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That is scary. I have a set of pictures of the MTA cylinder failure (type 4 EDO) in the '90s. The picture on the web site look just like the MTA failure. Luckily no one was hurt in the LAMTA incidents, the vehicle as being fueled.
There is a reason for cylinder inspection. I'm waiting to here the rest of the story.
A dollar says it's a damaged tank compounded by sub standard inspection practices. As you mentioned, John, strange timing that it happened outside of a refueling cycle. It will be interesting to get the whole story once the investigation is done.
I was doing the initial first fill on a PST pre-NGV-2 cylinder back in 1992 when it split about 8 inches lengthwise right in the middle. It let go when we bumped the pressure from 2400 to 3000 psig. The sound was unreal, sort of a very loud gong followed by an incredible whistle, about 3 seconds. I was standing right next to it doing a leak check.
Not good . . . not good at all. First questions I have are:
1)how old are tanks
2)who manufactured tanks and what type
3)when was last qualified tank inspection and
4)were there contributing factors like acid drip from batteries on tank, etc ??
Need resolution on this to prevent any "taint" on cng movement in other countries.
No real news in this article about ROOT cause of exploded tanks, except that bloody dirty diesel is now being considered. My $2 bet is that they have bunch of old faulty / cheap tanks that have not been properly been removed from service. With 4,300 cng buses in service and they can somehow say that 4.7 percent have faulty tanks, what are they doing still running those outdated tanks??!!?!?!
If diesel trucks were poorly maintained and caused big fire, I doubt press would make leap to quit using diesel . . . . they'd report that those old diesel trucks were poorly maintained and were cause.
Amazing video of a a catastrophic CNG tank failure in Seoul, Korea resulting in 17 injuries to riders and pedestrians, but incredibly, no fatalities. Seoul's bus fleet is comprised of approximately 95% CNG buses and as a result of this incident the government has launched an immediate investigation into the safety of the fuel tanks.
Here's an editorial with a few more details from the Korea Herald:
According to reports, the cause of the explosion is believed to be a fuel tank leak. The bus, powered by compressed natural gas, had eight gas containers installed at its bottom.
What made commuters angry was the admission by officials of the Ministry of Knowledge Economy on Wednesday that they had conducted a safety check on CNG-powered vehicles earlier this year and found defects in the gas containers attached to some of them.
According to the ministry, its officials tested a total of 4,300 CNG transit buses registered between 2005 and 2006 at the time. It excluded older models manufactured before 2005 from inspection because their fuel tanks had already been replaced with new ones. This suggests their inspection was perfunctory because the bus that exploded was manufactured in 2001.
Furthermore, even though the ministry officials were aware of the critical faults in some of the CNG fuel tanks, they did not bother to take preventive measures, including the establishment of tough guidelines on checking the containers. Their failure to take action cannot be explained by other reasons than their lack of concern about safety.
According to reports, about 95 percent of the 7,558 public transit buses run by the Seoul Metropolitan Government use CNG. About 120 in Seoul and 760 in other regions of the country carry the same type of fuel tank as that which exploded on Monday. Korea imported these fuel tanks from Italy between 2000 and 2001.