halvor erikstein ewhn 2006 organophosphates in turbine oils · 2007-05-13 · organophosphates in...
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Organophosphates in turbine oil
Halvor EriksteinSAFE www.safe.no
RIGAEWHN 29. September 2006
European Work Hazards Network
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http://www.balpa.org/intranet/BALPA-Camp/The-Aircra/index.htm
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Bilde hentet fra AOPIS: ”Contaminated Cabin Air – An Ongoing Health and Safety Issue, 2003” www.aopis.org
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Bilde hentet fra AOPIS: ”Contaminated Cabin Air – An Ongoing Health and Safety Issue, 2003” www.aopis.org
BLEED AIR
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Bilde hentet fra AOPIS: ”Contaminated Cabin Air – An Ongoing Health and Safety Issue, 2003” www.aopis.org
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Bilde hentet fra AOPIS: ”Contaminated Cabin Air – An Ongoing Health and Safety Issue, 2003” www.aopis.org
No problems here?
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To viktige additiver til bl.a MILSPEC 23699
1%N-phenyl-1-napthylamine3%Tricresylfosfat (TCP) 10 isomerer(TOCP, DOCP, MOCP,
TMCP, TPCP, DMCP, DPCP…….)
Bilde hentet fra AOPIS: ”Contaminated Cabin Air – An Ongoing Health and Safety Issue, 2003” www.aopis.org
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• MIL SPEC 23699 Sammenligning av to oljer som møter samme spesifikasjon
Castrol 5000
Exxon 2380
Oppvarming 525 C
C. Van Netten and V. LeungAppl.OccEnv.Hyg Vol 15(3)277-283,2000
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Eksempel på omdanning under høy temperatur.Hvor mange andre slike mekanismer finnes?
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BP Turbo Oil 25, 2197, 2380, 2389
• 2. COMPOSITION/INFORMATION ON INGREDIENTS• Chemical Composition Synthetic base stock. (90 - 100%)• Tris(methylphenyl) phosphate CAS No. EINECS No. 215-548-8
(<3%) 1330-78-5 • (contains <0.1% ortho isomer)• Mixed aromatic amines (<5%)• Hazardous Components• No component is present at sufficient concentration to require a
hazardous classification.
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Standard equipment:3 turbines for power generators
2 turbines for pumps/compressors
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Exhaust pipes from turbines
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Same engines but different environment
Outside, cold air, high air flow
Indoor, ”high temperature”, limited airflow, running for more than 1000 hours without stopping. Much more tolerant to increased oil consumption and leakages
Illustration Illustration AOPIS: ”Contaminated Cabin Air AOPIS: ”Contaminated Cabin Air ––An Ongoing Health and Safety Issue, 2003”An Ongoing Health and Safety Issue, 2003”www.www.aopisaopis.org.org
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Bleed air
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Pressure and temperature through a LM2500
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Surface temp500 – 700 oC
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Turbinoljen skal både smøre og være kjøelmiddel
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• Bearings: The leaking points
• On some offshore installations, the bleed air is used as instrument air and asbreathing air for respiratoryprotection
BLEED AIR
Illustration Illustration AOPIS: ”Contaminated Cabin Air AOPIS: ”Contaminated Cabin Air ––An Ongoing Health and Safety Issue, 2003”An Ongoing Health and Safety Issue, 2003”www.www.aopisaopis.org.org
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”The Sump Philosophy”
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Bearing #1, 2, 3, 4
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The lubrication of bearings
OIL JET
Cavity drain
Air to createoverpressure
Return oil
9000 rpm
Ballbearing
Sump vent
Seals
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Sump vent into the exhaust. Earlier routed ”out”
Vent oil tank
Cavity drain; To the floor under the turbine inside the hood!
All seals leaks, but the amount varies
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Turbine hood and generator layout
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Cavity drain/sump ventAlso used to observethe condition of thesealings
Inside the turbine hood
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Many pipes and hoseswhich may leak.This area must be inspected while the engineis running.
Inside the turbine hood
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Many pipes and hoses which can leak and rupture.Vapors and aerosols hit hot surfaces
Inside the turbine hood
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Always some oil leakage and oil to be removed, sometimes >50 liters
Inside the turbine hood
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The vacuum cleanercreates aerosols
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Outside
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Thermal degradation of lube oil
• Some areas may have temperatures exceeding 500 oC
• This temperature will create thermal decomposition of the oil components
• Some of degradation products will be much more volatile and be vented out into the sump vent.
• One must expect that new compounds will be created by different chemical reactions.
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Locally, very hot surface
Lube oil
Vent systemVolatile compounds from breakdown of oil components: InhalationSkin uptake
Local thermal degradation of lube oil
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Hot zones
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HightemperatureFrictionpressure,
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The 24 hours exposureOther sources for organophosphourous
compounds• The flame retardant Pyrovatex is used in
bedlinen and coveralls– Many reports on itchiness from bedlinen
• Other oils and products with flame retardants based on organophosphourous compounds.
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The absence of proof is not
proof of absence