best practices opportunities.ppt · dehydrator reboiler pressure relief valve drain valve...
TRANSCRIPT
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Processor Best Management Practices and Opportunities
Lessons Learned from Natural Gas STAR
Processors Technology Transfer Workshop
Gas Processors Association,Devon Energy, Enogex,
Dynegy Midstream Services andEPA’s Natural Gas STAR Program
April 22, 2005
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Page 2Reducing Emissions, Increasing Efficiency, Maximizing Profits
Processor Opportunities: Agenda
Industry Emissions
Processing Best Management Practices (BMPs)
Selected Methane Saving Opportunities
Eliminate Unnecessary Equipment
Composite Wrap
Leak Inspection & Maintenance
Discussion Questions
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Page 3Reducing Emissions, Increasing Efficiency, Maximizing Profits
Natural Gas and Petroleum Industry Emissions
Processing plants responsible for 36 Bcf of methane emissions annually, and gathering/ booster stations contribute >22 Bcf
Transmission & Storage
98 Bcf
Production/ Gathering/
Booster
150 Bcf
Processing 36 Bcf
Distribution 73 Bcf
25 Bcf
10 Bcf
18 Bcf
1 BcfOil Downstream
2 Bcf
Inventory of U.S. Greenhouse Gas Emissions and Sinks 1990 - 2002
Emissions
Reductions
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Best Management Practices
BMP 2: Install Flash Tank Separators in Glycol Dehydrators Glycol regeneration vents methane
BMP 1: Convert Gas Pneumatic Controls to Instrument Air Gas pneumatic controls bleed methane to the atmosphere
BMP 3: DI&M at Gas Processing Plants and Booster Stations Equipment leaks cause
methane emissions
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Page 5Reducing Emissions, Increasing Efficiency, Maximizing Profits
BMP4: Partner Reported Opportunities (PROs)
Partner Identified and practiced
by Gas STAR partners - your peers
Reported Submitted to EPA in partners’ Annual Reports
Opportunities Peer-identified, cost-effective practices and
technologies to reduce methane emissions
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Page 6Reducing Emissions, Increasing Efficiency, Maximizing Profits
Processor BMPs
Compressor Related
1%
BMP 1: Pneumatics
14%
Storage Related
10%
Pipe Leak Related
7%
Dehydrator Related
1%
Others
37%
Eliminate Unnecessary Equipment
30%
BMP 2: Flash Tank Separators
0%
BMP 3: DI&M
< 1%
86% of the processing sector reductions came from PROs
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Page 7Reducing Emissions, Increasing Efficiency, Maximizing Profits
PRO Fact Sheets
Additional valuable information
Facilitate technology transfer
One page
Easy to review
29 PROs apply to Processing sector
17 focused on operating practices
12 focused on technologies
PRO Fact Sheets are derived from Annual Reports 1994-2003
Total 63 posted PRO Fact Sheets at epa.gov/gasstar/pro/index.htm
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Page 8Reducing Emissions, Increasing Efficiency, Maximizing Profits
Sample of Processing PROs Begin DI&M at Remote Facilities
Convert Engine Starting to Nitrogen
Convert Pneumatics To Mechanical Controls
Eliminate Unnecessary Equipment and/or Systems
Install Electric Starters
Pipe Glycol Dehydrator to VRU
Recycle Line Recovers Gas During Condensate Loading
Replace Ignition –Reduce False Starts
Use Inert Gases & Pigs to Perform Pipeline Purges
Use of Composite Wrap Repair
Overview of PROs
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Page 9Reducing Emissions, Increasing Efficiency, Maximizing Profits
Operating Practice PROs
Eliminate unnecessary equipment and/or systems
Rerouting of glycol skimmer gas
Pipe glycol dehydrator to vapor recovery unit
Inspect and repair compressor station blowdown valves
Begin DI&M at remote facilities
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Page 10Reducing Emissions, Increasing Efficiency, Maximizing Profits
Eliminate Unnecessary Equipment and/or Systems
What is the problem? As operating parameters change over
time, partners have found that certain pieces of equipment initially crucial to operations have become superfluous
Partner solution Take unnecessary equipment out of
service
Methane savings Based on removal of 10 separators and 3
glycol dehydrators
Applicability Applies to all facilities that are operating
well below design levels
Methane Savings
5 to 130,000 Mcf/yr
Project Economics
Project Cost
< $1,000
Annual O&M Costs
< $100
Payback < 1 yr
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Page 11Reducing Emissions, Increasing Efficiency, Maximizing Profits
ExxonMobil
Replaced a 930 horsepower (Hp) compressor with 465 Hp at its Fresh Water Bayou facility in southern Vermilion Parish, Louisiana Total project cost = $30,000
Emissions reductions = 1,556 Mcf/yr
Value Savings: $3/Mcf x 1556 Mcf = $4,668/yr
Took two satellite tanks out of service and began pumping directly to the tank battery Total project cost = $120,000
Emissions reductions = 15,735 Mcf/yr
Value Savings: $3/Mcf x 15,735 Mcf = $47,205/yr
Eliminate Unnecessary Equipment and/or Systems
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Technology PROs
Use of composite wrap repair
Install pressurized storage of condensate
Use ultrasound to identify leaks
Recycle line recovers gas during condensate loading
Convert gas-driven chemical pumps to instrument air
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Page 13Reducing Emissions, Increasing Efficiency, Maximizing Profits
Use of Composite Wrap Repair
What is the problem? Pipeline is shutdown and vented to cut
and weld pipe segment in damaged areas
Partner solution Use composite wrap, which consists of a
filler material, a thin composite wrap and a special adhesive
Methane savings Based on repair frequencies between 2 -
65 times per year
Applicability Suitable for non-leaking defects on
straight sections with up to 80% wall loss and no internal corrosion
Methane Savings
5,400 Mcf/yr
Project Economics
Project Cost
> $10,000
Annual O&M Costs
< $100
Payback Immediate
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Page 14Reducing Emissions, Increasing Efficiency, Maximizing Profits
Use of Composite Wrap Repair
Repairing non-leaking pipeline damage with composite wrap sleeves, such as Clock Spring® Eliminates venting emissions
Inexpensive
Can repair while operating
Non-leaking pipeline defects Corrosion
Dents
Gouges Source: Clock Spring® Company L. P.
