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Program Began installing EFVs January 1, 2008 Began installing EFVs January 1, /17/2008 – Over 1200 installed 7/17/2008 – Over 1200 installed
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The City of Mesa EFV ProgramThe City of Mesa EFV Program
Anthony CadorinAnthony CadorinGas Planning EngineerGas Planning Engineer
City of Mesa Natural Gas DivisionCity of Mesa Natural Gas DivisionMesa, ArizonaMesa, Arizona
CNG Truck DriverCNG Truck Driver
ProgramProgram
Began installing EFVs January 1, 2008Began installing EFVs January 1, 2008
7/17/2008 – Over 1200 installed7/17/2008 – Over 1200 installed
Where EFVs are InstalledWhere EFVs are Installed
All New Single Family Residential HomesAll New Single Family Residential Homes At the tap wherever possibleAt the tap wherever possible
– Stubs installed before January 1, 2008 use a Stubs installed before January 1, 2008 use a mechanical coupling at the property linemechanical coupling at the property line
Any maintenance/renewal work at the Any maintenance/renewal work at the property line or at the tapproperty line or at the tap
Why at the tap?Why at the tap?
70 Total damages to service lines in 2006
52 Resulted in blowing gas
13 Damages in the street
11 Damages to new construction
2 Damages to lines with existing houses
25% of service line damages would not be protected by the EFV with it at the property line/back of curb
Where EFVs are NOT InstalledWhere EFVs are NOT Installed
Branch servicesBranch services Multi-meter servicesMulti-meter services Non-residential customersNon-residential customers Maintenance or renewals that don’t expose the Maintenance or renewals that don’t expose the
service at the property line or tap (I.e. riser service at the property line or tap (I.e. riser replacement)replacement)
Pre-determined areas with high contaminant levelsPre-determined areas with high contaminant levels Connections to stubs that already have an EFV at Connections to stubs that already have an EFV at
the tapthe tap
How EFVs are InstalledHow EFVs are Installed Majority are ½” PE fusion tapping tees with 800 Majority are ½” PE fusion tapping tees with 800
series EFVsseries EFVs No additional cost incurred from the contractorsNo additional cost incurred from the contractors
– Same amount of joints as before installing EFVsSame amount of joints as before installing EFVs Move away from “side saddle” aka “service Move away from “side saddle” aka “service
saddle” or “branch saddle” saddle” or “branch saddle” – ShavingsShavings
SizingSizing
250 Class Service Meters
400 Class Service Meters
800 Class and 1000 Class Service
Meters
½” CTS
600 Series75 feet max.
length
800 Series45 feet max. length Not an option
½” IPS
800 Series300 feet max.
length
800 Series300 feet max.
length
1800 Series70 feet max. length
1” IPS
1800 Series750 feet max.
length
1800 Series750 feet max.
length
1800 Series750 feet max.
length
Purging and TestingPurging and Testing
City of Mesa does not test the EFVsCity of Mesa does not test the EFVs Purging – “purge at a slow flow to avoid Purging – “purge at a slow flow to avoid
tripping the EFV”tripping the EFV”– Hands on training module to practice thisHands on training module to practice this
When the EFVs do trip, they are very quick When the EFVs do trip, they are very quick to reset!to reset!
TriviaTrivia
How many gas guys does it take to replace How many gas guys does it take to replace a light bulb?a light bulb?
2! One to remove the electrical outlet and 2! One to remove the electrical outlet and one to pipe in the gas lampone to pipe in the gas lamp
Obstacles for the City of MesaObstacles for the City of Mesa
EFV
TrainingTraining
““All truth passes through three stages: All truth passes through three stages: First, it is ridiculed; Second, it is violently First, it is ridiculed; Second, it is violently opposed; and Third, it is accepted as self-opposed; and Third, it is accepted as self-evident.”evident.”
- Arthur Schopenhauer- Arthur Schopenhauer
Dirt & DebrisDirt & Debris
Clear out the mains whenever possibleClear out the mains whenever possible
Seal off the end of the pipes when installing Seal off the end of the pipes when installing the service linethe service line
Extra care to remove shavingsExtra care to remove shavings
Cleaning Up “Dirty” Line HitsCleaning Up “Dirty” Line Hits
Test services to find the low point of the Test services to find the low point of the stretch of pipestretch of pipe
Dig up and purge all of it out of mainDig up and purge all of it out of main Visual inspection with camera truckVisual inspection with camera truck Flush it out with waterFlush it out with water Dry with compressed airDry with compressed air ~1 Day~1 Day
Sleeving StandardsSleeving Standards
Previously used 1-1/4” sleevingPreviously used 1-1/4” sleeving
If the appliance load or service length If the appliance load or service length dictates a 1” service line, sleeving must be dictates a 1” service line, sleeving must be excavatedexcavated
Now using 2” sleevingNow using 2” sleeving
Mixed Size ServicesMixed Size Services
1” Service Line
Completion
½” Stub
1800 Series EFV
““False-dead” ServicesFalse-dead” Services
33rdrd Party Digs into a service stub no blowing Party Digs into a service stub no blowing gasgas
Assumes dead lineAssumes dead line
– Maintaining level of 3Maintaining level of 3rdrd party awareness efforts party awareness efforts– Leak survey sites before homes are installedLeak survey sites before homes are installed
