Strutt|Input Data|Empirical|Boiler inserts sound power levels into the active row of the worksheet. Sound power levels can be calculated using three different methods:
Input required is selection of the formula to use and the boiler power rating.
The formulas that are implemented in each of the options are:
Laymon Miller
References sound power levels, dB, (below) according to the range that the power rating falls into.
| Heating Capacity, kW | 490 - 2942 | 2943 - 19620 |
| 31.5 Hz | 99 | 102 |
| 63 Hz | 99 | 102 |
| 125 Hz | 98 | 101 |
| 250 Hz | 96 | 99 |
| 500 Hz | 93 | 96 |
| 1 kHz | 90 | 93 |
| 2 kHz | 87 | 90 |
| 4 kHz | 84 | 87 |
| 8 kHz | 81 | 84 |
Edison Electric - General Purpose Boiler
Overall radiated sound power level is given by:
`L_W = 95 + 4log_10(kW)` (dB re 10-12 W)
Edison Electric - Large Power Plant Boiler
Overall radiated sound power level is given by:
`L_W = 84 + 15log_10(MW)` (dB re 10-12 W)
The octave band levels are then calculated by subtracting the appropriate corrections (dB) listed below:
| Boiler Type | General Purpose | Large Power Plant |
| 31.5 Hz | 6 | 4 |
| 63 Hz | 6 | 5 |
| 125 Hz | 7 | 10 |
| 250 Hz | 9 | 16 |
| 500 Hz | 12 | 17 |
| 1 kHz | 15 | 19 |
| 2 kHz | 18 | 21 |
| 4 kHz | 21 | 21 |
| 8 kHz | 24 | 21 |
References: