where: petroleum having FP below 65 deg C or any inflammable gas or vapour in concentration capable of ignition is likely to be present petroleum or any inflammable liquid having FP above is likely to be refined, blended or stored at or above its FP
IS 5572 Hazardous area is an area in which an explosive gas atmosphere is present, or likely to be present, in quantities such as to require special precautions for the construction, installation and use of electrical apparatus.
COAL MININING SAFETY & CRUDE WAYS OF DETECTING METHANE GAS!! In the 1700's, certain gases or the lack of oxygen were detected with various hit and miss types of detection. The candles on miners caps, or if carried by the miner, would either go out from the lack of oxygen or the flame would get larger with a different coloring of the flame if certain gases were in the area. Of course, in some instances these open flames caused fires or explosions. By 1815, the Davy's Safety Lamp came into use in the mines. This certainly changed the way for miners to check for certain gases. They took these canaries in small cages with them down the coal mines where they worked. The canaries were the miners alarm signal to show them when the coal-gas levels got too high. The canary stopped singing and was most likely to be laid feet up on the bottom of the cage, poisoned by the mine gas.
Why Area Classification? HAC is a method of analyzing and classifying the environment where explosive gas atmospheres may occur to allow the proper selection of electrical apparatus to be installed in that environment. Ignition sources not considered ESD Sparks Lightning Flames/Fires Hot surfaces
IS 5572 HAs are classified in zones based on the frequency of the appearance and the duration of an explosive gas atmosphere.
Why Zoning? Leak Potential & Presence of Ignition Sources
Hazardous properties of hydrocarbons
Safe selection (& optimization) of Electrical Equipment
AREA CLASSIFICATION How many Zones as per Indian standards?
European & American classifications (Zones and Divisions)
Why not blanket zoning?
Is the 4th Zone really a safe zone?
Who should do HAC-Electrical or Process Engineer?
HAC as per IS 5572 is not applicable for:
Mining applications Explosive manufacturing Areas where ignitable dusts & fibers are present
Ignition sources other than electrical apparatus
Zone 0 -Typical areas (Continous grade) Vapour space above:
closed process vessels, storage tanks closed containers, areas containing open tanks of volatile, flammable liquid
How to identify Zone 1 areas (IS 5572) ? (Primary grade) Flammable gas or vapour concentration is likely to exist in the air under normal operating conditions Flammable atmospheric concentration is likely to occur frequently because of maintenance, repairs or leakage Flammable liquid or vapour piping system (containing valves, meters, or screwed or flanged fittings) is in an inadequately ventilated area The area below the surrounding elevation or grade is such that flamamble liquids or vapours may accumulate therein
Zone 1 -Typical areas Imperfectly fitting peripheral seals on floating roof tanks
Inadequately ventilated pump rooms for flammable gas or for volatile, flammable liquids Oily waste water sewer / basins Loading / unloading gantries of hazardous products
Typical Zone 2 areas (IS 5572) ? (Secondary grade) The system handling flammable liquid or vapour is in an adequately ventilated area and is so designed and operated that the explosive or ignitable liquids, Vapours or gases will normally be confined within closed containers or closed systems from which they can escape only during abnormal conditions such as accidental release of a gasket or packing The flammable vapours can be conducted to the location as through trenches, pipes or ducts Locations adjacent to Zone 1 areas Pressurized rooms where flammable gas / vapour can enter in the case of failure of positive mechanical ventilation
Safe Areas -Typical areas The following locations are considered safe from the point of view of electrical installation: Areas where the piping system is without valves, fittings, flanges or similar appurtenances Areas where flammable liquids or vapours are transported only in suitable containers or vessels Areas where permanent ignition sources area present like area where combustion gases are present, for example flare pits, tips, other open flames 7 hot surfaces DG shed room / shed having adequate ventillation GT installation meeting the ventilation (12 ACPH) , pressurization (0.5 mbar )and flange (not more than one pair of flanges inside the turbine room) requirements
HAC- Comparison North America (NFPA / API/ NFPA 70E or NEC) Hazardous Areas: - Division I- Z0 + Z1 - Division II- Z2 Hazardous Locations - Class I-Flammable Gases / Vapour - Class II- Combustible dust - Class III- Combustible fibres or flyings Gas / vapour grouping - A, B, C, D, E, F & G Japan Hazardous Areas - Classes 1, 2 & 3 Gas / vapour groups - G1, G2, G3, G4, G5 & G6
A FEW RELEVANT DEFENITIONS Flash Point - A, B, C
Explosive Limits (based on MIE) LEL
HAZARDOUS AREA CLASSIFICATION-Guidelines Factors to be considered (IS 5572)
Vapour / Gas Density
Effect of Air Current
Identification of leak scenarios
GENERAL CONSIDERATIONS In the absence of walls, enclosures, etc. & air currents, vapour/gas dispersion will depend on density & velocity. Denser gas/vapour will disperse downward and outward, lighter gases upward & outward.HA for a single leak source would be a circle.
