cali fo rn iacali fo rn ia air resources board proposed amendments to enhanced vapor recovery...
TRANSCRIPT
CALI FO RN IA AIR RESOURCES BOARD
Proposed Amendments to Enhanced Vapor Recovery
Regulations to Standardize Gas Station Nozzle Spout
Dimensions to Help Address Storage Tank Overpressure
October 25, 2018
Vapor
Recovery
Nozzle
Vehicle
Fill Pipe
2
Ongoing Need for Vapor Recovery
Reduce ozone & benzene California Today:
15 billion gallons gasoline/year
3
California’s Vapor Recovery Program
Bulk Plants /
Terminals
Cargo Tanks
Gas Stations
Phase I Vapor Recovery
Dispensing to Vehicles
Phase II Vapor Recovery
4
t t
>90% Emission
Reduction
t
Gallo
ns C
onsum
ed (
Bill
ions)
Em
issio
ns (
Tons p
er
Day)
Reducing Gasoline Emissions Gasoline Consumption Increase of ~50%
15 300
10
0
100
200
>90% Emission
Reduction
5
0 1975 1990 2000 2010
First Vapor Recovery Benzene EVR Rules Rules Adopted ATCM (Enhanced Vapor Recovery)
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Success Through Collaboration
CARB Air Districts Industry
• Establish performance
standards
• Develop test procedures
• Certify new equipment
and control technologies
• Quantify emissions and
reductions
• Develop innovative
control technologies
• Install, operate, and
maintain control systems
• Implement and enforce
rules
• Permit and inspect gas
stations
• Provide data to CARB
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Liquid
Overpressure Issues
1. Emission increases in winter • Benzene emissions:
Potential near source health risk concerns at some sites
CHECK
ENGINE
2. In Station Diagnostic System alarm response costs when no equipment malfunctions
7
What Causes Overpressure?
• Primary Causes: • High Reid Vapor Pressure (RVP)
of winter blend gasoline
• Excess air ingested due to poor seal at interface between vapor recovery nozzles and newer vehicle fill pipes
Today’s Regulatory Proposals
• Site-Specific Factors
8
Vapor+ Air
Liquid
Air Ingestion While Fueling
Vehicle with ORVR*
* ORVR: On-Board Refueling Vapor Recovery
9
System Dynamics While Fueling with Poor Nozzle/Fill Pipe Seal
... . . . .... . .. .... ~ ~ . . . . ·•: · ...... u~ . . . •• • • •• • • • • • • • '.4~· •• .., .... tft., ~ • • •.-: .•.-:· :.... :.... .... , .,. ""'.I: • • • • • • • •••••• ...... • • • ..... .... .!i.• ..................
Liquid
Overpressure After Air Ingestion
0 - +
10
Increasing Trend in Excess Air Ingestion
Fueling Events with Excess Air Ingestion
10%
20%
30%
0%
2004 2007 2010 2012 2014 2015
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Causes of Excess Air Ingestion
1. Capless fill pipes with open drain path
Gap 2. Loose Latch a. Depth of fill pipe locking lip
b. Vapor recovery nozzle design
3. Secondary outer ring (obstructed face seal)
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Proposed Dimensions: Key Terms
Nozzle Bellows (aka boot or
interlock device)
Nozzle Spout
Anchor (latch ring)
13
.,.>
• P: Aspirator Port (also called sensor port automatic shutoff port) or
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SECTION A-A
1' ' ~ ~
✓r 1rtual Sharp
Standardize Nozzle Spout Dimensions
Current:
3 dimensions
D1
L1
L2
Proposed:
15 dimensions
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SECTION B~B
8 3 : 2.5 TIR along contact surfaces (zones shaded to gray)
, I
I I
I
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,,.,,.,------ ............ ,
, ' ,
' ' ' '
\ I
Standardize Nozzle Bellows Dimensions Proposed:
4 dimensions
B4
B
B
15
Conical Nozzle Bellows Cross Section B4 measurement if
bellows is conical/
spherical in shape:
• Public Process
Public Workshops
2012 2013 2014 2015 2016 2017 2018
Overpressure
Workshops*
SAE Task Force
Meetings
Regulatory
Proposals for
Nozzles/Fill Pipes
* Workshops for design and planning for field studies, study results, early regulatory proposals
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Voluntary Improvements to
Vacuum-Assist Nozzle
Improved Latch Ring No Longer Manufactured
Latch Ring on Assist Spout
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Benefits of Improved Assist Nozzle
Emission Reductions* Reactive Organic Gas (ROG)
and Benzene
Cost Savings for Gas Station Operators with
Reduced Frequency of ISD Alarms
~0.94 tons per day (annualized) ~$3.47 million through 2030
~2.85 tons per day (winter)
* Improved assist nozzle reduces overpressure (OP) alarm frequency and associated emissions, but does
not resolve all overpressure concerns. Staff’s fill pipe proposal (next Board item) also will help reduce OP alarm frequency and emissions. Future regulatory proposal will address remaining OP factors.
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Cost of Proposed Amendments Include 16 new dimensions in CARB certification process
Increased CARB Certification Costs
for Nozzle Manufacturers
~$20,520 through 2030 If cost passed to gas stations, ~$2.41 per station*
* Assumes 20% mark-up = ($20,520 * 1.2) ÷ 10,202 gas stations in California
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Staff Recommendations
• Staff recommends that the Board approve
today's proposal to standardize gas station
nozzle spout dimensions
• Staff will continue working to identify
opportunities to address overpressure and
reduce ISD alarm frequency
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