What is the most length of pipe needed for a natural gas system using a 1/2-inch schedule 40 iron pipe carrying 120 cubic feet per hour?

To determine the maximum length of pipe needed for a natural gas system using a 1/2-inch schedule 40 iron pipe carrying 120 cubic feet per hour, one must consider the capacity and pressure drop characteristics of the pipe.

In natural gas applications, the length of the pipe is critical because it affects the pressure drop across the system. Each diameter of pipe has a specific capability for gas flow. For a 1/2-inch pipe, there are established guidelines that define the maximum length allowed based on flow rates, allowing for efficient gas delivery without significant pressure losses.

When carrying 120 cubic feet per hour, a properly referenced chart indicates that this flow rate can be supported over a certain length of a 1/2-inch diameter schedule 40 iron pipe. Referencing these charts, it becomes evident that 10 feet is a common maximum length before pressure drops become significant, making that length ideal for operational efficiency and safety.

Therefore, the most appropriate length of pipe, considering standard practice in natural gas systems and the flow rate specified, is 10 feet.