Atlanta Pipefitter Practice Exam 2025 – The Complete All-in-One Guide to Master Your Certification!

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What does the abbreviation CL mean in plumbing and piping?

Center Line

The abbreviation CL in plumbing and piping stands for Center Line. This term is commonly used in technical drawings and specifications to denote the central axis of a pipe, duct, or other geometric element. It is critical in the layout and installation processes, as many systems are designed symmetrically around this center line, ensuring proper alignment, support, and function.

Utilizing the center line for measurement and marking helps maintain consistency during installation, which is vital for avoiding issues such as misalignment or improper fits between connected components. Understanding this concept is fundamental for anyone working in the field, as it aids in the accurate positioning of pipes and fittings during both design and real-world applications.

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Closed Loop

Compression Line

Control Valve

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