Gas pipe leaks are more common in the U.S then we think. People are injured, property is destroyed, and sometimes even death is involved. Gas pipes can be broken during times of construction but they are also subject to corrosion and rust. Alternate materials can be used to replace the ageing pipes. These materials are more reliable and can withstand harsher environments but the cost is pricey and the installation time is lengthy.  It is critical for our safety and well-being that ageing gas pipes are NOT overlooked. Read more on this topic at: http://www.usatoday.com/longform/news/nation/2014/09/23/gas-pipes-cast-iron-deaths-explosions-investigation/15783697/