Prof. Howard Weiss shares his insights with our readers monthly.
Natural Gas is a resource with several uses and, in fact, almost 50% of U.S. homes use it for heating. This figure shows the supply chain for natural gas.
Resource location Natural gas is extracted from rock formations, wells and coalbeds.
Pareto Principle Natural gas is produced in varying amounts in 95 countries. The U.S., Russia, Iran, and Qatar produce half of the natural gas worldwide. Five states, Texas, Pennsylvania, Louisiana, W. Virginia and New Mexico, produce over 60% of the total natural gas in the US. Thus, both U.S. and worldwide production follow the Pareto principle as explained in the quality chapter (Ch. 6).
Transportation The supply chain chapter (Ch.11) lists six major means of distribution – trucking, railroads, airfreight, waterways, multimodal and pipelines. Unlike oil, before natural gas is processed it can only be transported through pipelines.
Project Management. Building the pipeline is a project with two major parts. The pipeline company does not own the land where the pipeline is, but rather needs to get legal access to the properties. The second part is the construction of the pipeline itself. This involves digging and bending pipes to fit the planned route of the pipeline. Companies install about one mile of pipe per day. The U.S. has more than 300,000 miles of main pipelines, while Russia has more than 100,000.
Quality control After construction the pipeline is testing using water piped at a higher pressure than the gas will be transported.
Processing The gas goes to a compressor station (where impurities are removed) and then is pressurized to move it post-processing.
Post Processing Transportation The gas is then moved at 25 miles per hour through pipelines. Some gas is liquefied by chilling it to -263 degrees Fahrenheit so it can be shipped by special tanker ships and rail cars. Natural Gas is 600 times more in volume than liquefied natural gas. LNG can also be shipped to places that do not have pipelines.
Storage Currently there are 400 storage sites for natural gas in the U.S.
Classroom Discussion Questions:
1. Does your residence use natural gas? If so, what are its uses?
2. Some natural gas that is discovered is not sold but rather is burnt off at the site where it is found. Why do you think the gas is wasted rather than being sold?