What is the maximum distance that 1 1/4 inch copper tubing should be supported?

What is the maximum distance that 1 1/4 inch copper tubing should be supported?

• A. 6 ft
• B. 4 ft
• C. 8 ft
• D. 10 ft

Answer: (A)

Spacing copper tubing so it doesn’t sag or put stress on joints is the concept being tested. For horizontal runs, a standard rule is to support the tube at intervals that won’t allow noticeable deflection under its own weight, plus any weight from fluid and thermal expansion. This is why a common practice sets the maximum distance between supports at six feet, even for a larger 1 1/4 inch diameter. Keeping supports no more than six feet apart helps maintain alignment, reduces movement at fittings, and minimizes vibration effects. Installations should also have supports placed within a short distance of ends or turns and use proper clamps to avoid denting. Distances longer than six feet would exceed typical code guidance and increase the risk of sag or joint stress, while shorter spacings are acceptable but not required by this maximum rule.

Spacing copper tubing so it doesn’t sag or put stress on joints is the concept being tested. For horizontal runs, a standard rule is to support the tube at intervals that won’t allow noticeable deflection under its own weight, plus any weight from fluid and thermal expansion. This is why a common practice sets the maximum distance between supports at six feet, even for a larger 1 1/4 inch diameter. Keeping supports no more than six feet apart helps maintain alignment, reduces movement at fittings, and minimizes vibration effects. Installations should also have supports placed within a short distance of ends or turns and use proper clamps to avoid denting. Distances longer than six feet would exceed typical code guidance and increase the risk of sag or joint stress, while shorter spacings are acceptable but not required by this maximum rule.