Vapours / gas released(high density releases) at or near ground level, will be found below ground, thus altering the shape of HA.
Winds alter the shapes of hazardous areas
A mild breeze may extend the HA and a strong wind could dilute the flammable concentration,making it non-hazardous
But what are logically to be considered are the most unfavourable conditions
HEAVIER-THAN-AIR GASES & VAPOURS Open -Air Situations (freely ventilated Process Areas) Figures 1 ,2) Figures 3 & 4 In case of petroleum pipelines (where well-maintained valves, fittings, and meters and in well-ventilated areas or in a pit), Zone 2 A/G shall be 4m in all directions, from the potential leak source. Pit will be considered as Zone 1. Zone 1
(unless separated by a fire wall)
Zones 1 or 2
LIGHTER-THAN-AIR GASES & VAPOURS Vapour density of 0.75 is considered as the boundary between lighter and heavier gases / vapours as a safety measure HA of a leak source located in air Source of hazard 4.5 m
8.0 m R 4.5 m H<4.5m Zone 2
How to classify areas? Mark in elevation and plan drawings
Separate identification (hatching) for various zones Zone 0 Zone 1 Zone 2
Frequency of HAC?
An experienced process engineers judgement in visualizing leak scenarios and classifying hazardous areas is the most CRUCIAL factor in the HAC exercise
API RP 500- HAC Guidelines
Accident record of the plant / business group / industry sector/maintenance standard adopted in the plant
Sound judgement & Experience of the engineer who carries out HAC
AREA CLASSIFICATION AS A TOOL FOR RISK ASSESSMENT A LOGICAL APPROACH
Perceived Limitations on the present HAC approach: Ignition sources not considered Reduction of zone areas & relaxation of zone designations not considered Blinkers -On Approach , High cost, blanket zoning, narrow & easy approach
or in short, the full potential of HAC is not utilized at present
AREA CLASSIFICATION AS A TOOL FOR RISK ASSESSMENT EXTENDING HAC PROCEDURE Additional steps - After applying the present HAC procedure, assess all ignition sources - Assess the grade of release using HAC-based risk assessment matrix - Assessing the ventilation & evaporation aspects of the chemicals considered Applying the new HAC procedure
HAC-based Risk Assessment Matrix
Grade of Igniti on Grade of Release Continous Continous Frequent Unacceptable Infrequent Unacceptable unless low consequences Risk Assessment required-look at consequences Acceptable (E.g. Ex n apparatus) Very Infrequent Acceptable (e.g. Ex i apparatus) Acceptable (e.g. Ex d apparatus ) Acceptable
Risk Assessment required-look at consequences but probably unacceptable Acceptable but examine catastrophic releases
Risk Assessment required-look at consequences but
Acceptable but examine catastrophic releases
AREA CLASSIFICATION AS A TOOL FOR RISK ASSESSMENT CONCLUSION
A logical extension of the present HAC methodology & not a radical approach
New European legislation, ATEX 118a Directive will be on similar lines
The new focussed & practical HAC approach will make HAC exercise more cost-effective
A SAFE APPROACH?
