Transcript The City of Mesa EFV Program

The City of Mesa EFV Program
Anthony Cadorin
Gas Planning Engineer
City of Mesa Natural Gas Division
Mesa, Arizona
CNG Truck Driver
Program

Began installing EFVs January 1, 2008

7/17/2008 – Over 1200 installed
Where EFVs are Installed
All New Single Family Residential Homes
 At the tap wherever possible

– Stubs installed before January 1, 2008 use a
mechanical coupling at the property line

Any maintenance/renewal work at the
property line or 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 Installed






Branch services
Multi-meter services
Non-residential customers
Maintenance or renewals that don’t expose the
service at the property line or tap (I.e. riser
replacement)
Pre-determined areas with high contaminant levels
Connections to stubs that already have an EFV at
the tap
How EFVs are Installed
Majority are ½” PE fusion tapping tees with 800
series EFVs
 No additional cost incurred from the contractors

– Same amount of joints as before installing EFVs

Move away from “side saddle” aka “service
saddle” or “branch saddle”
– Shavings
Sizing
250 Class Service
Meters
400 Class Service
Meters
800 Class and 1000
Class Service
Meters
½”
CTS
600 Series
75 feet max.
length
800 Series
45 feet max. length
Not an option
½”
IPS
800 Series
300 feet max.
length
800 Series
300 feet max.
length
1800 Series
70 feet max. length
1”
IPS
1800 Series
750 feet max.
length
1800 Series
750 feet max.
length
1800 Series
750 feet max.
length
Purging and Testing
City of Mesa does not test the EFVs
 Purging – “purge at a slow flow to avoid
tripping the EFV”

– Hands on training module to practice this

When the EFVs do trip, they are very quick
to reset!
Trivia

How many gas guys does it take to replace a
light bulb?

2! One to remove the electrical outlet and
one to pipe in the gas lamp
Obstacles for the City of Mesa
EFV
Training
“All truth passes through three stages:
First, it is ridiculed; Second, it is violently
opposed; and Third, it is accepted as selfevident.”
- Arthur Schopenhauer
Dirt & Debris

Clear out the mains whenever possible

Seal off the end of the pipes when installing
the service line

Extra care to remove shavings
Cleaning Up “Dirty” Line Hits
Test services to find the low point of the
stretch of pipe
 Dig up and purge all of it out of main
 Visual inspection with camera truck
 Flush it out with water
 Dry with compressed air
 ~1 Day

Sleeving Standards

Previously used 1-1/4” sleeving

If the appliance load or service length
dictates a 1” service line, sleeving must be
excavated

Now using 2” sleeving
Mixed Size Services
½” Stub
1800 Series
EFV
1” Service
Line
Completion
11C Gas
Meter
“False-dead” Services
3rd Party Digs into a service stub no
blowing gas
 Assumes dead line

– Maintaining level of 3rd party awareness efforts
– Leak survey sites before homes are installed
Questions?

[email protected]

(480) 644-4851