How are pipe fittings classified?

• A. By length, width, and diameter
• B. By shape, function, and material
• C. By cost and availability
• D. By color and size

Answer: (B)

Pipe fittings are classified primarily by shape, function, and material, which is essential for determining their use in various piping systems.

Shape refers to the physical form of the fitting, such as elbows, tees, reducers, and caps. Each shape serves a specific purpose in altering the direction of flow, connecting different sections of pipe, or terminating a line.

Function pertains to the role the fitting plays within the system, such as whether it's used for branching (like a tee), changing direction (like an elbow), or reducing pipe diameter (like a reducer). Understanding the function helps in selecting the appropriate fitting for a particular application, ensuring that the piping system operates efficiently.

Material classification considers the substances from which fittings are made, such as PVC, copper, steel, or stainless steel. The choice of material affects the fitting's strength, resistance to corrosion, and suitability for various fluids and temperatures.

The other options—length, width, and diameter; cost and availability; or color and size—do not encompass the core principles of how fittings are categorized for practical application in piping systems. These factors have less relevance to the functional design and compatibility of fittings in installation and maintenance.