COMPARISON OF ZONES & DIVISIONS
Time that haz. gases are present in ignitable Continuously Normally present Occasionally in normal operations
Estimated % (Divisions)
Estimated % (Z)
>60% >95% <40%
Z1 Z2 D2
PERCENTAGE OF CLASSIFIED AREAS
C L A S S I F I E D A R E A S
HAC- A RECAP
HAC-RELEVANT INTERNATIONAL STANDARDS
API RP 500- Area Classification of Petroleum Installations
IEC 79-10 :1995 -Electrical Apparatus for Explosive Gas Atmospheres, part 10 Classification of hazardous areas IP Part 15, 1990- Area Classification Code for Petroleum Installations BS EN 60079-10, : 1996 -Electrical Apparatus for Explosive Gas Atmospheres, part 10 Classification of hazardous areas BS 5345, 1983-Selection, installation and maintenance of electrical apparatus for use in potentially explosive atmospheres (other than mining applications or explosive manufacturing), part 2, Recommendations for particular industrial situations
USEFUL REFERENCE BOOKS ON HAC Classification of Hazardous Locations,I.Chem. E. Cox, A.W., Lees, F.P. and Ang, M.L, 1990 IP Model Code of Safe Practice, 1990, Part 15, Area Classification Code for Petroleum Installations NFPA 69, 1992, Explosion Prevention Systems
ICI/RoSPA, 1972, ICI Electrical Installations Code
NFPA 325M, Properties of Flammable Liquids, gases and solids Electrical Safety in Hazardous Locations, William Calder & Ernest C. Magison
SELECTION OF ELECTRICAL EQUIPMENT IN HAZARDOUS AREAS How to select equipment for various zones?
Gas Grouping (based on ignition energy)
Temperature Classification Classified Zones
450 300 200 135 100 85
Gas group I Methane
Gas group II A Ammonia, CO, Propane, Butane, Benzene, Acetone, Methanol
Gas group II B Butadiene, Ethylene, Ethylene Oxide, Diethyl Ether
Gas group II C Hydrogen Which is the most hazardous group ?
GAS GROUP & TEMPERATURE CLASSIFICATION-VARIOUS GASES/VAPOURS (IS 13408 Part I)
S No Name of the chemical
Minimum Ignition Curre nt (MIC) mA
Flash point Deg. Cen.
Iignition temperatur e (Deg C)
Flammable limit LEL UEL
Ammonia II A T1
Ethylene II B T2
Propane II A T1
Acetylene II C T2
GAS GROUP & TEMPERATURE CLASSIFICATIONVARIOUS GASES/VAPOURS
Gas Group I II A IIB IIC
Representative Gas
Ignition Energy (mj)
Methane Propane Ethylene Hydrogen
280 260 95 18
FLAMMABLE MIXTURE, MIG, EXPLOSION
RECOMMENDED PROTECTION METHODS FOR
No electrical equipment should be allowed. When this is not practicable, Ex i (ia or ib) apparatus or circuits to be used
No transformers, motors, lights, switch gear or control gear
RECOMMENDED PROTECTION METHODS FOR Motors- Ex d, Ex p Transformers & Capacitors - Ex d Control & Instrument Transformers - Ex i Lighting Fitting - Ex d Switch Gear & Control Gear - Ex d Communication/ Telephone equipment/Meters - Ex i Portable Hand Lamps- Ex i *Ex o, Ex q type equipment are also allowed for use as per IS 5571
RECOMMENDED PROTECTION METHODS FOR Motors- Ex d, Ex p, Ex n, Ex e, Transformers & Capacitors - Ex d, Ex p (auxiliary devices to be located in pressurized room/hermetically sealed / intrinsically safe) Control & Instrument Transformers - Ex i
Lighting Fitting - Ex d, Ex e, Ex n
Switch Gear & Control Gear - Ex d, Ex o, Ex Communication/ Telephone equipment/Meters - Ex i
Portable Hand Lamps- Ex i
* Minimum IP 55 (for UN-insulated parts) and IP 44 (for insulated parts) if Ex e protection is used for outdoor applications
EXPLOSION-PROTECTION METHODS / EQUIPMENT -Popular types Flameproof (EX d)
Increased Safety (Ex e )
Non-Sparking (Ex n )
Pressurization (Ex p )
Intrinsically Safe (Ex i )
OTHER TYPES OF EXPLOSION PROTECTION- Not so popular types
Powder filled Ex q type
Oil immersed Ex o type
Special Ex s type
Definition as per IS 2148: EX d Type FLAMEPROOF EQUIPMENT US- Explosion-Proof, UK- Flame-Proof, GERMANY - Pressure-Proof
A type of protection in which the parts can ignite an explosive atmosphere are to be placed in an enclosure, which can withstand the pressure developed during internal explosion of an explosive mixture, and which prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure
FLAMEPROOF EQUIPMENT- A MISNOMER?
