Source: Portland Press herald
Terrible tragedies occur daily in certain regions. In other regions, the frequency may be less so. For the case of an explosion due to a natural gas leak, the frequency is small at the moment. That frequency could be changing over the course of a decade due to badly aging pipeline (infrastructure) in Boston. Recently, there was an explosion which destroyed 39 homes in a fire which started as a leak from a natural gas source. In the blog post below, the terrible event is cast into light for the reader to understand the extent of possible future damage that lies beneath the ground.
Aging Pipeline?
According to a news article in 'USA Today' titled "Natural gas explosions: Boston-area gas pipes among oldest and leakiest in US" a natural gas explosion was caused by aging pipes which are abundant in various cities across the United States:
The Merrimack Valley, the area north of Boston that was shaken by dozens of natural gas explosions Thursday, is served by some of the nation's oldest and most leak-prone pipes.Investigators have yet to determine what caused the gas explosions that burned at least 39 homes in the towns of Lawrence, Andover and North Andover. But the gas utility that serves the area has more miles of old, cast-iron gas mains than all but 15 utilities in the nation, according to a USA TODAY analysis of federal safety data.
Unfortunately, according to the Pipeline and Hazardous Materials Safety Administration, the replace of the corroded/damaged iron pipes is not required by law. This is after years of the Pipeline and Hazardous Materials Safety Administration has spent years trying to convince utility companies to replace (i.e. invest) iron piping across the United States.
Currently, Boston has enough pipe which needs to be replaced to cover the ground needed to travel between Boston and Colorado. Wow! According to the article cited above:
In the Boston area, Boston Gas in the metro area and Columbia Gas in the Merrimack Valley combine to use more than 2,200 miles of old iron mains. That's more iron gas pipe than is still in use in 45 other states combined.
Of course, in the same article the limiting step (main obstacle) for the utility companies is cost. The cost to replace the aging pipe with plastic roughly is around $1 million dollars per mile. Wow! I can see how the utility companies would be resistant toward change at such a cost. In order to get a more clearer understanding of the cost of $1 million dollars per mile, lets perform a brief dimensional analysis on that figure -- 2,200 miles worth of aging piping.
If GoogleMaps is consulted by typing into the search bar "Colorado" then hitting enter, the answer is shown below:
Which shows a map of Colorado. Now, if we zoom in onto the search function within GoogleMaps on the upper left hand corner of the screen, the picture appears as follows - shown below:
The picture is difficult to resolve the box in the upper left hand corner. Although, the point is that there is a space to enter the 'starting point' (starting destination) and the ending destination is already filled with 'Colorado'. Upon entering the entry 'Boston MA' and pressing enter, the map is shown below with different routes between the two points:
If the route is 'zoomed in on' the image below is shown with the route information - i.e. time, distance - as shown below:
The total distance between Boston (MA) and Colorado is 2,086 miles. Traveling by car would take an estimated 31 hours.
What does one make of this analysis?
Especially in relation to the article above regarding old iron gas pipes which need to be replaced?
The cost of replacing a mile of old iron pipe cited above was around $1 million - does that make sense? Possibly with all of the digging and reapplication of asphalt to cover the new pipe (not to mention the cost of plastic piping). The construction costs can certainly add up over the course of any analysis. What is important here is the following:
Replacing 2,200 miles of piping is equivalent to replacing a pipe extending from Boston (MA) to Colorado.
Wow! Looking at the distance in this respect casts the project into a much different light.
What Contributes to Pipe Degradation?
Last but not least, a brief exploration (and I mean brief) into the various causes (parameters) which contribute to the degradation of iron pipes (or steel in other cities) might be useful the reader. Especially, since a few images were provided in the article cited above with text. I have taken the images and pasted them below to give a brief tour of parameters which contribute to the degradation of pipes (underground) over time.
Source: USA Today
In the image above, the points are made regarding the aging of iron pipes simply due to shifting earth -- whether caused by weather or local construction is of concern to the residents around the city. Additionally, city officials should consider the projects and weather patterns when thinking about aging pipes and a timeline to replace such pipes.
Speaking of weather, the 'joints' in between two sections of pipes used to be made out of a material which absorbed moisture since the natural gas running through the aging pipe contained moisture. Recently, the moisture has been removed. With the removal has left the interior 'joint' material to dry out and potentially form a leak as shown below:
Source: USA Today
New or replaced piping should not contain such material. Over time, steel piping came into fashion to be used over iron piping. The issue surrounding steel is that inevitably, the metal surface (exterior) will be subjected to the local elements in the underground. Such elements will promote oxidation reactions which will cause rust or corrosion and weaken pipes or form leaks as shown below:
Source: USA Today
In order to mitigate (reduce) such corrosion or rust reactions from occurring, a 'coating' was applied to the steel pipes before installation. Of course, sitting under ground which might be shifting or exposed to varying weather patterns, the 'coating' is inevitably going to react and disappear over time. Further, the older steel was not coated. Which could have other problems listed above:
Source: USA Today
Conclusion...
The terrible tragedy of last weeks explosion due to a leak in the pipes running underneath a city carrying natural gas is devastating to say the least. In fact, the only observation that is worst than the tragedy is the fact that there exists still 2,200 miles worth of remaining 'aging piping' which could give way at any time and cause another explosion. In the blog post above, I cast the large number of remaining miles of iron piping still underneath the residents of Boston in terms of a single 'one way' trip from Boston to Colorado.
One has to really stop and pause to comprehend the danger which lies beneath them -- when staring at the map in the blog post above. Just think of the time and energy costs of replacing the pipe. The replacement will not happen over night to be sure. But if nothing happens, then what remains is the potential danger of another tragedy. Hopefully, the mayor of Boston steps up and implements guidelines to replace the piping in a swift timeline. The safety of the residents (of the US) is of paramount importance to us all.
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