PG&E Line 132 goes through Bernal

That PG&E gas main that exploded in San Bruno also runs through Bernal and Potrero Hill. Most residents are not aware of this. The only hint of this is the warning sign at the top of Bernal Hill, and the occasional underground survey markings on the street.


Maps from National Pipeline Mapping System Public Viewer


There are 2 different searches required SF County and San Mateo, so they’re pasted together, scales different, but you get the idea, but you can see how things connect.


There are 3 main gas lines coming into San Francisco. PG&E Pipeline 132 is one of them.




(Red lines are other liquid pipelines; mostly fuel lines for jet fuel to the airport from the tank farms we assume).







Below is a closeup of SF gas backbone lines. That one heading south on Evans is believed to have fed the old Hunter's Point power plant. You can see the feeder to the Potrero Power plant at the East end of 23rd street.


23rd and Illinois is where the PG&E gas substation is. (Next to the power substation).


Line 132 follows 280, and breaks away from it near Folsom and Alemany Blvd. It then follows Folsom up to Bernal Hill, and around the park on Bernal Heights Blvd and then to Alabama. From Alabama, it turns East on Precita, and then turns North on York, then East on 25th, crosses the freeway, and then turns North on Rhode Island, up the hill to 20th, then down 20th to Pennsylvania where it heads South until 22nd, then East to Illinois Street where it meets up with the PG&E San Francisco Terminal at 23rd and Illinois.






Here's the peninsula overview, showing the pipelines through San Mateo county.





The red dot is where the san bruno explosion happened, on PG&E’s Line 132 which runs from their Milpitas Terminal to the San Francisco Terminal at 23rd and Illinois.




According to:

http://latimesblogs.latimes.com/lanow/2010/09/utility-in-san-bruno-blast-ordered-to-inspect-gas-system.html


“The transmission line that ruptured, known as Line 132, is 51.5 miles long. It starts in Milpitas and ends in San Francisco at 23rd and Illinios streets. PG&E officials said it is inspected annually for leaks, most recently in March, and was inspected for corrosion in November.”


These line in Bernal was tested by “Cathodic Inspection” (a type of corrosion testing) in early 2009 by Mears Group, Inc, a PG&E contractor. They did this by drilling holes in the street above the gas line every 10 feet.




At this time, we do not know the results of the inspection, or the age of the gas line in San Francisco.


MSNBC reports that “The NTSB has instructed PG&E, the Pipeline and Hazardous Materials Safety Management Administration, the California Public Utilities Commission and other organizations to not entertain requests from media.”


The results from the NTSB investigation may take up to a year to be completed.


We will update this article when we have more information.


13-Sep-2010