FLAMPROOF (EXPLOSION-PROOF) PROTECTION (Ex Assumptions based in IS 2148 are: Flammable gases / vapours, if present in atmosphere will enter the enclosure The apparatus will be selected, installed, operated and maintained within the acceptable ratings. The maintenance and use of FLP equipment shall be so that its safety will not be impaired, is the responsibility of the user The electric circuit of the FLP equipment will have all required protection devices Sparking which will ignite a flammable gas or vapour, may occur at any part of the equipment contained in the enclosure in normal operation due to an internal fault due to insulation failure, etc.
FLAMPROOF (EXPLOSION-PROOF) PROTECTION (Ex
FLAME PATH - Width of Joint Minimum
GAP - Diametrical Clearance Maximum
Maximum gaps and flame path for gas groups depends on ignition energies of the gas / vapour and the volume of the enclosure
For example, for IIB gas group, for 100 Cubic cm volume, for flanged joints: Flame Path - 6 mm Maximum Gap - 0.3 mm
For II C Hydrogen, 100 cubic cm volume, for flanged joints: Flame path - 9.5 mm Maximum Gap - 0.1 mm
FLAMEPROOF EQUIPMENT- CONSTRUCTIONAL REQUIREMENTS
USE OF APPROVED MATERIAL WITHOUT THE USE OF INCENDIVE FRICTIONAL SPARKING
EQUIPMENT SHOULD WITHSTAND ROUGH USAGE
EQUIPMENT SHALL BE ADEQUATELY STRONG TO WITHSTAND ALL REQUIRED TESTS THE EFFECTIVE THREADED METAL TO METAL JOINTS SHALL HAVE A MINIMUM OF 5 FULL UNINTERRUPTED ENGAGED THREADS & A MINIMUM EFFECTIVE UNINTERRUPTED DIRECT AXIAL LENGTH OF THREADED ENGAGEMENT OF 9 mm THERE SHALL BE NO INTENTIONAL GAP BETWEEN JOINT SURFACES NO PACKING MATERIAL SHALL BE USED BETWEEN OPPOSED SURFACES TO FORM A FLAMEPROOF JOINT IF COMPRESSIBLE PACKING MATERIAL OR A GASKET IS NECESSARY TO SEAL A JOINT (eg. IP) THE PACKING SHALL BE APPLIED AS A SUPPLMENT TO, BUT SHALL NOT BE INCLUDED IN THE FLAMEPROOF JOINT ANY DISPLACEMENT, DAMAGE, INTEGRATION OR OMISSION OF THE PACKING SHALL NOT RESULT IN THE FLAMPROOF NATURE OF THE JOINT BEING ADVERSELY
FLAMEPROOF EQUIPMENT- CONSTRUCTIONAL FEATURES
EX d typical marking:
EEx d IIB T5
INTRINSICALLY SAFE EQUIPMENT & CIRCUITS (Ex Definition as per IS 5780
INTRINSICALLY SAFE EQUIPMENT & CIRCUITS (Ex (insert a small photo)
Only electrical protective measure (protection technology by way of power limitation), the other protective techniques use mechanical means to prevent ignition from electrical faults (max. 30 volts or 50 mA)
Ex i apparatus is the one which has all the circuits within intrinsically safe
Ex i circuit is the one which has intrinsically safe barriers with Zenner diodes for power limitation
Minimum IP 20 ingress protection
INTRINSICALLY SAFE EQUIPMENT- Category-
1.5 in normal operation and with one fault 1.0 with one fault, if the equipment contains no unprotected switch contacts in parts likely to be exposed to a potentially explosive atmosphere and the fault is self-revealing
EX i typical marking:
EEx ia IIC T5
INTRINSICALLY SAFE EQUIPMENT (Ex
Cell phone explosion accident in an offshore platform
Fuel outlets- restricted cell phone usage?