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New PROs
Broad dissemination of PROs is key to program success and effective peer-based technology transfer
Zero Emission Dehydrators
Recover Gas from Pipeline Pigging Operations
Nitrogen Rejection Unit Optimization
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DI&M at Gas Processing Plants and Booster Stations
Gas leaks are invisible, unregulated and gounnoticed
Gas STAR Partners find that valves, connectors, compressor seals and open-ended lines (OELs) are major sources 24 Bcf of methane lost from processing plant fugitive
emissions each year
Fugitive methane emissions depend on operating practices, equipment age and maintenance
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Sources of Emissions
PC PC
Compressor
FC
DC LC TC
VC
FTS
FC LC
LC
Energy Exchange
Pump
Dehydrator
Reboiler
PressureReliefValve
DrainValve
Compressor Seal
Pneumatic Controller
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Distribution of Losses by Category
Source: Clearstone Engineering, 2002
Combustion Equipment9.9%
Amine Vents0.5%
Vents and Flares24.4%
Non-leaking Components0.1%
NRU Vents0.3%
Storage Tanks11.8%
Leaking Components53.1%
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Distribution of Leaks by Component
Control Valves
4.2%
4.0%
Open-Ended Lines11.1%
Other Flow Meters0.2%
Orifice Meters0.1%
Pressure Relief Valves3.5%
Valves26.0%
Blowdowns0.8%
Connectors24.4%
CompressorSeals23.4%
Crankcase Vents
Pump Seals1.9%
Pressure Regulators0.4%
Source: Clearstone Engineering, 2002
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Partner Experience
Success #1A leaking cylinder head was tightened, which
reduced methane emissions from almost 64,000 Mcf/yr to 3,300 Mcf/yr. The repair required 9 man-hours of labor, and the annualized gas savings were approximately 60,700 Mscf/yr. The estimated value of the gas saved was $182,100/yr.
Success #2A one-inch pressure relief valve emitted almost
36,774 Mcf/yr. Five man-hours of labor and $125 of materials eliminated the leak. The annualized value of the gas saved was more than $110,300.
Gas values based on $3/Mcf
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Partner Experience Cont.
Success #3A blowdown valve leaked almost 14,500 Mcf/yr.
Rather than replace the expensive valve, the Partner spent just $720 on labor and materials to reduce the emissions to approximately 100 Mscf/yr. The gas saved was approximately 14,400 Mcf/yr, worth $43,200.
Success #4A tube fitting leaked 4,121 Mcf/yr. A very quick
repair requiring only five minutes reduced the leak rate to 10 Mcf/yr. The annualized value of the gas saved was approximately $12,300.
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Page 22Reducing Emissions, Increasing Efficiency, Maximizing Profits
DI&M by Leak Imaging
Real-time visual image of gas leaks Quicker identification & repair of leaks
Screen hundreds of components an hour
Screen inaccessible areas simply by viewing them
Aerial surveillance of flow lines
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Infrared Gas Imaging Technology
Active and passive IR technologies
Shoulder- and/or tripod- mounted
Hand-held prototype 2005
Aerial surveillance applications
Require battery or power cord
Most very large leaks (> 3cf/hr) clearly seen
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Infrared Gas Imaging
Video recording of fugitive leak found by infrared camera
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Discussion Questions
To what extent are you implementing any of these PROs?
What are the barriers (technological, economic, lack of information, regulatory, etc.) that are preventing you from implementing any of these technologies?
How often do you perform DI&M at your processing facility?