Steam piping shall be graded ______.

In steam piping systems, proper grading is essential to ensure efficient drainage and prevent water accumulation, which can lead to carryover and inefficiencies in steam delivery. The correct grading for steam piping is 1/2 inch per 20 feet. This slope helps facilitate proper drainage of condensate back to the boiler or designated drain points, supporting optimal performance and longevity of the steam system.

The chosen option promotes the correct balance of gradient, ensuring that steam flows smoothly while allowing any condensed water to exit the system effectively. A steeper or inadequately graded piping might result in trapping condensate, which could negatively affect system performance by causing water hammer or reduced steam quality. Therefore, 1/2 inch per 20 feet is recognized as a standard practice in installing steam piping systems.