Different Types of Pipelines
There is quite a bit of misinformation that gets thrown around regarding the Mariner East pipeline and the Natural Gas Liquids it will carry. It is prudent to clarify exactly what is planned and what it means for public safety.
The proposed 20 inch diameter Mariner East 2 pipeline would move as many as 450,000 barrels or 18.9 million gallons of liquefied ethane, propane, and butane per day. These gas products, artificially liquefied within the pipeline under high pressure, are commonly referred to as Natural Gas Liquids (NGLs).
There is some confusion about NGLs and how they compare to naturally liquid petroleum or the natural gas with which we are more familiar. Let's address each type