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© 2009 1. Installation procedures in HAE Ralph C Wigg in collaboration with Mr Neil Dennis - AECOM.

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Presentation on theme: "© 2009 1. Installation procedures in HAE Ralph C Wigg in collaboration with Mr Neil Dennis - AECOM."— Presentation transcript:

1 ©

2 Installation procedures in HAE Ralph C Wigg in collaboration with Mr Neil Dennis - AECOM

3 © 2009 WARNING This presentation should be considered only with the associated dialogue. It is important not to take statements contained herein literally but within the context in which they were delivered, understanding also that some of the information contained may not yet exist in AS/NZS published standards and therefore subject to change. 3

4 © 2009 Topics – not necessarily in this order Where are we with adoption of IEC standards Integrating Gas and Dust standards Classification standards update Risk adjusted classifications and applications Installation standards update Non Electrical developments Time frame for Introduction Non-electrical standards 4

5 © 2009 Adoption of IEC Standards 1991 – Standards Australia Committee EL014 decided to pursue the adoption of IEC standards for Hazardous Areas – Strategic plan developed, agreed and adopted – First IEC standards directly adopted without change 2009/2010 – Last of the mainstream IEC standards adopted as AS/NZS standards 5

6 © 2009 Integrating Gas & Dust Standards – series General Requirements Pressurization p Classification - Gases Classification - Dusts Intrinsic Safety i Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 6

7 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Pressurization p Classification - Gases Classification - Dusts Intrinsic Safety i Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 7

8 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p Classification - Gases Classification - Dusts Intrinsic Safety i Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 8

9 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Classification - Dusts Intrinsic Safety i Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 9

10 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Intrinsic Safety i Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 10

11 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Combine Intrinsic Safety i Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 11

12 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Combine Intrinsic Safety i Combine Selection/Installation Inspection & Maintenance Encapsulation m Protection by Enclosure t 12

13 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Combine Intrinsic Safety i Combine Selection/Installation Combine Inspection & Maintenance Encapsulation m Protection by Enclosure t 13

14 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Combine Intrinsic Safety i Combine Selection/Installation Combine Inspection & Maintenance Combine Encapsulation m Protection by Enclosure t 14

15 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Combine Intrinsic Safety i Combine Selection/Installation Combine Inspection & Maintenance Combine Encapsulation m Change number Protection by Enclosure t 15

16 © 2009 Integrating Gas & Dust Standards – series Combine General Requirements Combine Pressurization p No change Classification - Gases Change number Classification - Dusts Combine Intrinsic Safety i Combine Selection/Installation Combine Inspection & Maintenance Combine Encapsulation m Change number Protection by Enclosure t 16

17 © 2009 Classification Standards Road Map AS Gas/Vapour General AS Gas/Vapour Examples AS Dusts AS/NZS AS/NZS Series AS/NZS AS/NZS AS/NZS AS/NZS Pre /

18 © 2009 Use of Standards - Gas/Vapour Generalized Method AS/NZS Annex ZB (AS/NZS ) Other relevant Standards e.g. API, IP, NFPA Examples AS/NZS Annex ZA (AS/NZS series) AS/NZS clause (AS/NZS ) AS/NZS (AS/NZS ) First principles can be used in place of all examples. Highlight examples are not mandatory. 18

19 © 2009 ATEX Principles ATmospherique EXplosive (French) Generalised directive to manage ignition risks for hazardous areas European Union regulation issue: Mandated through European member country legislation Risk based (Risk categories introduced - Cat 1, Cat 2, Cat 3) Address electrical and non electrical issues (e.g. EN1127-1) Compliance to Standards deemed to meet objectives but not the only path Not a certification scheme Initially based on preference of CEN and CENELEC standards but accepts Alternate Standards (IEC) 19

20 © 2009 AS/NZS (IEC) :2009 IEC elements: Gives support to Classification by Calculation. Calculation method is not mandated. Use of alternative models is accepted Qualitative guidance only Hypothetical volumes Average LEL, increased by dispersion profile Used for ventilation assessment – not hazard radius Calculations conservative – 2 or 3 orders of magnitude Hypothetical volumes and zones related but not deterministic Includes useful calculations for release rates Includes Mists information – still unresolved 20

