Transcript Slide 1

©2009
1
Installation procedures in HAE
Ralph C Wigg
in collaboration with Mr Neil Dennis - AECOM
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.
©2009
3
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
©2009
4
Adoption of IEC Standards

1991 – Standards Australia Committee EL014
decided to pursue the adoption of IEC standards
for Hazardous Areas.

1996 – Strategic plan developed, agreed and
adopted.

1999 – First IEC standards directly adopted
without change

2009/2010 – Last of the mainstream IEC
standards adopted as AS/NZS standards
©2009
5
Integrating Gas & Dust Standards – 60079 series
61241-0
60079-0
General Requirements
61241-4
60079-2
Pressurization “p”
60079-10-1
Classification - Gases
61241-10
60079-10-2
Classification - Dusts
61241-11
60079-11
Intrinsic Safety “i”
61241-14
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
©2009
6
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
60079-2
Pressurization “p”
60079-10-1
Classification - Gases
61241-10
60079-10-2
Classification - Dusts
61241-11
60079-11
Intrinsic Safety “i”
61241-14
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
61241-4
©2009
7
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
60079-10-1
Classification - Gases
61241-10
60079-10-2
Classification - Dusts
61241-11
60079-11
Intrinsic Safety “i”
61241-14
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
©2009
8
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
60079-10-2
Classification - Dusts
61241-11
60079-11
Intrinsic Safety “i”
61241-14
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
©2009
9
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
Change number
60079-10-2
Classification - Dusts
61241-11
60079-11
Intrinsic Safety “i”
61241-14
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
61241-10
©2009
10
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
Change number
60079-10-2
Classification - Dusts
61241-11
Combine
60079-11
Intrinsic Safety “i”
61241-14
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
©2009
11
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
Change number
60079-10-2
Classification - Dusts
61241-11
Combine
60079-11
Intrinsic Safety “i”
61241-14
Combine
60079-14
Selection/Installation
61241-17
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
©2009
12
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
Change number
60079-10-2
Classification - Dusts
61241-11
Combine
60079-11
Intrinsic Safety “i”
61241-14
Combine
60079-14
Selection/Installation
61241-17
Combine
60079-17
Inspection & Maintenance
61241-18
60079-18
Encapsulation “m”
61241-1
60079-31
Protection by Enclosure “t”
©2009
13
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
Change number
60079-10-2
Classification - Dusts
61241-11
Combine
60079-11
Intrinsic Safety “i”
61241-14
Combine
60079-14
Selection/Installation
61241-17
Combine
60079-17
Inspection & Maintenance
61241-18
Combine
60079-18
Encapsulation “m”
60079-31
Protection by Enclosure “t”
61241-1
©2009
14
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
Change number
60079-10-2
Classification - Dusts
61241-11
Combine
60079-11
Intrinsic Safety “i”
61241-14
Combine
60079-14
Selection/Installation
61241-17
Combine
60079-17
Inspection & Maintenance
61241-18
Combine
60079-18
Encapsulation “m”
61241-1
Change number
60079-31
Protection by Enclosure “t”
©2009
15
Integrating Gas & Dust Standards – 60079 series
61241-0
Combine
60079-0
General Requirements
61241-4
Combine
60079-2
Pressurization “p”
No change
60079-10-1
Classification - Gases
61241-10
Change number
60079-10-2
Classification - Dusts
61241-11
Combine
60079-11
Intrinsic Safety “i”
61241-14
Combine
60079-14
Selection/Installation
61241-17
Combine
60079-17
Inspection & Maintenance
61241-18
Combine
60079-18
Encapsulation “m”
61241-1
Change number
60079-31
Protection by Enclosure “t”
©2009
16
Classification Standards ‘Road Map’
Pre 1999
1999/2004
AS2430.1
Gas/Vapour
General
AS/NZS
60079-10
AS2430.3
Gas/Vapour
Examples
AS/NZS
2430.3
Series
2005
2009
AS/NZS
60079-10-1
2010
AS2430.2
Dusts
©2009
AS/NZS
61241-3
AS/NZS
61241-10
17
AS/NZS
60079-10-2
Use of Standards - Gas/Vapour
‘First principles’ can be
used in place of all
examples.
Highlight examples are
not mandatory.
Generalized Method
AS/NZS 60079-10-1
Annex ZB
(AS/NZS 2430.3.5)
AS/NZS 60079-10-1
(AS/NZS 60079 -10)
AS/NZS 60079-10-1
clause 5.4.6
(AS/NZS 2430.3.1)
Other relevant
Standards
e.g. API, IP, NFPA
©2009
18
Examples
AS/NZS 60079-10-1
Annex ZA
(AS/NZS 2430.3 series)
ATEX Principles - 2003
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)
©2009
19
AS/NZS (IEC) 60079-10-1:2009
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
©2009
20
Gas/Vapour Classifications - Future
Gas/Vapour (60079-10-1)




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, API505 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?
©2009
21
Dust Classifications

AS/NZS (IEC) 60079-10-1 due for adoption 2010.

