What is the required support interval for SDR 40 PVC pipe?

What is the required support interval for SDR 40 PVC pipe?

• A. 2 ft
• B. 4 ft
• C. 6 ft
• D. 8 ft

Answer: (B)

Proper support spacing keeps PVC drainage pipe aligned and protects joints from stress. For SDR 40 PVC pipe, the standard practice is to support horizontal runs at four-foot intervals. This spacing matches the pipe’s stiffness and the loads it carries, helping prevent sag between supports and reducing the chance of joint or fitting stress as soil settles or loads change. Placing supports more often than four feet isn’t typically required and adds unnecessary fittings and labor, while spacing them farther apart increases the risk of deflection between supports. So four feet is the recommended interval for SDR 40 PVC.

Proper support spacing keeps PVC drainage pipe aligned and protects joints from stress. For SDR 40 PVC pipe, the standard practice is to support horizontal runs at four-foot intervals. This spacing matches the pipe’s stiffness and the loads it carries, helping prevent sag between supports and reducing the chance of joint or fitting stress as soil settles or loads change.

Placing supports more often than four feet isn’t typically required and adds unnecessary fittings and labor, while spacing them farther apart increases the risk of deflection between supports. So four feet is the recommended interval for SDR 40 PVC.