1. 1 Mike Israni Senior Technical Advisor Manager: National Standards July 30, 2009

2. 2  NTSB issued P-01-2 on June 22, 2001  PHMSA should require operators to install EFVs on all new and replacement service lines  All customer classifications with suitable gas service conditions included

3. 3 Section 9 mandated that PHMSA require EFV installation on new and replacement single family residential service lines operating at ≥ 10 psig continuously throughout the year  PHMSA issued Advisory Bulletin ADB-08-04  Advised gas distribution operators that EFV mandate went into effect June 1, 2008  PHMSA issued NPRM for DIMP which proposed to:  Eliminate 49 CFR 192.383, EFV notification requirement  Require EFV for SFR Service Line (Proposed 49 CFR 192.1011 )  Require operators to report the number of EFVs installed  Retain exceptions due to operations difficulties

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5. 5  Data collection  Incidents subject to mitigation  Additional data requirements  Review recommendation with NTSB  Assessment of technical feasibility, cost, risks, safety  Share current EFV technology, availability, and cost data  Review EFV utilization: residential, commercial, industrial  Identify modifications required for EFV performance stds  Identify the effect of EFVs on operations and safety  Changing loads, snap loads, contaminants  Service line size and pressure  Compilation of findings

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7. 7  Operators reported 1,108 successful gas flow terminations in response to severe line breaks  Actuations as % of installed EFVs: 0.044%  EFVs seldom close inadvertently  False closures as % of EFVs: 0.0089%  Reliability data  2% of EFVs installed on gas lines that ruptured failed to function properly  Of the 497 respondents, 3 experienced failed closures

8. 8  EFVs available ≤ 5,500 SCFH, pressures ≤ 1000 psig  Dynamic nature of customer load changes could require either  More frequent need to replace EFVs, or  Larger service line/EFV in anticipation of future load growth  Larger lines/EFVs installed in anticipation of future load growth could result in greater consequences or failure to close when needed  DIMP rules and damage prevention requirements should reduce incidents and need for EFVs  Data on EFV use beyond SFR is very limited  Countries outside of US do not mandate use of EFVs  Existing ASTM and MSS standards are based on ensuring operability at 125 psig inlet pressure