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NH Stage I/II Vapor Recovery
Program
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Overview of NH Gasoline VaporRecovery Program
Regular
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Benefits of Gasoline Vapor Recovery
Reduces VOC emissions by up to 95 percent.
Reduces exposure to toxics and carcinogens.
GASOLINE
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Vapor Recovery Cycle
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Stage I Vapor Recovery- Two Point- Coaxial- Teed
GASOLINE
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Vapor Collection at Station
Two Point System
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Stage I Dry Break
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Stage II Vapor Recovery
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Vapor Collection from Vehicle Tank
Gas to CarVapor Return
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• Stage I required on tanks 1100 gal & greater
• Stage I required on delivery trucks servicing eligible tanks
• Stage II required in Hillsborough, Merrimack, Rockingham, & Strafford Counties, at stations with 420,000 gal and above yearly throughput
• Stage II no longer required, now must be decommissioned by December 22, 2015
• Certification required for all stations Stage II certification requires test and is only good for up to 3 years
Stage I certifications are good until a change ismade to the system
Summary
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NH Vapor Recovery Rule Changes
• Stage I required for all tanks 1100 gal or larger
• Stage II testing required until system is decommissioned
• Stage II testing changes
• Nozzle ratio testing required • Testing of Pressure Vacuum Vent Caps required
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Pressure Decay Testing
Back Pressure Testing
Pressure/Vacuum Cap Testing
Nozzle Testing
Healy System Testing
-
-
-
-
-
Stage II Testing
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Pressure Decay Testing
•NH requires 10" w.c. initial pressure
•Pressure is maintained for 5 minutes
•Allowable decay is determined based on tank ullage
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Common Pressure Decay Problems
•Loose fittings
•Pipe fittings•Dry breaks
•Covers
•Leaking spill bucket plungers
•Nozzles
•Check valves
•Breakaways
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Common Pressure Decay Problems (Cont.)
• No Drop Tube
• Wrong Fittings
• Gasoline Storage Tanks Filled within Three Hours of Test
• No Testing Tees
• Slip On Type P/V Vent Cap on Threaded Vent Pipe
• Leaking Test Equipment
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• Dry Test20,60 & 100 CFH Nitrogen
• Wet TestGasoline flow back to tank 60 CFH
• Dry Break Propped Open
• Gauge Shouldn't Pulsate
Back Pressure Testing
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Back Pressure Problems
• Liquid Traps in Vapor Return Line
• Traps in Dispenser Vapor Piping
• Dispenser Hose Not Drained
• Poor Seal on Testing Fixture
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Vapor Return Piping Problems
to underground storage tank
Vacuum Motor
Vacuum MotorTrap
DISPENSER
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Pressure Vacuum Cap Testing
Pressure Tested to +/- .5 w.c.
Vacuum Tested to +/- 2 "w.c.
Cap Must be Vertical
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Pressure/Vacuum Vent Cap Tester
VacuumTransducer
+
_
P/V Vent Cap
0" - 5" W. C.
Gauge
(Pressure)
0" - 10" W. C.
Gauge
(Vacuum)
must be verticalfor testing( )
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Pressure Vacuum (P/V) Vent Caps
Required on all Stage I/II Systems
Stage II Vapor Recovery Systems
Pressure: 3 " w.c. Vacuum: 8 " w.c.
Stage I Vapor Recovery Systems
Pressure: 8 oz/square inch Vacuum: 1/2 oz/square inch
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Nozzle Ratio Testing
Air to Liquid RatioRatio Computed at STPFlow Meter RequiredAllowable Ratios Based on CARB Certifications
Vapor to Liquid Ratio Testing Allowed
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Nozzle Testing Problems
Insufficient Gasoline Flow Rate
Poorly Fitting Nozzle SleeveSleeve Covering Vacuum Shut-off
Flow Meter not in Calibration
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Healy System Testing
Booted Nozzle SystemsPressure Decay of TankBooted Nozzle TestVacuum Decay of Vapor Return
Bootless Nozzle Systems (600)Pressure Decay of TankVacuum Decay of Vapor ReturnA/L or V/L Nozzle Test
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Healy System Testing Problems
Wrong Testing Gauges
Incorrect Pump Piping
Different Booted Nozzle Test
Different Vacuum Decay Calculation Between Booted and Bootless Systems
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Most Commonly Found Test Problems
Loose Fittings
Traps in Vapor Return Piping
Missing or Incorrect P/V Vent Caps
Malfunctioning Vapor Recovery Nozzle Systems
Plungers in Spill Buckets Not Sealed
New Work not Completed and Covered Over
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Additional Testing Issues
Tests Scheduled 5 Days in Advance
State Required to Inspect Test
Test Results to be Supplied to State
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Safety Issues
Caution With VaporsFire Hazards
Asphyxiation
Use Cones and Safety Tape
Ladder Use During P/V Vent Cap Removal/Installation
Safety Glasses During Testing
Cold & Hot Weather Extremes
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Recommended VaporRecovery Reference
MaterialsCARB Executive Orders/Manual
PEI RP300-93 Recommended Practices for Installation and Testing of Vapor Recovery Systems
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Air Pollution Overview
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There's GOOD Ozone and BAD Ozone
THE GOOD OZONE: In the Stratosphere, ozone
protects us from the sun's harmful ultraviolet radiation.
THE BAD OZONE:In the troposphere, ozone (ground-level) can damage
lung tissue and plants.
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STRATOSPHERIC OZONE:
Occurs Naturally
Protects the Earth from Harmful Ultraviolet
Radiation
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TROPOSPHERIC OZONE:
Results from Human Activities
Causes Damage to Lung Tissue and Plants
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What is SMOG?
Volatile Organic Compounds
(VOCs)
(or Hydrocarbons)
+Nitrogen Oxides
(NOx)
+
Ground-level Ozone:
A Noxious Pollutant
Carbon Monoxide (CO):
A Poisonous Gas
(Heat and Sunlight)
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NH'S STRATEGIES TO
CONTROL OZONE
Industrial NOx and VOC controls
New Motor Vehicle Standards
Use of Reformulated Gasoline (RFG)
Stage I and Stage II Vapor Recovery
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Unburned Gasoline VaporsProblems
Gasoline distribution for use in motor vehicles creates vapors
11 lbs VOC created per 1000 gallons of gasoline vapors
- Increases ozone & smog
Hazardous Air Pollutants found in unburned gasolinevapors
- Benzene - Toluene - Hexane - Naphthene - MTBE