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What size drill bit is needed to a propane orifice produce 15000 btu 11 WC?

The correct answer is #51 drill bit.

To calculate the correct drill bit size for a propane orifice to produce 15,000 BTU at 11 WC, you can use the following formula:

Orifice Diameter (inches) = √(BTU Input / (6500 × √WC))

Orifice Diameter (inches) = √(15,000 / (6500 × √11))

Orifice Diameter (inches) = 0.062 inches

To convert the orifice diameter in inches to a drill bit size, you can refer to a drill bit size chart. The closest drill bit size to 0.062 inches is a #51 drill bit.

Therefore, you will need a #51 drill bit to produce 15,000 BTU at 11 WC.