INCREASED SAFETY EQUIPMENT (Ex e)
Definition as per IS 6381
A type of protection by which measures are applied so as to prevent with a minor degree of security, the possibility of excessive temperature and the occurrence of arcs or sparks in the interior and the external parts of electrical apparatus which does not produce them in normal service
INCREASED SAFETY EQUIPMENT (Ex e) Stringiest construction methods to ensure that no sparks, excessive temperature are produced Careful terminal design Use of good quality insulation material Use of special materials to protect the enclosure against impact, ingress of dust & moisture Can be used for I, II A, B, C gas groups Permitted for us in T1, T2, T3 classes only Terminal with minimum IP 54 ingress protection
EEx e IIA T3
PRESSURIZATION TYPE (Ex Definition as per IS 7389
PRESSURIZATION TYPE (Ex TYPES
Dynamic Pressurization (DP) or pressurization by continuos circulation of protective gas (purging)
DP is a method of maintaining pressure in an enclosure in which after purging the protective gas is passed continously through the enclosure at a pressure above that of the specified minimum and discharged to the outside atmosphere Static Pressurization or pressurization with leakage compensation - Air supplied & pressurized continously from a non-hazardous area to avoid ingress of flammable gases / vapour inside the enclosure
PRESSURIZATION TYPE (Ex
Pressurized Equipment Ingress protection minimum IP 4X Over pressure 1.5 times or 0.2 kPa
Material of construction should be flame retardant, self- extinguishing and should not be affected by protective gas
Pressurized Equipment / Panels A minimum overpressure of 0.2 kPa (2mbar) with reference to external atmospheric pressure Air intake from a safe area Exhaust duct outlet to be located in safe area Zone 1- can be used if there is no spark in normal service Zone 1 or 2 -if ejection of spark is prevented by effective device and rapid suction of external atmosphere is prevented
Minimum actions of Failure of Protective Gas for Ex p
Enclosure does not contain Ignition-capable apparatus No Action required Alarm
Enclosure contains I-C Apparatus Alarm Alarm with trip
NON-SPARKING TYPE EQUIPMENT (Ex Definition as per IS 8289
EX n typical marking:
EEx n II T5
NON-SPARKING TYPE EQUIPMENT (Ex
Equipment construction in such a way that in normal operation, it is incapable of igniting a surrounding explosive atmosphere and a fault incapable of causing ignition
Restricted breathing type
Careful design of terminals - SUBSTANTIAL COST SAVING
Applications Tools Equipment
POWDER FILLED TYPE EQUIPMENT (
Ex q)
Equipment enclosure filled with quartz /sand so that in normal operating condition, any arc occurring within the enclosure of electrical equipment will not ignite the surrounding atmosphere
No ignition shall be caused either by flame or by excessive temperature of the surfaces of the enclosure Enclosure constructional features: High mechanical strength
Powder filled Insulation of enclosed equipment
OIL IMMERSED TYPE EQUIPMENT (Ex
Protection technique in which the equipment or its parts are immersed in oil in such a way that an explosive atmosphere which, may be above the oil or outside the enclosure cannot be ignited.
