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Columbia Gas accident report

2018-12-04 20:19:12.569981+00 by Dan Lyke 0 comments

NTSB: Preliminary Report Pipeline: Over-pressure of a Columbia Gas of Massachusetts Low-pressure Natural Gas Distribution System

Construction decoupled the sensors from the pressure control, as the segment with the sensors dropped pressure, the control systems kept trying to raise the pressure.

But this does raise some questions I've got about how my neighborhood gas distribution works, because:

Title 49 Code of Federal Regulations (CFR) 192.3 defines a low-pressure distribution system as “a distribution system in which the gas pressure in the main is substantially the same as the pressure provided to the customer.”

but when I ran the line for the pool heater, the tables told me I had to run something that was like twice the size (thus 4x the volume) of the feed line pre-regulator for the entire house, so I assume that the gas pressure to my house is actually substantially higher than what I get post-meter... Hmmm.

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