Instruction Manual SMC 186-188/TSMC 188

Sound data for compressor units
0170-114--EN 02.07
In the following tables the noise data of the
compressors is stated in:
-- A-weighted sound power level LW
(Sound Power Level)
-- A-weighted sound pressure level LP
(Sound Pressure level)
The values for LW constitute an average of a
large number of measurings on various units.
The measurings have been carried out in accordance
with ISO 9614-2.
The values are further stated as average
sound pressure in a free field above a reflecting
plane at a distance of 1 meter from
a fictional frame around the unit. See fig. 1.
Normally, the immediate sound pressure
lies between the LW and LP values and can
be calculated provided that the acoustic data
of the machine room is known.
For screw compressors the average values
are indicated in the tables for the following
components.
Dimension tolerances are :
1 ±3 dB for SAB, SV and FV screw compressors
±5 dB for SAB 283 L/E and SAB 355 L
screw compressors
As to the reciprocating compressors the
values are stated for the compressor block
only. The dimensional values are stated for
100% capacity.
Fig. 1.1
Fictional frame
Dimensional plane
1 meter
1 meter
Reflecting plane
0178-900-EN 17