For LP gas operating at 40000 Btu and 11 in/wc, what is the required orifice size?

To determine the required orifice size for LP gas operating at 40,000 BTU and 11 inches of water column (in/wc), you need to consider the proper calibration of the orifice diameter that allows the gas to flow efficiently while maintaining the appropriate pressure and energy output.

The orifice size is crucial because it directly affects the fuel-air mixture that reaches the burner. If the orifice is too small, the gas flow will be restricted, potentially resulting in insufficient heat output. Conversely, if it's too large, the mixture can become too rich, which could lead to incomplete combustion.

In this case, with an input requirement of 40,000 BTU and a pressure of 11 in/wc, the industry standard references determine that a #50 orifice is appropriate for LP (liquefied petroleum) gas at this BTU level. This has been established through empirical testing and calculation, ensuring that it will deliver the desired heating value effectively under the specified pressure conditions.

Thus, choosing a #50 orifice ensures that the burner receives the correct volume of gas for optimal performance, facilitating an efficient combustion process that maximizes heating while minimizing waste.