Transcript (ORAM) presentatie ATEX - BZW Masterclass Veiligheid

Atex Introductie
Clemens Duyvesteijn
ExxonMobil Chemical / Refining
electrical equipment
In zone 0 + 1
check marking
Unchanged
area
classification
Δ HAC
(substantial modi
fication ATEX 137)
New classified
areas
(NGG zone)
areas w/changed
classification
(zone, T, group)
VVI issued after
inspection
review maintenance manage
ment system
(all zones)
Review against
CENELEC / ATEX
95 standards
In zone 0,1 resp
20,21 immediate
replacement
In zone 2, 22
immediate check
Substantial
modification
VVIs
modifications
possible
VVIs
Non-electrical equipment
zone 0 + 1
zone 20 + 21
FMEAs based on
EN 1127 and failure
mode heuristic
VVIs
HAC
FMEA for IIC
Immediate Check
zone 2
VVIs
zone 22
Generic IHAs for II A,B + T6
Check during maintenance
VVIs
Portable equipment
zone
0
zone1+2
becomes a temporary workplace
J S A + foreseeable malfunctions
no V V I
review of spec + working /
maintenance instructions against
intended use by an Expert I
no V V I
ATEX Expert I
Temporary EPD
AVI
EPD
ATEX 137
Ignition Sources
• Hot surfaces
• Flames and hot gases
• Mechanically generated sparks
• Stray Electrical currents
• Static electricity
• Lightning
• Radio frequency (RF) Ignition
• Ultrasonic
• Adiabatic compression and shock waves
• Exothermic reactions (incl. self ignition of dusts)
Apparatuur indeling volgens
OREDA
• Machinerie
• Elektrische apparatuur
• Mechanische apparatuur
• Instrumentatie en beveiliging
Generiek Machinerie volgens
OREDA (zone 2)
• Soort
ExxonMobil typical
• Compressoren
Reciprocating
• Gasturbines
Stoomturbine
• Pompen
Centifugaal
• Verbrandingsmotoren Gas
• Turbo expanders
%
45
99
66
91
Generiek Mechanische
Apparatuur (zone 2)
• Warmtewisselaars
• Leidingen
• Filters
• Reactoren
• Destilatiekolommen
• Tanks
Generieke overige apparatuur
(zone 2)
• Afsluiters
• Mixers
• Centrifuges
• Hulpsystemen (voor pompen,
compressoren etc)
Belangrijkste resultaten voor
zone 2 equipment
• Nader onderzoek voor hete oppervlakken
• Confirm that diesel driven pumps are
located in a Non Hazardous Area
• Anti static belts used to replace current
belts. Confirm all belts are alredy replaced
by anti-static type.
• LP steam used for tracing. Electrical
tracing is Ex certified
Specific Ignition Hazard
Assessment
• ROP 4 Items
• RAP 8 Items
• RAF 25 Items
• Mainly pumps in confined spaces
(Waste Water Treatment Plant)
Specific IHA Procedure
• Collect data (BOM)
Identify Ignition sources
Identify Faulures
Possible ignition sources
Failure effect
(EN 1127-1)
Hot surface
Part of equipment
and/or component
which is affected
Failure mechanism
(initiating event)
Failure causes:
- Mechanical failure
- Control failure
- Power failure
- Human failure
- External hazards
Casing
Dry running
- Control failure
Impeller
Dry running
- Control failure
Shaft
Dry running
- Control failure
Radial bearing
Dry running
- Control failure
Thrust bearing
Dry running
- Control failure
Pump Seals
Dry running
- Control failure
Valves and Piping
Evaluate Likelihood and Duration
Frequency of effective ignition
source
Maximum duration of effective
ignition source
5. not considered as an effective
ignition source
1. undetected
5. not considered as an effective
ignition source
1. undetected
5. not considered as an effective
ignition source
1. undetected
4. rare ignition source
(≤1x/1000yr)
4. self-revealing/
automatic detection (≤1hr)
4. rare ignition source
(≤1x/1000yr)
4. self-revealing/
automatic detection (≤1hr)
5. not considered as an effective
ignition source
1. undetected
5. not considered as an effective
ignition source
1. undetected
Determine suitable zone
Assessment of effectiveness and likelihood of occurrence of potential ignition sources
(EUC, i.e. including existing control measures, but without additional protective measures)
Frequency of effective ignition
source
Maximum duration of effective
ignition source
Ignition source detection method
Criticality Level (IHA Matrix)
Equivalent Fault Tolerance level
without additional protective
measures, suitable for mentioned
hazardous zone.
With outcome FT -1, additional
measures shall be described in next
colomns
5. not considered as an effective
ignition source
1. undetected
No
Ignition
Hazard
5. not considered as an effective
ignition source
1. undetected
5. not considered as an effective
ignition source
1. undetected
4. rare ignition source
(≤1x/1000yr)
4. self-revealing/
automatic detection (≤1hr)
4. rare ignition source
(≤1x/1000yr)
4. self-revealing/
automatic detection (≤1hr)
5. not considered as an effective
ignition source
1. undetected
5. not considered as an effective
ignition source
1. undetected
No
Ignition
Hazard
No
Ignition
Hazard
FT 2 (Cat.1**)
Zone 0/20
IHF ≤ 2.10-3/yr
FT 2 (Cat.1**)
Zone 0/20
IHF ≤ 2.10-3/yr
No
Ignition
Hazard
No
Ignition
Hazard