Clemens Duyvesteijn ExxonMobil Chemical / Refining Atex Introductie Clemens Duyvesteijn ExxonMobil Chemical / Refining
electrical equipment In zone 0 + 1 check marking Unchanged Δ H A C (substantial modi fication ATEX 137) New classified areas (NGG zone) areas w/changed classification (zone, T, group) Substantial modification V V I s Unchanged area classification VVI issued after inspection Review against CENELEC / ATEX 95 standards modifications possible In zone 0,1 resp 20,21 immediate replacement review mainte-nance manage ment system (all zones) In zone 2, 22 immediate check electrical equipment In zone 0 + 1 check marking
EN 1127 and failure mode heuristic Non-electrical equipment H A C FMEAs based on EN 1127 and failure mode heuristic V V I s zone 2 zone 22 zone 0 + 1 zone 20 + 21 Generic IHAs for II A,B + T6 Check during maintenance FMEA for IIC Immediate Check
Portable equipment becomes a temporary workplace ATEX Expert I z o n e 1 + 2 z o n e 0 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 A V I E P D
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 45 Gasturbines Stoomturbine 99 Pompen Centifugaal 66 Verbrandingsmotoren Gas 91 Turbo expanders
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
Evaluate Likelihood and Duration
Determine suitable zone