21 © 2009 Gas/Vapour Classifications - Future Gas/Vapour ( ) Further updates to mists (but still hard to define risks) Further advances on new computational tools. Revise calculations for hypothetical volume. Work towards recognizing other standards (IP 15, API- 505 etc) Outstanding questions: How big is a hazard(ous area)? How big is a leak? Do we need guidance on more catastrophic failures? Redefining zone 0 – what is frequent and does it have meaning? 21

22 © 2009 Dust Classifications AS/NZS (IEC) due for adoption IEC due for publication mid 2009 Emphasis on dust cloud hazard. Introduce dust groups IIIA (flyings) IIIB (non conductive) IIIC (conductive) Dust layers identified as a fire risk and may not be hazardous areas (subject to housekeeping & conditions) May prefer to use Ex rated items for fire risk management and not explosion hazards 22

23 © 2009 Current Hazard Management Approach Current Classification and Apparatus is based on fault tree principles. Likelihood of hazard x Likelihood of ignition source = ALARP probability of event. e.g. Zone 1 areas may be hazardous in normal operation and require apparatus with a high integrity from becoming an ignition source. Zone 2 areas are less likely to be flammable and electrical equipment has lower integrity from being an ignition source. Does not consider consequence. Apparent risk may be suggested by individuals fudging classifications. 23

24 © 2009 Risk Adjusted Classifications Accepted in the next edition of IEC standards Progressively to all aspects of hazardous area standards. (2006 to 2011) Fits other frameworks (ATEX, AS/NZS 4360 etc) Guidance is beyond IEC scope – not defined in IEC standards. Application may be country dependent – Australian approach may vary to other countries option As an option to the current prescriptive approach to allow choice of equipment for zones. 24

25 © 2009 IEC : Enabling Risk Adjustment Clause 4.2: Objectives ……….. Subsequent to the completion of the area classification, a risk assessment may be carried out to assess whether the consequences of ignition of an explosive atmosphere requires the use of equipment of a higher equipment protection level (EPL) or may justify the use of equipment with a lower equipment protection level than normally required. The EPL requirements may be recorded, as appropriate, on the area classification documents and drawings to allow proper selection of equipment. ……. 25

26 © 2009 Risk Adjustments - Implementation Annexes to: AS/NZS , AS/NZS and AS/NZS Guidance on when, and process required Not a prescriptive approach – no specific examples Relationship to OH&S regulations to be considered Reasonably Practicable Minimize risk approach Roles of designers to eliminate risks at design stages 26

27 © 2009 Installation Standards Road Map AS/NZS and 17 due mid-late 2009 Parallel with AS/NZS for two years AS/NZS : AS/NZS Dust AS/NZS :1999 AS (Ex d) AS (Ex e) AS/NZS (Ex i) AS/NZS (Ex s) AS (Ex n) AS/NZS Gas AS/NZS (IEC) (IEC with amendments and annexes) AS/NZS (IEC) (IEC with amendments and annexes) AS/NZS (IEC) Gas & Dust Selection & Installation Gas & Dust Inspection & Maintenance

28 © 2009 AS/NZS – IEC generated changes Format and sequence of items – new to AS/NZS Merging Gas and Dust into one standard Introduces Equipment Protection Levels (EPL) to match risk adjusted classifications. Introduce Dust Groups (non conductive, conductive, fibres) Introduce Ex ic (intrinsic safety – zero fault tolerance) New calculations for Ex i energy parameters (reducing limits where both inductance and capacitance are encountered) Thermistors or type tests required for both VVVF and soft starting of motors (all protection techniques) Ex e and Ex n HV motors - special risk factor controls on start up (based on nett risk considering; voltage, No. of starts, environmental, IP rating etc) Ex p considers different designations for different release conditions 28

29 © 2009 EPL Assignment without risk adjustment Table 1 Equipment Protection Levels where only zones are assignedZone Equipment protection levels (EPLs) 0Ga 1Ga or Gb 2Ga, Gb or Gc 20Da 21Da or Db 22Da, Db or Dc 29

30 © 2009 Equipment Marking New marking including EPLs Explosion Protected Protectio n Technique Gas Group Dust Group Temperature Class or Maximum Temperature Max. Dust Depth EPL G – Gas D – Dust Ex t dIIB ExIIIC T4 T130°CT °C Gb Da Similar marking is also being implemented on mechanical equipment 30

