Gas Distribution Integrity Management Program: Performance Measures
Protecting America’s Safety
Gas distribution pipeline operators are required to submit performance measure reports annually on their integrity mmanagement (IM) programs and on their pipeline infrastructure. PHMSA and State Pipeline Safety Programs use these reports, which are due on March 15 for the previous calendar year, to monitor and report on industry progress in meeting the requirements of the gas distribution IM regulations, and to respond to inquiries about both PHMSA’s and individual State’s oversight programs.
The distribution IM performance measure reports have been required since 2010, and these measures provide key information pertaining to operators’ IM programs, including the total number of leaks either eliminated or repaired by cause, the number of hazardous leaks eliminated or repaired by cause, the number of excavation damages, the number of excavation tickets (based on One-Call notifications), the total number of Emergency Flow Valves (EFV's) installed on residential services, and the estimated number of EFV's existing in distribution systems at the end of the year.
You can see progress being made under the distribution IM regulations - for the entire nation, one of PHMSA’s OPS (Office of Pipeline Safety) regions or an individual state - at the links below. Important definitions are included at the bottom of this page.
Leaks/Incidents shows the new Distribution IM data collected beginning in 2010 along with the historical leak data collected since 2005. The historical data consists of the total number of leaks which were repaired or otherwise eliminated, whereas the new Distribution IM data being collected includes this same leak count while also breaking out separately those leaks defined as hazardous. Additionally, beginning in 2010, data pertaining to Excavation Damage and Emergency Flow Valves (EFV's) is also being collected. Gas distribution incidents by-year and by-cause since 2005 are also shown. Incident causes are grouped as follows:
Mechanical Fitting Failures shows data from gas distribution operators for failures of mechanical fittings. Data collected includes the failure cause, the location of the fitting in the pipeline system, the general type of fitting involved, and the specific type of fitting involved. Since data collection began in 2011, mechanical fittings have been involved in about 5.5% of the hazardous leaks eliminated or repaired. See Mechanical Fitting Failure Reports available to the public. PHMSA performs analysis of the submitted MFFR data annually, and the current Data Analysis Procedure/Report is available to the public.
Gas Distribution Pipeline Materials shows the various pipe materials used in gas distribution systems. For each State, you can see the amount and percentage of gas distribution mains installed before 1960. The pipe material and pre-1960 mileage can be viewed for any year from 2010 forward. For additional information about aging pipeline infrastructure, see PHMSA’s Pipeline Replacement Updates website.
EFV – An Excess Flow Valve (EFV) is a self-actuating valve that automatically closes when gas flow exceeds a predetermined rate..
Excavation Damages per 1000 Excavation Tickets – For the purposes of this IM performance measure, “excavation damage” does not necessarily need to result in a release of gas, and includes any impact that results in the need to repair or replace an underground facility due to a weakening, or the partial or complete destruction, of the facility, including, but not limited to, the protective coating, lateral support, cathodic protection or the housing for the line, device, or facility.
Excavation Ticket – Receipt of information by the Gas Distribution operator from the One-Call Center indicating planned excavation by third parties for which marking of buried pipelines by the operator may be required.
Hazardous Leak – A leak that represents an existing or probable hazard to persons or property and requires immediate repair or continuous action until the conditions are no longer hazardous.
Incident - An Incident involves a release of gas from a pipeline and:
Leak - An unintentional escape of gas from the pipeline. A non-hazardous release that can be eliminated by lubrication, adjustment, or tightening, is not a leak.
Mechanical Fitting – A mechanical device used to connect sections of pipe. The term “Mechanical Fitting” applies only to: a) Stab Type fittings; b) Nut Follower Type fittings; c) Bolted Type fittings; or, d) Other Compression Type fittings.