Which of the following are used to prevent tubes from sagging because of weight?

• A. Baffles
• B. Brackets
• C. Hangers
• D. Supports

Answer: (A)

Keeping tubes from sagging under their own weight relies on proper support along the length of the run. Hangers are the fittings that attach to the framing and carry the tube weight at regular intervals, holding the tubes in the correct position and allowing for thermal expansion and contraction. This mid-span support distributes the load and prevents downward bending as the tube length bears weight. Brackets and generic supports can serve specific mounting needs, but they don’t provide the continuous, load-bearing support along the tube that prevents sagging. Baffles are flow-directing plates inside vessels or ducts; their role is to steer flow and improve heat transfer, not to support tube weight. So the mechanism meant to stop sagging by weight is the hanger.