Which statement about metal piping is true?

Which statement about metal piping is true?

• A. Only internal temperatures affect piping
• B. Only external temperatures affect piping
• C. Both internal and external temperatures affect piping
• D. Neither affects piping

Answer: (C)

Metal piping responds to temperature changes from both the fluid inside and the environment around it. When the pipe or the fluid inside it heats up, the metal expands; when it cools, the metal contracts. The amount of this expansion or contraction depends on the metal’s properties and how big the temperature change is. The temperature inside the pipe affects its length, alignment, and the stresses at joints and supports, so expansion joints, flexible connections, and proper anchoring are often needed. At the same time, external temperatures influence the pipe through heat gained or lost to the surrounding environment. Ambient conditions, solar exposure, insulation quality, and wind all affect the outside temperature of the pipe and can cause differential movement between sections, supports, and attached equipment. If external effects aren’t considered, you can get misalignment, excessive stresses, or insulation performance problems. Because both internal and external temperatures drive these changes, the statement that both affect piping is the best choice.

Metal piping responds to temperature changes from both the fluid inside and the environment around it. When the pipe or the fluid inside it heats up, the metal expands; when it cools, the metal contracts. The amount of this expansion or contraction depends on the metal’s properties and how big the temperature change is. The temperature inside the pipe affects its length, alignment, and the stresses at joints and supports, so expansion joints, flexible connections, and proper anchoring are often needed.

At the same time, external temperatures influence the pipe through heat gained or lost to the surrounding environment. Ambient conditions, solar exposure, insulation quality, and wind all affect the outside temperature of the pipe and can cause differential movement between sections, supports, and attached equipment. If external effects aren’t considered, you can get misalignment, excessive stresses, or insulation performance problems.

Because both internal and external temperatures drive these changes, the statement that both affect piping is the best choice.