IEC 60079-10-2 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
©2009
22
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.
©2009
23
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

As an option to the current prescriptive approach
to allow choice of equipment for zones.
©2009
24
IEC 60079-10: 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. …….”
©2009
25
Risk Adjustments - Implementation

Annexes to:
AS/NZS 60079-10-1,
AS/NZS 60079-10-2 and
AS/NZS 60079-14



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
©2009
26
Installation Standards ‘Road Map’
2004
2005
2009
AS/NZS 61241.1-2:2000
AS/NZS
61241.14 - Dust
AS/NZS (IEC)
60079-14
AS/NZS
2381.1 - Gas
(IEC with
amendments
and annexes)
AS/NZS 2381.1:1999
Gas & Dust
Selection &
Installation
AS 2381.2 (Ex ‘d’)
AS 2381.6 (Ex ‘e’)
AS/NZS (IEC)
60079-17
AS/NZS 2381.7 (Ex ‘i’)
AS/NZS 2381.8 (Ex ‘s’)
AS 1076.6 (Ex ‘n’)

AS/NZS 60079-14 and 17 due mid-late 2009

Parallel with AS/NZS 2381.1 for two years
©2009
27
Gas & Dust
Inspection &
Maintenance
AS/NZS 60079-14 – 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
©2009
28
EPL Assignment without risk adjustment
Table 1
Equipment Protection Levels where only zones are assigned
Zone
Equipment protection levels (EPLs)
0
‘Ga’
1
‘Ga’ or ‘Gb’
2
‘Ga’, ‘Gb’ or ‘Gc’
20
‘Da’
21
‘Da’ or ‘Db’
22
‘Da’, ‘Db’ or ‘Dc’
©2009
29
Equipment Marking
New marking including EPLs
Ex
d
Explosion
Protected
Protectio
n
Technique
Ex
t
IIB
T4
Gb
Gas Group
Dust Group
Temperature
Class or
Maximum
Temperature
Max. Temp @
Dust Depth
IIIC
T130°C
T500185°C
EPL
G – Gas
D – Dust
Da
Similar marking is also being implemented on mechanical equipment
©2009
30
Alternate EPL marking
Examples
H. ATHERINGTON Ltd
TYPE 250 JG 1
Ex e px IIC 125 °C (T4) Gb
No. 56732
GHI 02.0076 X
BEDELLE S.A
TYPE A B 5
Ex d I Mb
ABC company
Type XYZ
Serial No. 123456
Ex ia IIIC T120 °C Da
IP20
N.A. 01.9999
©2009
alternate Ex eb pbx IIC 125 °C (T4)
alternate Ex db I
alternate Ex ia IIIC T120 °C
31
AS/NZS 60079-14 - AU items
AS/NZS key items

Update cable requirements in line with AS/NZS 2381.1
Note: IEC does not require SWA cables for zone 1.

Maintain options for conditions of control from AS/NZS
2381.1

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)
©2009
32
AS/NZS 60079-17 - AU items
AS/NZS key item

AS/NZS 60079-17 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.
©2009
33
AS/NZS 60079-19 - AU items
AS/NZS key items

AS/NZS 60079-19 includes a number of the requirements
now given in AS/NZS3800 as an extension to IEC 60079-19

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 60079-19 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
60079-19

Likely publication date for the AS/NZS is the first half of
2010 depending on the situation with the standards
development process in Australia.
©2009
34
IEC - Links
CEN
ATEX
Electrical
ATEX &
Non-electrical
ISO
Cenelec
IECEx
- Electrical Equipment
- Repair
- Competencies (2010)
- Mechanical? (long term)
IEC
North America
progressing to IEC
CENELEC standards = IEC (parallel vote)
©2009
35
IEC TC 31 Scope change (Mirrored in Australia)
Previously ( 2003 - 2008)
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.
©2009
36
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
©2009
37
EN - Non Electrical Standards

EN 13980, EN 1710 – Underground coal mine
equipment (priority)

Generic standards (Introduced for IEC consideration)








EN 13463 - 1 General
EN 13463 - 2 ‘fr’ - Flow restricting (limited breathing)
EN 13463 - 3 ‘d’ - Flameproof (as per electrical)
EN 13463 - 5 ‘c’ - Construction safety (increased safety)
EN 13463 - 6 ‘b’ - Ignition control (electro mechanical
management systems)
EN 13463 - 8 ‘k’ - Immersion (as per electrical)
Future inherent safety being considered
Specific equipment standards

EN 14986 (Design of fans)
©2009
38
e.g.
IEC – Non Electrical

Beginning with adoption/modification/restructure of EN
standards

Already working on mining equipment standards as priority
IEC 60079-0: general requirements – mechanical and electrical
ISO/IEC 80079-0: Basic requirements for mechanical equipment
(including ignition hazard assessment)
ISO/IEC 80079-xx: Mechanical equipment – constructional safety,
control of ignition sources, liquid immersion
(combined elements from EN standards)
IEC 60079-1: Flameproof – mechanical and electrical
for example
IEC 60079-2: Pressurisation – mechanical and electrical
©2009
39
Non Electrical - relationships

Consider impact on/input from existing
recognised standards




Certification schemes


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 ???
Extension to IECEx – Does industry need or want it?
New competencies and inspection regimes – are
these warranted?
©2009
40
Going Forward
Change is happening
– be prepared and consider the issues
Communicate and put your views forward
Participation and support are desperately needed
Questions?
©2009
41