this is the 26 x 72 foot (8 x 22m) crater resulting from the gas pipeline explosion in San Bruno in 2010. the NTSB report is quite fascinating! ntsb.gov/investigations… 
the explosion blew a 1.5 ton (1360kg) section of pipe 100 feet (30m) away!
*sigh* UX problems. when the data source went away, the SCADA consoles displayed the last valid reading. 🤦♂️
the pipeline was rated at 375 psig. these analog failsafes had a slow response time and allowed the pressure to peak at 396 psig! normally with a safety factor you're OK, however...
😵
good thing the fire department has a station just down the street!
this is what they saw. 🤯
looks like the PG&E first responders found out about it by watching the news. crazy. just crazy.
W. T. F.
the story of mechanic 1 and mechanic 2, and their six (6!) supervisors!
finally supervisor 6 calls and has the gas shut off. only took an hour and a half! 🤦♂️
this table makes me sad.
pic showing the damaged houses.
too expensive to repair, so PG&E just decommissioned the pipeline.
i feel bad for the Milpitas technician.
not a good day for anyone involved, but at least they were all sober.
looks like all the SCADA operators had been on duty for at least 12 hours at the time of the accident.
the weld seam (longitudinal, aka along the length of the pipe)
what it should have looked like
stress contours!
huh, so only 4-5 people monitor all natural gas distribution to northern california. think how much money they're saving!
hey, people are expensive! they saved like $50k/yr doing this.
this is terrifying
lol
wat
cause: really bad welds. the pressures (including the accidental overpressure) were well within spec, but the pipeline itself was very poorly built.
