Transcription
2/21/2012264 Natural Gas:What You ShouldKnowDon MacBrideClick to insert presentersThursday, March 29, 1:15 to 2:15 p.m.Click to insert session day, date and timeThe Basics of Natural GasPresented by:Don MacBrideSafety and Technical TrainingInstructorDominion East Ohio GasNatural Gas Explosion DamageNatural Gas Explosion DamageMyths About Natural GasWhat is Natural Gas?1. It’s easy to burn!2. Produces carbon monoxide when burned!3. CO is an odorless, colorless, silent killer! 95% Methane– Heat content of 850 BTU/CF– Not hot enough to meet federal fuel gas guidelines Remaining 5% Butane 3200 BTU/CF Propane 2500 BTU/CF Ethane 1600 BTU/CF Fingerprint of natural gas1
2/21/2012What is Natural Gas? (cont.)1. Natural Gas is a compound ofcarbon and hydrogen.Methane Ethane Propane Butane H“Natural Gas”CH4 Heat value of 1000 BTU/CFHHH Dominion’s average heat value 1040 BTU/CFThe Combustion Process Required for combustion:CFlammable RangeNatural Gas Concentration In Air100%HOHCOUpper Explosive Limit(UEL)HOOHLower Explosive Limit(LEL)FlammableRange0%Odorant Natural gas is odorless An odorant is added to the gas stream as aprimary safety measure in the industry– TheTh odorantdt aidsid ini LeakL k DetectionD t ti byb CompanyCpersonnel– Allows customers to smell the gas if leaks developinside the home15%4%Odorant Level vs. Flammable Range The odorant is added at a concentration sothat leaks are detectable below 1% gas inair 1%4%15% Odorant levels are routinely checked byCompany personnel2
2/21/2012Flammable Range“Let’s Prove It”Natural Gas Concentration In Air Combustion Chamber Demo100% Depending on the concentration of gas inside astructure, consider the effect venting may have. . . and the possible risks!15%4%0%The Combustion ProcessHHH2OCHH2OH2OH11000 FOOComplete Combustion Yields:OOWater VaporH2OCO2Carbon DioxideCO2Carbon Monoxide ?Carbon Dioxide vs. Carbon MonoxideSo, where does CO come from? Lack of oxygen can cause Carbon Monoxideto be produced during combustionCO2CODi 2Mono 1– Appliances in closet,closet no vents– Plastic on windows / air tight homes– Lack of maintenance of gas appliances3
2/21/2012Not the silent killer 27 “ of Bird Nest MCF 1000 Cubic Feet Standard home burns 20 MCF of natural gaspper month. 1 MCF yields about 11.2 gallons of watervapor So: 20 MCF x 11.2 gallons H2O per MCF 220 gallons of water vapor per month!Air Required for CombustionBlocked Chimney’s Do Not Kill 30 cubic feet of air is required to burn just onecubic foot of gas.It is a lack ofMaintenance on theAppliances. 30 times more air than gas !! Why? Air Required for Combustion (cont.)The Gas Burner . . .Because air contains only 20.9% oxygen.The balance of the air (79%) is nothing morethan inert gasses that has nothing to do withkeeping us alive .Natural GasIt has nothing to do with the combustion process.is a Vacuum!4
2/21/2012Bunsen Burner DemoWhy Aren’t There More Accidents? It’s Hard to Burn Natural Gas!– Must be present within it’s flammable range inorder to burn Odorant Added– The natural gas industry adds an odorant to naturalgas so that customers and the general public cansmell gas at concentrations well below the lowerexplosive limitLP Meter Manifold – InsideOur Residential SystemMeterStopMP Meter ManifoldLP Meter Manifold - OutsideServiceRegulatorMeterStopMeterStop5
2/21/2012The Meter StopCurb ValveCurb ValveTurn-On GasWhat’s involved?Steps performed when turning on gas: Visually inspect the entire piping system for any open ends, proper materialsand proper support. Check the entire piping system for gas leaks. Including performing anInterior Service Line Leak Survey. Light the appliances (furnace, water heater, stove clothes dryer, pool heater,gas light) Inspect the appliances for safe operation (check the ignition, flame, pilot safety,Chimney draft). Red tag the unsafe appliance(s). Check the piping system for atmospheric corrosion Inspect for AtmosphericCorrosion6
2/21/2012The Importance of StressingWinterizingg a Home in ColdClimates7
2/21/2012? Questions ?8
2/21/2012o Points of view, ideas, products, demonstrationsor devices presented or displayed at the Ohiogp do not constituteSafetyy Congress& Expoendorsements by BWC. BWC is not liable forany errors or omissions in event materials.9
Dominion East Ohio Gas Natural Gas Explosion Damage Natural Gas Explosion Damage Myths About Natural Gas 1. It's easy to burn! 2. Produces carbon monoxide when burned! 3. CO is an odorless, colorless, silent killer! What is Natural Gas? 95% Methane - Heat content of 850 BTU/CF - Not hot enough to meet federal fuel gas guidelines
