Just a mention on that -- Texas flow lines are different than Alaska an North Dakota lines. Temps are expected to drop below freezing for only a days out of the year. As such, its not required/recommended to put the costs into "low temp" lines. The problem isn't the material either -- its the water. You forget that it's not pure oil. It's WATER that's also being pulled out as well. In below freezing temps, the water crystals can freeze at the tanks and cause cracks as the ice crystals expand. N. Dakota and Alaska have special separators to ensure that the separator's don't freeze. 

The extra costs for 1-2 weeks lost lost production a year is not a cost effective scenario. You're right, you can operate in those temperatures -- but Abilene, Texas rarely goes below zero.

The average temperature for Jan in Abilene? 34 degrees. Lowest temp in recorded history in Abilene? -9 degrees.

Average temp in Jan for Bismarck, North Dakota? 2 degrees. Lowest recorded temp in history? -45 degrees.

That's a difference in climate of 30+ degrees. Texans frequently don't deal with below freezing temperatures and some years don't experience below freezing temps. Icy conditions? Normal in N. Dakota, not so much in Texas.

You're literally asking, "WHY ARE YOU NOT SPENDING EXTRA MONEY WHEN ITS MAYBE ONLY NEEDED 7-8 DAYS OF THE YEAR?!" Yes, its operating revenue, but if you micro-manage and over prepare the costs -- that's when you end up spending more than you should.

We're not in Alaska or North Dakota. We're in Texas. Two completely different climates with different operating conditions. You can't compare operating conditions in Alaska and North Dakota with Texas, because they're not the same.