| A | B |
|---|
| Brazing | A method of joining metals with a nonferrous filler metal using heat above 800°F but below the melting point of the base metals being joined. Also known as hard soldering. |
| Purging | Releasing compressed gas to the atmosphere through some part or parts, such as a hose or pipeline, for the purpose of removing contaminants. |
| Annealed copper refrigeration (ACR) tubing | Copper tubing made especially for refrigeration and HVAC work. It is especially clean and is usually charged with dry nitrogen. The ends are sealed to prevent contamination. |
| Compression joint | A method of connection in which tightening of a threaded nut compresses a compression ring to seal the joint. |
| Flare fitting | A fitting in which one end of each tube to be joined is flared outward using a special tool. The flared tube ends mate with the threaded flare fitting and are secured to the fitting with flare nuts. |
| Halocarbon refrigerants | Short for halogenated hydrocarbons, a class of refrigerants that includes most of the refrigerants used in residential and small commercial air conditioning systems. |
| Inside diameter (ID) | The distance between the inner walls of a pipe. Used as the standard measure for tubing used in heating and plumbing applications. |
| Insulation | A substance that retards the flow of heat. |
| Outside diameter (OD) | The distance between the outer walls of a pipe. Used as the standard measure for ACR tubing. |
| Specifications | A document that describes the quality of the materials and work required. Specifications dictate the types of tubing, fixtures, hangers, etc., that must be used on a project. |
| Swaged joint | A method of creating a pipe joint in which the diameter of one of the pipes to be joined is expanded using a special tool. The other pipe then fits inside the swaged pipe. |
