However, the specific environmental impact of each type of iron comes down to differences in processing. Cast iron, made from melting down scrap iron and other alloys, does make use of recycled materials. However, the energy-intensive process of melting and casting iron can have a significant carbon footprint. Cast iron is also more likely to need replacement if damaged, potentially resulting in more frequent material use over time.
In addition to extraction, processing, and transportation, NG equipment is also used in the storage and distribution of natural gas. Storage facilities such as underground caverns and aboveground tanks require specialized equipment to maintain the pressure and temperature needed to store the gas safely. NG equipment such as compressors, regulators, and safety valves are used to control the flow of gas in and out of storage facilities and prevent accidents or leaks.