31 © 2009 Alternate EPL marking Examples H. ATHERINGTON Ltd TYPE 250 JG 1 Ex e px IIC 125 °C (T4) Gbalternate Ex eb pbx IIC 125 °C (T4) No GHI X BEDELLE S.A TYPE A B 5 Ex d I Mbalternate Ex db I ABC company Type XYZ Serial No Ex ia IIIC T120 °C Da alternate Ex ia IIIC T120 °C IP20 N.A

32 © 2009 AS/NZS AU items AS/NZS key items Update cable requirements in line with AS/NZS Note: IEC does not require SWA cables for zone 1. Maintain options for conditions of control from AS/NZS Maintain ANZEx or IECEx equipment certification preference Add guidance on cable gland selection Maintain AS 1482 for Ex v – building ventilation Maintain references for specific applications e.g. fuel dispensers, spray booths Add guidance on equipment certification review processes (Conformity Assessment Documentation) 32

33 © 2009 AS/NZS AU items AS/NZS key item AS/NZS includes a new Annex for guidance on fitness for purpose assessments for heritage (legacy) plant. Most of the other requirements (for the AS/NZS adoption) are the same as current standards. 33

34 © 2009 AS/NZS AU items AS/NZS key items AS/NZS includes a number of the requirements now given in AS/NZS3800 as an extension to IEC A guide is being worked on that will include a lot of the information currently given in AS/NZS3800 that will become supplementary to AS/NZS to fill the gaps AS/NZS3800 is intended to continue to be in use for a period of at least 2 years after the publication of AS/NZS Likely publication date for the AS/NZS is the first half of 2010 depending on the situation with the standards development process in Australia. 34

35 © 2009 North America progressing to IEC IEC - Links CENELEC standards = IEC (parallel vote) ATEX Electrical & Non-electrical CENISO IECEx - Electrical Equipment - Repair - Competencies (2010) - Mechanical ? (long term) IEC Cenelec 35

36 © 2009 IEC TC 31 Scope change (Mirrored in Australia) Previously ( ) To prepare and maintain international standards relating to the use of electrical apparatus including area classification, the selection and installation, inspection and maintenance, repair, overhaul and modification of electrical apparatus where there is a hazard due to the possible presence of explosive atmospheres of gases, vapours or mists. From 2008 To prepare and maintain international standards relating to equipment for use where there is a hazard due to the possible presence of explosive atmospheres of gases, vapours, mists or combustible dusts. 36

37 © 2009 Non Electrical Standards CEN mechanical standards initially developed in response to ATEX by non electrical groups Specific European mechanical standards - generally based on ignition risk assessment rather than technically specific. Category (or zone) rating variable based on assessments Modified gas/dust criteria to electrical standards (to be reviewed in IEC) ISO responsibility but IEC holds relevant expertise in hazardous areas. ISO and IEC working together in the non electrical field under IEC TC31 37

38 © 2009 EN - Non Electrical Standards EN 13980, EN 1710 – Underground coal mine equipment (priority) Generic standards (Introduced for IEC consideration) EN General EN fr - Flow restricting (limited breathing) EN d - Flameproof (as per electrical) EN c - Construction safety (increased safety) EN b - Ignition control (electro mechanical management systems) EN k - Immersion (as per electrical) Future inherent safety being considered Specific equipment standards e.g. EN (Design of fans) 38

39 © 2009 IEC – Non Electrical Beginning with adoption/modification/restructure of EN standards Already working on mining equipment standards as priority IEC : general requirements – mechanical and electrical ISO/IEC : Basic requirements for mechanical equipment (including ignition hazard assessment) ISO/IEC xx: Mechanical equipment – constructional safety, control of ignition sources, liquid immersion (combined elements from EN standards) IEC : Flameproof – mechanical and electrical IEC : Pressurisation – mechanical and electrical for example 39

40 © 2009 Non Electrical - relationships Consider impact on/input from existing recognised standards API and ISO TC67 oil industry standards – co-adopted Other than EN standards? AS 2809 (road tankers), AS 2229 (fuel dispensers), API 610, ASME PTC9 etc ??? Certification schemes Extension to IECEx – Does industry need or want it? New competencies and inspection regimes – are these warranted? 40

41 © 2009 Going Forward Change is happening – be prepared and consider the issues Communicate and put your views forward Participation and support are desperately needed Questions? 41


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