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Mass gas

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ghrit

  • 3416
  • Member since October 05, 2008
Mass gas
« on: September 14, 2018, 03:13:40 PM »
New York is as close as I could find in the forum to New England, so here ya go--

If we thought there would be a problem getting gas to Massachusetts, there may now be a problem getting more in use.  Commonwealth Gas has apparently dumped in it's breakfast bowl.
https://www.bostonglobe.com/
I have asked my contacts for backup info.  One of them is a retired HVAC guy that has dealt with CG his entire working life.  The other is an evacuee.

Knowing how old some of CG's pipe is, this does not surprise me at all.  Moreover, I'm suspicious of a reducing valve failure allowing the mains to over pressurize.  Dunno.  Yet.
« Last Edit: September 14, 2018, 03:17:19 PM by ghrit »
There are two kinds of ships.  Submarines and targets.
www.survivalmonkey.com

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aktony

  • 1156
Re: Mass gas
« Reply #1 on: September 14, 2018, 05:52:42 PM »
Thanks for your post.  The MA situation has frightened many on the east coast, i.e., NY and NJ.

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Wax

  • 6370
Re: Mass gas
« Reply #2 on: September 14, 2018, 11:06:11 PM »
They were in the process, of updating gas lines to many customers.  More than 70 fires and the smell of gas outside. Thousands cannot go home. Nightmare situation. Three stages of gas lines, High <1500 psig, medium <200 psig, low <10 psig. All regulators have a maximum input rating. The max regulator on high pressure gas must have failed, and caused a bunch of regulators downstream to get very high pressure gas causing them to fail. That would change a pilot lite, into a flame thrower.  That's my guess. Hope for a bad situation, to get better very soon.   


https://www.cnn.com/2018/09/14/us/massachusetts-explosions-fires/index.html

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ghrit

  • 3416
  • Member since October 05, 2008
Re: Mass gas
« Reply #3 on: September 14, 2018, 11:27:32 PM »
They were in the process, of updating gas lines to many customers.
They had not yet started the upgrade, but it was definitely planned and supposedly funded.  I get this from my shipmate in Andover.

Your guess about failed regulators is as close as any at this stage.  The Columbia operation has been taken out of the loop, Eversource is now in charge.
https://www.bostonglobe.com/metro/2018/09/14/outrage-mounts-questions-about-cause-gas-explosions-unanswered/9inzfjJ72YYOCIH6CakaPP/story.html
There are two kinds of ships.  Submarines and targets.
www.survivalmonkey.com

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Wax

  • 6370
Re: Mass gas
« Reply #4 on: September 15, 2018, 10:03:13 AM »
They were in the process, of updating gas lines to many customers.  More than 70 fires and the smell of gas outside. Thousands cannot go home. Nightmare situation. Three stages of gas lines, High <1500 psig, medium <200 psig, low <10 psig. All regulators have a maximum input rating. The max regulator on high pressure gas must have failed, and caused a bunch of regulators downstream to get very high pressure gas causing them to fail. That would change a pilot lite, into a flame thrower.  That's my guess. Hope for a bad situation, to get better very soon.   


https://www.cnn.com/2018/09/14/us/massachusetts-explosions-fires/index.html
High Pressure Blow-off valve failed and what I wrote above followed. Its what is being said today.
But until further inspection they will not know. If the high pressure regulator failed, the results would be the same.
So much for a computerized watchdog, computer site. According to designers of pipelines this situation cannot happen and is "fail safe". I guess the central monitoring station operator was taking a break. Similar to the train going 90-mph on a 25-mph curve, and the engineer was at the helm. (sleeping or texting) 

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aktony

  • 1156
Re: Mass gas
« Reply #5 on: September 15, 2018, 11:11:41 AM »

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claude

  • 159
What Newsweek had to say
« Reply #6 on: September 15, 2018, 12:51:53 PM »
Not much info on the actual cause. will have to wait for official investigation.

https://www.newsweek.com/video-what-caused-boston-gas-line-blasts-1121068
The Federal Government, MS state government, FERC, Courts, and gas and pipeline companies have stolen my underground caverns.

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aktony

  • 1156
Re: Mass gas
« Reply #7 on: September 16, 2018, 09:17:34 PM »
Pressure in Pipes Caused Gas Explosion Brief article.  Full article in WSJ behind pay wall.

https://www.marketwatch.com/story/overpressure-in-pipes-caused-massachusetts-gas-explosions-2018-09-16

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Wax

  • 6370
Re: Mass gas
« Reply #8 on: September 17, 2018, 12:03:33 PM »
Thanks Aktony.  I would hope every pipe connected to the system will be pressure tested (or was) before put back into service. Outdoor leaks have a nasty habit of following the outside of a pipe into a home.

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aktony

  • 1156
Re: Mass gas
« Reply #9 on: September 18, 2018, 12:50:06 PM »

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Wax

  • 6370
Re: Mass gas
« Reply #10 on: September 18, 2018, 11:30:38 PM »
This is from what Aktony posted
"The federal Pipeline and Hazardous Materials Safety Administration has reported that the pressure in the Columbia Gas system should have been around 0.5 pounds per square inch (PSI), but readings in the area reached at least 6 PSI twelve times higher than the system was intended to hold," the letter said

I have worked on a lot of gas regulators, and baffled by the explanation. At the college facility I worked, all the outdoor regulators next to the meter could reduce 20 psig  to  4.5 to 7.5 inches on a water column . I would imagine homes work the same. The outdoor regulator is equipped  with a blow off outside if the inlet pressure exceeds the regulator inlet rating.  The numbers do not add up, for me, anyway. Has to be more to the story.