Pipe Fitting

“Pipe fitting” generally refers to the process of installing or repairing piping systems used for transporting fluids (liquids and gases) across residential, commercial, or industrial systems. It can also refer to the actual components used to connect pipes.

Here’s a breakdown of key aspects:

1. Pipe Fitting as a Trade
Pipefitters (or steamfitters) are skilled tradespeople who install and maintain piping systems.

Common in industries like oil and gas, chemical plants, power plants, HVAC systems, and more.

Work involves cutting, threading, welding, and assembling pipes.

2. Common Pipe Fitting Materials
Metal: Steel, stainless steel, copper, brass

Plastic: PVC, CPVC, PEX, HDPE

Other: Cast iron, fiberglass

3. Types of Pipe Fittings
Each type has a specific function in piping design:

Fitting Type Function
Elbow (90°, 45°) Changes direction of flow
Tee Splits flow into two directions
Reducer Connects pipes of different sizes
Coupling Connects two similar pipes
Union Similar to a coupling but allows disconnection
Cap/Plug Closes the end of a pipe
Nipple Short pipe piece for connections
Valve Controls the flow (e.g., ball, gate, check valves)

4. Pipe Fitting Methods
Threaded: Screw threads used (common in small pipes)

Welded: Strong and permanent (used for high-pressure systems)

Flanged: Uses bolted flanges for easy disassembly

Compression: Common in plumbing and small-diameter applications

Solvent Welded: Used with plastics like PVC

5. Pipe Sizing Standards
Nominal Pipe Size (NPS – U.S. standard)

DN (Diameter Nominal – metric)

Schedule (e.g., SCH 40, SCH 80) determines wall thickness

6. Safety and Codes
Fittings must meet plumbing/building codes (e.g., ASME, ASTM, ISO)

Safety gear is crucial: gloves, eye protection, etc.