Acoustic Online Calculations
We’ve compiled a selection of simplified calculation approaches to provide rough acoustic estimates for common questions. These calculations are intended solely for initial orientation and do not replace the detailed analysis we apply when designing our silencers.
For an advanced noise study or tailored advice, please don’t hesitate to contact us.
Sound Pressure Level Variation as a Function of Distance
dB
distance R1
distance R2
Lp2
dB
R1
R2
Lp1
? Lp2
Lp1: Measured sound pressure level at distance R1 from the source (dB)
R1: Distance from the sound source at which the measurement was taken (m, ft, etc.)
R2: Distance from the sound source at which the sound pressure level is to be calculated (m, ft, etc.)
Lp2: Calculated sound pressure level at distance R2 from the sound source (dB)
Determining the Sound Power Level
on Measured Sound Pressure
dB @ 1m
dB @ 1m
mm
Lw
dB
Lp1
Lp2
? Lw
d
Lp1: Sound pressure level located 1 m from the sound source, approximately 15° below the discharge (dB)
Lp2: Sound pressure level located 1 m from the source, approximately 15° above the discharge (dB)
d: Pipe diameter in millimeters (mm)
Lw: Calculated sound power level of the source (dB)
Determining the Sound Pressure Level
on given Sound Power Level
dB
mm
m
d
Lp
dB
? Lp
R
Lw
Lw: given Sound Power level
d: Diameter of the outlet opening (mm)
R: Distance from the sound source (m)
Lp: Calculated Sound Pressure Level of the source (dB)
Valve Noise (Internal Sound Power Level)
kg/s
bara
bara
imp | met
The internal sound power level of a valve is a measure of the acoustic energy emitted by the valve into the piping system. It is expressed in decibels dB(A) and refers to the sound transmitted inside the pipe, not to the outside environment. This value is important for the acoustic design of systems to prevent noise propagation through pipelines.
Lw
dB(A)
? Lw
Medium: Select a gas
M: Capacity (lb/h or kg/s)
P1: Pressure upstream of the valve (psia or bara)
P2: Pressure downstream of the valve (psia or bara)
Lw: Internal sound power level of the valve (dBA)