Oil used shall be mineral oil confirming to relevant standards
Constructional features: Fully enclosed, leak-proof enclosure Oil level indicator Transformers, Switch gears, Control gears
SPECIAL TYPE EQUIPMENT (Ex
This is a concept that has been adopted to permit the certification of those types of equipment which by their nature, do not comply with the constructional or other requirements specified for equipment with established types of protection but which, nevertheless, can be shown, wherever necessary, by test to be suitable for use in hazardous areas in prescribed zones This concept permits flexibility on the part of certifying and assessment authorities in their approach to applications for certification of equipment the use of which would otherwise not permitted in hazardous areas on account of non-compliance with the requirements of standards for established types of protection. This allows flexibility of approach to innovative ideas and new designs, the development of which otherwise be obstructed. Examples: Factory sealed hand lamps, Encapsulation (Ex m type), Gas detection apparatus
Add an appropriate photo
Insert a IP photo with gasket Ingress of Liquid
Degree of Protection of persons against contact with or moving parts inside the enclosure & Protection Of Equipment against Solid P.G.Sreejith, Kerala ingress
IP Types and Protection Details
FIRST NUMERAL 0 No protection 1 Objects greater than 50 mm 2 Objects greater than 12 mm
SECOND NUMERAL 0 No protection 1 Vertically dripping 2 Angular dripping
3 Objects greater than 2.5 mm
4 Objects greater than 1.0 mm 5 Dust - protected 6 Dust tight
3 Sprayed water
4 Splashed water 5 Water jets 6 Heavy seas
7 Effects of immersion
8 Indefinite immersion
Indian Standards for Various Protection Techniques IS 5571 Guide For Selection Of Electrical Equipment For Hazardous Areas IS 5572 Part I Classification of Hazardous Areas for Electrical Installations
IS 13408 Part I, II, III Code of Selection, Installation and Maintenance of Electrical Apparatus for Use in Explosive Atmospheres IS 8239 Classification of Maximum Surface Temperature of Electrical Equipment for Use In Explosive Atmospheres IS 6381 Construction and testing of Electrical Apparatus with type of protection e IS 2148 Flameproof Enclosures of Electrical Apparatus
IS 13346 General Requirements for Electrical Apparatus for Explosive Gas Atmospheres IS 5780 Specification For Intrinsically Safe Electrical Apparatus and Circuits
IS 8240 Guide for Electrical Equipment for Explosive Atmospheres
IS 2147 Degrees of Protection Provided by Enclosures For Low Voltage Switch Gear & Control Gear IS 4691 Degrees of Protection Provided by Enclosures For Rotating Electrical Machinery
IS 8241 Methods of Marking for Identifying Electrical equipment for Explosive Atmospheres
IS 8224 Specification for Electric Lighting fitting for Explosive Atmospheres IS 8289 Electrical Equipment with Type of Protection n
IS 7389 Specification for Pressurized Enclosures
IS 2206 (PART I,III) Specification for Flame proof Electric Light Fixtures
INSTALLATION & MAINTENANCE OF ELECTRICAL EQUIPMENT IN HAZARDOUS AREAS
INSTALLATION GUIDELINES OF ELECTRICAL EQUIPMENT IN HAZARDOUS AREAS (IS 5571)
Adequate precautions to avoid ESD & Lightning to be implemented
Use of light alloy (Mg, Al, Ti, ) material to be assessed critically in HAs due to its incendive properties
Where reasonably practical, electrical apparatus generally and switch & control apparatus should be installed outside the Hazardous Areas
Electrical apparatus may be installed in open air in a non-hazardous area
INSTALLATION GUIDELINES OF ELECTRICAL EQUIPMENT IN HAZARDOUS AREAS Equipment designed for higher gas groups can be used for less hazardous gas groups ( for e.g., Equipment certified for II C can be used for II A, B or I) Portable hand-lamps, communication equipment and other test equipment shall be Ex i type
All equipment shall be installed so as to avoid mechanical damage
Earthing shall be carried out as per IS 3043 Bonding of all pipeline flanges should be carried out so as to avoid Electro-static discharges Internal earthing to be provided for all FLP equipment in addition to external earthing
INSTALLATION GUIDELINES OF ELECTRICAL EQUIPMENT IN HAZARDOUS AREAS All circuits and apparatus in Hazardous Areas should be provided with means to ensure quick disconnection in the event of any fault (O/C, S/C or E/F) Protection & Control apparatus shall be normally located in non-HAs but if unavoidable, they may be of the right protection type All electrical apparatus (for every apparatus or sub-groups) should be provided with an effective means of isolation, including neutral Metal conduits, armoured cables Correct terminations using proper sized cable glands (doublecompression, FLP type) Unused cable openings of all electrical apparatus shall be closed with plugs suitable for the type of protection
INSTALLATION GUIDELINES OF ELECTRICAL EQUIPMENT IN HAZARDOUS AREAS Copper or Aluminium (above 16 sq. mm only) conductors can be used
FLP plugs & sockets should have preferably PUSH-IN, TWIST-ON type to avoid ignition while insertion or removal Adequacy of IP equipment
Test equipment Insulation Resistance megger shall be Ex i type Earth Megger shall be Ex i type Hotspot Detection equipment
MAINTENANCE RECOMMENDATIONS IN HAZARDOUS AREAS FLP Equipment All bolts in place All openings closed No site modification / alteration Internal & external earthing Double-Compression, FLP cable glands No physical damage No damage to Flame path All threaded connections-minimum 5/ 6 threads engagement Flange faces to be smooth & original (to be careful while opening stuck covers)
MAINTENANCE RECOMMENDATIONS IN HAZARDOUS AREAS Light alloy paint even for the purpose of maintenance must not be applied on any external surface of the equipment to prevent inscendve frictional sparking Equipment shall not be tampered to open covers, etc. No components shall be added or removed or even replaced. This has to be done after getting re-certified by the OEM A scheme of regular inspection & maintenance of the items should be made on the basis of guidelines / standards. Any equipment which is originally flameproof may loose its integrity if not maintained properly The equipment should be de-energized before attempting any repair
MAINTENANCE RECOMMENDATIONS IN HAZARDOUS AREAS Drawings /Records Updated SLD Updated HAC drawing Drawing with various equipment installed in various identified zones Certification / re-certification records IR / ER records Sufficient Spare stock of critical equipment (various Ex types) Solid obstruction(steel structures, walls, other electrical equipment) effects (close to equipment flanges) IIC - 40 mm clearance IIB - 30 mm II A - 10 mm I - no clearance envisaged
MAINTENANCE RECOMMENDATIONS IN HAZARDOUS AREAS Integrity of IP equipment Use of gasket is permitted if certified as part of the equipment No sealing of flange faces (this could affect the ability of the enclosure to withstand the maximum explosion pressure) Application of non-setting grease or anti-corrosive agent is permissible Non-hardening tape can be used in II A gas groups, II B tape is to be avoided and no use of tape in II C gas groups Insulation integrity to be periodically tested and maintained Maintenance personnel Inspection, Maintenance, testing, replacement and repair in HAs shall be carried out by trained personnel only Refresher training for them is essential
MAINTENANCE RECOMMENDATIONS IN HAZARDOUS AREAS
Periodic examination of flange gaps and flange faces for any effects of corrosion / damage, etc.
