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LARGE EFV APPLICATIONS STUDY

LARGE EFV APPLICATIONS STUDY. Mike Israni Senior Technical Advisor Manager: National Standards July 30, 2009. NTSB RECOMMENDATION P-01-2. NTSB issued P-01-2 on June 22, 2001 PHMSA should require operators to install EFVs on all new and replacement service lines

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LARGE EFV APPLICATIONS STUDY

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  1. LARGE EFV APPLICATIONS STUDY Mike Israni Senior Technical Advisor Manager: National Standards July 30, 2009

  2. NTSB RECOMMENDATION P-01-2 • 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. PIPES ACT OF 2006 • 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

  4. EFV TEAMOrganizations Represented • »Regulators • PHMSA, OPS • NTSB • States, NAPSR • » Fire Services »Public »EFV Manufacturers »Distribution Operators AGA APGA

  5. ACTION PLAN • 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

  6. INCIDENT DATA1984 - Jan 2009 1557 960 870

  7. NRRIEFV SURVEY DATAMarch 2007 • 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. JUNE 23rd MEETING SUMMARY • 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

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