Linde HPR-2 - Noise reduction. SPU silencer (cont.); SPU silencer function; Comparison of sound pressure levels for a HPR 75-02 pump with and without SPU; Comparison of resulting noise emission

11
Kabinengeräusch Außengeräusch
Dieseldrehzahl (typischer Betriebsbereich)
Geräusch in 2dB(A) Schritten
artblich
it S
Noise reduction. SPU silencer
Druck [bar]
bei einer Drehzahl von 2500 U/min
50 100 150 200 250
Drehzahl [U
/
min]
bei einem eriebruck von 50 ba
1000 1500 2000 2500
challruckeel in 2 chrien challruckeel in 2 chrien
mi U mi U
>> Reduction of pressure pulsations over the entire
operating range
>> Reduction of noise emission by approx. 50 %
(equals approx. 3 dB(A))
>> Reduction of volume flow fluctuations
>> No impairment of efficiency
>> Ready for use immediately, no maintenance required
>> Simple and rugged design
>> Minimum increase in weight and volume
HPR-02 with SPU
Noise Level in 2 dB(A) steps
Cabin Noise
Outside Noise
Diesel speed (typical operating range)
conventional
with SPU
at an operating pressure of 350 bar at a speed of 2500 rpm
Noise Level in 2 dB(A) steps Noise Level in 2 dB(A) steps
Speed [rpm]
Pressure [bar]
SPU silencer function
Shown in 2 dB(A) steps over a typical diesel engine operating speed range.
Comparison of resulting noise emission
Comparison of sound pressure levels for a HPR 75-02 pump with and without SPU
The following diagrams illustrate the immediate effect of pulsation level reduction via SPU on the sound pressure level and there-
fore the perceived noise emission.
with SPU
with
SPU