For steel pipe sizes less than 8 inches using threaded fittings, what minimum wall thickness is required?

For steel pipe sizes less than 8 inches using threaded fittings, what minimum wall thickness is required?

• A. Schedule 40
• B. Schedule 80
• C. Schedule 10
• D. Schedule 20

Answer: (A)

The test is about selecting the appropriate pipe wall thickness for standpipes with threaded joints. For steel pipe sizes under 8 inches that use threaded fittings, the minimum wall thickness specified is Schedule 40. This thickness provides sufficient strength and pressure resistance for threaded connections without the extra weight and cost of thicker schedules. Thinner schedules (like 10 or 20) would be more prone to leakage or failure at the threads, while thicker schedules (like 80) aren’t required for this service and add unnecessary weight and cost.

The test is about selecting the appropriate pipe wall thickness for standpipes with threaded joints. For steel pipe sizes under 8 inches that use threaded fittings, the minimum wall thickness specified is Schedule 40. This thickness provides sufficient strength and pressure resistance for threaded connections without the extra weight and cost of thicker schedules. Thinner schedules (like 10 or 20) would be more prone to leakage or failure at the threads, while thicker schedules (like 80) aren’t required for this service and add unnecessary weight and cost.