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In North America, pipe measurements are listed as the nominal pipe size (NPS). This measurement refers to the outside diameter. As an example, a 1/2-inch copper pipe has an outside diameter of 5/8 of an inch. If a hardware store lists a pipe as having a 2 NPS, it means that all the pipes with this measurement have a 2 ⅜-inch outside diameter, regardless of wall thickness and inside diameter.

Yes, you can store a propane tank, whether it is full or empty. Remember that the container is contaminated with hazardous materials once it has housed propane, but as long as it’s properly placed in a well-ventilated, temperature-controlled space, a tank is unlikely to cause issues whether it is full of propane or not. 

Even if you invested in the cost of a gas shut-off valve for your oven and other appliances, it’s a good idea to add a seismic shut-off valve as an extra safety measure. 

Gas shut-off valves for appliances are manual, meaning someone has to cut off the flow of gas. This leaves room for error, as you might not be home or might be too distracted to think about gas lines during an earthquake. An earthquake valve is automatic and will protect your home from gas-related disasters in the event of an earthquake.

Pipefitting is a more specialized profession, and pipefitters work with complex systems and low- and high-pressure pipes, so it can be considered harder than plumbing. Though each profession comes with its challenges, the nature of pipefitting requires working with heavier materials in fast-paced and dangerous environments, which can be more challenging than working on residential and commercial plumbing systems.