What is the formula for calculating boiler horsepower?

The formula for calculating boiler horsepower is based on the amount of steam that a boiler can produce over a specified period. Specifically, one boiler horsepower is defined as the ability to produce 34.5 pounds of steam per hour at a temperature of 212°F.

In this context, the correct formula involves dividing the steaming capacity (in pounds of steam per hour) by 34.5. This accurately reflects how many boiler horsepower are represented by a given steaming capacity. For example, if a boiler produces 1000 pounds of steam per hour, dividing 1000 by 34.5 gives you approximately 29 boiler horsepower.

This method provides a direct correlation between the steam output and the equivalent horsepower, allowing engineers and operators to effectively scale the performance of their boilers and ensure they meet operational demands efficiently.