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Air Intake Silencer

When a large diesel or gas powered two/four stroke engine or turbine is used, large quantities of air are drawn into the equipment for combustion purposes. These air induction systems may be naturally aspirated or use turbo chargers or compressors to increase the air pressure fed into the fuel mixing chambers or cylinders to increase efficiency or performance.

The speed of the air entering the system can create a substantial amount of noise. In addition, the high rotating speed of the turbo charger or compressor, which is directly connected upstream in relation to the intake position, may cause noise to be radiated down the induction pipe and through the intake filter and so out into the atmosphere. This is particularly noticeable on very large rotating induction systems where the noise levels may exceed 120dB in the higher 2000 to 4000 Hertz frequencies.

The design has a central pod, partially obscuring the line of sight which combats the flow velocity noise associated which the vast quantities of cool air required to feed all forms of internal combustion engines, small gas turbines, boliers and blowers of all sizes and configurations.

With additional modifications the silencer range can be adapted for use inline on low pressure steam, air or gas pipelines, where noise radiation may be evident. Under slightly different circumstances the design can be used for medium to high velocity exhaust and air discharge applications in chimneys, exhaust stacks and flueds. The designs can be extended to longer lengths, increasing the insertion loss with little or no increase in pressure drop across the unit. This makes the concept useful for many arduous tasks and installations which other designs cannot match.

Approximate Typical Insertion Loss Figures for HPSC 1 and HPSC 1-SE Type Units (Not Binding)


HPSC 1 and HPSC 1-SE Insertion Loss

The HPSC 1 and HPSC 1-SE (Side Entry) type Air Intake Attenuation Silencer is a simple energy converter utilising both the flow and energy in the intake duct and the upstream noise from axial or centrifugal fans, turbochargers, superchargers, roots blowers or similar air moving equipment to excite individual fibre of various lengths in the acoustic infill to vibrate and create friction, resulting in heat, which is then dissipated to the passing airflow.

The designs also inadvertently use the Helmholtz principle to increase the insetion loss to approximately 25dB(A) to give a clean type silencer with a low pressure drop and good capabilities at 500 hertz and greater in the octave band spectrum.

Silencer Part NumberABCDWeight (kg)
HPSC1 250 (F)254.0410.01100.0900.050.0
HPSC1 300 (F)304.8460.01100.0900.065.0
HPSC1 350 (F)355.6510.01100.0900.075.0
HPSC1 400 (F)406.4560.01200.01000.090.0
HPSC1 450 (F)457.2610.01200.01000.0108.0
HPSC1 500 (F)508.0660.01300.01100.0130.0
HPSC1 550 (F)558.8710.01300.01100.0140.0
HPSC1 600 (F)609.6760.01400.01200.0155.0
HPSC1 650 (F)660.4810.01500.01300.0170.0
HPSC1 700 (F)711.2860.01600.01300.0210.0
HPSC1 750 (F)762.0920.01700.01400.0225.0
HPSC1 800 (F)812.8960.01800.01500.0275.0
HPSC1 850 (F)863.61020.01900.01600.0290.0
HPSC1 900 (F)914.41080.02100.01700.0320.0

‘S’ denotes B.S.P. Screwed versions are available as standard.
‘F’ denotes Flanged versions are available in BS10 Table D drillings as standard.
All dimensions and wieghts given are approximate and may vary under manufacturing conditions.
All dimensions and weights given are not binding and may change without prior warning.
Larger sizes are available upon requestas well as bespoke design and manufacture.
All units can be installed vertically as well as horizontally without detriment acoustically.

HPSC1 & HPSC1-SE Type: Central PodLow Pressure Drop - Air Intake Attenuator

25dB(A) Insertion Loss

HPSS1 & HPSS1-SE Type: Central Pod­Low Pressure Drop - Air Intake Attenuator

35dB(A) Insertion Loss