Maintenance Tests (at an interval not exceeding 3 years) IR measurements Earth electrode resistance measurements Earth loop resistance measurements Operation & Setting of Protection devices
MAINTENANCE RECOMMENDATIONS FOR VARIOUS Ex Types (except Ex d) Ex i - No addition / alteration of circuit components / power limitation barriers, etc. Check Ex p equipment / panels / rooms for low pressure interlock operations, periodic review of air in take stack location Terminations in Ex e, n types equipment Use of non-sparking tools
ELECTRICAL EQUIPMENT USED IN HAZARDOUS ARAES ARE SPECIAL AND THEY NEEDS TO BE TREATED SPECIAL
STATUTORY REGULATIONS & APPROVAL REQUIREMENTS
Approval / Testing Agencies CMRI (Central Mining Research Instituite), Dhanbad, BIHAR
CCoE (Chief Controller of Explosives), Nagpur
DGMS (Director General Mine Safety), Dhanbad, BIHAR
DGFASLI (Director General of Factory Advice Service and Labour Instituites), Mumbai
Statutory Regulations For Plants Utilizing Hydrocarbons
Petroleum Act, 1884 Petroleum Rules, 1976 Explosive Act, 1934 Explosive Rules, 1983 Gas Cylinder Rules, 1981 Static & Mobile pressure Vessel (Unfired) Rules, 1981 CCoE, Department of Explosives is entrusted with the responsibility of administration of the above statutory rules in India
Petroleum Rules, 1976 (Chapter IV)
Static & Mobile Pressure Vessels (U) Rules, 1981 ( Rule 31)
Gas Cylinder Rules, 1981 (Rule 21)
EXTRACTS FROM PETROLEUM ACT, 1934
Hazardous Area- Definition An are shall be deemed to be an hazardous area, where: i) petroleum having FP below 65 deg. C or any other flammable gas or vapour in concentration capable of ignition is likely to be present ii) petroleum or any inflammable liquid having FP above 65 deg centigrade is likely to be refined, blended, handled or stored at or above its FP
HAC- Zones 0, 1, 2 Earth resistance values: 4 ohm for electrical systems 10 ohms for non-current carrying metallic parts all joints in pipelines, valves, etc. shall be bonded and the earth resistance between each joint shall be 1 ohm
Hazardous Areas as per 4th Schedule: -In-line with IS 5571
Tables 1 & 2 (as per Form XIII) Inter-Distances between tanks (with Classes A, B, C products) Distance between tanks and tankers, offices, motors
CMRI, Dhanbad -Approval Agency for Electrical Equipment for Use In Hazardous Areas
Equipment testing and approvals (for all gas groups- I, II A, IIB, IIC)
Testing and approval required for modified equipment
Equipment Approval Procedure
Drawing and prototype submittal to CMRI Tests by CMRI
Approval by CMRI
ISI Certification (Tests by CMRI) as per applicable Indian Standards
Approvals by:
DGFASLI CCoE
ELECTRICAL SAFETY AUDITING IN HAZARDOUS AREAS
Original HAC drawings (IS 5572) Plant additions / alterations Installation of electrical equipment in hazardous areas (IS 5571) Valid applicable statutory approvals (CCoE) Maintenance of Electrical Equipment FLP Pressurized equipment Earthing (internal & external)
European ATEX Directive Advantages include CLEAR Zone marking, stringent quality requirements, very user-friendly Products will have to be re-certified as per the new harmonized ATEX standards CAT 3 (Zone 2) products will not require approval from a notified body (could be self-certified, if in-house test facilities are available) Use Directive ATEX137 Protection of workers at Risk from Potentially Explosive Atmospheres Another directive for user industries Will be mandatory under EU laws in 2003 Requirements - Documented evidence of analysis, HAC, inspections carried out - Use of ATEX certified (E & M) equipment & safety systems
Auditing Checklists OISD 145 (Section 9)
IS 5571
IS 5572
IS 13408 Part I, II, III (Code of practice for selection, installation & maintenance of Electrical equipment in potentially Explosive atmospheres)
VARIOUS EXPLOSION PROTECTION TECHNIQUES
INSTALLATION , MAINTENANCE & AUDITING GUIDELINES
European ATEX Directive ATEX Directive 94/9/EC is adopted by the EU members & is concerning technical & legal requirements applicable for potentially explosive atmospheres CE marking is a pre-requisite if products are to be used in EU nations ATEX directive 100a will become mandatory on July 1, 2003
Equipment groups (non-mining) CAT 1 (Zone 0) CAT 2 (Zone 1) CAT 3 (Zone 2)
CHOLAMANDALAM AXA RISK SERVICES LTD. COMPANY PROFILE
JV between Cholamandalam Investment & Finance Co. Ltd. (Part of Murugappa group) and AXA Insurance of France Offers customized Risk Management solutions to industrial clients in ASIA, which include: Business Continuity Planning, Risk Analysis, Electrical Safety Audits, Safety Audits as per IS 14489, Specialized safety training, Review of Fire Protection systems, etc. (as per NFPA, BIS, OISD,API, etc.)
LET US MAKE OUR REFINERIES SAFER !!!
THANK YOU!!! P.G.Sreejith
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