Vent Silencers

Steam exhausts
Air vents
Process Gases
Relief valves
Safety valves
Bypass valves
Blow down vents
High temp vents

Diffuser Silencers

Atmospheric vents
Control valves
Pressure let down
Steam Vents & Process Vents
Pressure regulators

In-Line Silencers

Control valves
Orifice plates
Gas ejectors
Steam ejectors
Gas compressors
Axial compressors
Centifugal compressors
Roots blowers and
Multi-lobe blowers and exhausters

Surge Tanks

Drinking Water
Raw water
Foul Water

Ancillary Surge Controls & Equipment

Air Compressors
Electrical Controls Control Panels
Level Controls

Flo-Dyne Installation & Commissioning Services

Pipeline Surge Analysis & Reporting

Refurbishment and repair

Surge Vessels
Compressor systems
Control panels

Pulsation Dampeners

Roots Blowers
Multi-Lobe Blowers
Recip compressor
Recip pumps Suction Lines
Discharge Lines

Acoustic Filters

Hydraulic pumps
Refrigerant Compressors
Air Conditioning Compressors

General Information

Quality Registration to

Surge Tanks


Vent Silencers


Pulsation Dampeners


In-line Silencers

Blower Silencers





Atmospheric vent silencers are used to control the noise created when steam, air, natural gas, nitrogen, oxygen or other process gases are vented (blown off) from a high pressure to a lower pressure. At such times high noise levels are generated which may be dangerous to plant personnel and as well as being environmentally unacceptable.

Whether the release of the gas is planned or unexpected Flo-Dyne can offer the most economical approach by optimizing silencer design to produce a guaranteed solution through selection of silencer pressure drop and flow velocities within the silencer appropriate to the duty and noise level required.

Flo-Dyne's atmospheric vent silencer model type BOS can be supplied with or without a inlet diffuser to let down the inlet pressure so that it is suitable to pass through the absorbtive part of the silencer at near to atmospheric pressure prior to finally exhausting to atmosphere.

Where the silencer is provided with an inlet diffuser then the diffuser is constructed to the requirements ASME pressure piping and vessel codes, with either X-Ray, Ultasonic or penetrant dye examination. Were possible diffusers are also
vent silencer schematicpressure tested after welding.

The pressure drop across the inlet diffuser is selected according to the duty of the silencer, we can examine the pressure losses through the pipework and reccomend the most suitable silencer pressure drop for the vent duty.

If there is a significant length pipework between the venting valve and the silencer, the pressure drop across the venting valve may lead to high noise levels being radiated by the pipework. Flo-Dyne can advise on noise levels radiated by pipework in such cases, and make reccomendations for mitigation.

Silencers may be packed or pack free diffuser only types depending on the duty requirements. Where a packed silencer is needed the packing material will often be chosen from glass fibre, mineral or ceramic fibre as considered appropriate for the operating conditions.

The structural design of the Flo-Dyne Vent Silencer is given the same thorough attention as its acoustic design. The external shell is constructed of seamless pipe in smaller sizes and
continuously welded rolled plate in larger diameter silencers. Mounted horizontally or vertically, pads or cradle type supports are available for easy installation.

Contact us now with your requirements.

UK office:
Tel: +44 (0) 1494 770088
Fax: +44 (0) 1494 770099
Email: sales@flo-dyne.net

India office:
Tel: + 91 77 384 97 300
Email: sales-india@flo-dyne.net