1. Excess Flow Valves – Implementation Challenges Bill Norton PIPES Act of 2006 PIPES Act of 2006 EFVs EFVs Anthony Cadorin City Of Mesa Sizing Procedures City Of Mesa Sizing Procedures EFV Sizing EFV Sizing

2. Excess Flow Valves Bill Norton

3. Prior Legislation RSPA Final Rule, February 3 rd 1998, Effective February 3 rd 1999 RSPA Final Rule, February 3 rd 1998, Effective February 3 rd 1999 Required either notification of availability or installation Required either notification of availability or installation

4. New Legislation Installed or replaced after June 1, 2008 Installed or replaced after June 1, 2008 Operates continuously throughout the year at a pressure not less than 10 psig Operates continuously throughout the year at a pressure not less than 10 psig Is not connected to a main with prior experience with contaminants Is not connected to a main with prior experience with contaminants Non-interference with necessary operation or maintenance activities Non-interference with necessary operation or maintenance activities Commercially available Commercially available Installation on single family residential service if:

5. New Legislation Annually reportable Annually reportable Reportable procedure has not been determined Reportable procedure has not been determined Reference to Sec.9.(3)(A-B), and (6) Reference to Sec.9.(3)(A-B), and (6) Further Considerations

6. “The Big Day” June 1, 2008 June 1, 2008 PIPES Act of 2006

7. What is an EFV? Self-actuating valve Self-actuating valve In-line mechanical device In-line mechanical device Responds to the high-pressure differential Responds to the high-pressure differential Designed to activate when a rupture occurs Designed to activate when a rupture occurs Stop or minimize the flow of gas Stop or minimize the flow of gas

8. How EFVs Function Open: Gas Flows “Unobstructed” Closed: Gas Flow Is Blocked dependent Activation is DIRECTLY dependent upon Gas Velocity

9. Types of EFVs Positive Shutoff (EFVNB) Positive Shutoff (EFVNB) –100% shut off –Manually reset Bleed-by (EFVB) Bleed-by (EFVB) –Approximately 97% shut off –Self-resetting –<20 standard cubic feet of gas per hour (Scfh) @ 10 psig

10. Sizes Typical Sizes Typical Sizes - 400 Series - 1000-1200 Series - 800 Series - 1800 Series EFVs are designated using their size EFVs are designated using their size –I.e. 400 series –At 10 psig, 400 standard cubic feet of gas per hour (Scfh) will cause the excess flow valve to trip

11. Applications Mechanical Coupling Mechanical Tapping Tee PE Stick Fusion Tapping Tee Shut Off Valve

12. Who is using EFV’s? Ohio ~450,000 Ohio ~450,000 Pennsylvania ~200,000 Pennsylvania ~200,000 Massachusetts ~176,000 Massachusetts ~176,000 Minnesota ~113,000 Minnesota ~113,000 –Mostly Northeastern states –Voluntary; not state or federally mandated

13. Questionnaire Conducted to determine industry standards Conducted to determine industry standards 14 operators surveyed across U.S. 14 operators surveyed across U.S. –Pacific Gas & Electric –NW Natural Gas –Citizens Gas & Coke –New Jersey Natural Gas –St. Lawrence Gas

14. Industry Preference PE “sticks” or In-line: 86% PE “sticks” or In-line: 86% –Ease of replacement In-line and Tapping Tees: 7% In-line and Tapping Tees: 7% Tapping Tee: 7% Tapping Tee: 7% Positive Shutoff: 29% Positive Shutoff: 29% Bleed-by: 71% Bleed-by: 71%

15. Common Basic Practices Not installed where line pressure is 10 psig or lower Not installed where line pressure is 10 psig or lower –Unrealized trip flow rate –Pressure drop may affect flow rate –Design pressure minimum

16. Common Basic Practices Not installed where a high amount of contaminants are in the line (water, dust, grease, etc.) Not installed where a high amount of contaminants are in the line (water, dust, grease, etc.) –Spring failure –False trips –Valve malfunction

17. Common Basic Practices Not installed on commercial applications Not installed on commercial applications –Transient nature of businesses –Additional load w/o notification –Breadth of capacity –Size of service line requirements

18. Common Basic Practices Not installed in emergency situations Not installed in emergency situations Not enough time to properly size the EFV which could potentially result in tripping the EFV during normal operational use

19. Surveyed Issues False Trips False Trips Line contaminants Line contaminants Improper Installation Improper Installation Third Party Damages Third Party Damages

20. Further Consideration Not installed on: Multi-family homes Multi-family homes Branch services Branch services Multi-metered manifolds Multi-metered manifolds

21. Challenges for Mesa O & M; Construction Practices & Emergency Plan modifications O & M; Construction Practices & Emergency Plan modifications –Pressure testing and purging procedures –EFV Sizing and installation –Bleed-by feature –Service annotation: Drawings and field Training Training Implementation Implementation

22. EFV Sizing Anthony Cadorin

23. City of Mesa sizing table 250 Class Service Meters 400 Class Service Meters 800 Class and 1000 Class Service Meters 1/2” CTS 600 Series 75 feet max. length 800 Series 45 feet max. length Not an option 1/2” 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

24. Why a sizing table? Meter size provides an upper limit on the amount of gas that a line will flow Meter size provides an upper limit on the amount of gas that a line will flow Line size (diameter) sets up the maximum length that a given EFV will protect Line size (diameter) sets up the maximum length that a given EFV will protect

25. Creating a sizing table for Gas City Not an option Δ 250 Class Service Meters 400 Class Service Meters 800 Class and 1000 Class Service Meters 1/2” CTS 3/4” IPS 1” IPS

26. Creating a sizing table for Gas City EFVs must be sized at the lowest predicted operating pressure EFVs must be sized at the lowest predicted operating pressure –Gas City: 10 psig Maximum load is determined by the meter Maximum load is determined by the meter – 400 Scfh per meter manufacturer Go to EFV manufacturer’s flow rates for trip points Go to EFV manufacturer’s flow rates for trip points

27. Creating a sizing table for Gas City Minimum system pressure: 10 psig This EFV will work EFV Inc. 400 Series EFV

28. Creating a sizing table for Gas City Maximum service length protected: Maximum service length protected: Gas City lowest predicted operating pressure: 10 psigGas City lowest predicted operating pressure: 10 psig EFV Inc. 400 Series EFV maximum trip point @ 10 psig: 615 ScfhEFV Inc. 400 Series EFV maximum trip point @ 10 psig: 615 Scfh Pressure drop across EFV: 0.66 psig per manufacturer (include in ΔP calculationPressure drop across EFV: 0.66 psig per manufacturer (include in ΔP calculation Use the “IGT improved” flow equation and solve for length “L”:Use the “IGT improved” flow equation and solve for length “L”:

29. Creating a sizing table for Gas City Not an option 250 Class Service Meters 400 Class Service Meters 800 Class and 1000 Class Service Meters 1/2” CTS EFV Inc. 400 Series 300 feet max. length 3/4” IPS 1” IPS

30. Creating a sizing table for Gas City EFV ½” CTS 400 Series 300 ft. Maximum Length ¾” IPS800 Series 300 ft Maximum Length 1” IPS 1800 Series 750 feet max. length

31. Typical Appliance Loads 224 Scfh: 250 Class Meter 624 Scfh! New meter required!

32. Questions?