Vent Silencers

A vent silencer or a blow off silencer is a device used to reduce unwanted noise created by gas or steam flow in a pipeline discharging directly into the atmosphere. This noise can be generated due to the high velocity flow through the valve and turbulence created around any obstacle in the line that suddenly restricts or changes the direction of flow such as valve or an orifice.

Vent silencers find wide applications in high pressure vents, steam vents, safety relief valve outlets, system blow downs and purge outlets etc.

Vent and blow down noise is a function of upstream pressure and temperature, type of gas being vented, the valve size and type, plus the effect of downstream piping.

Each vent silencer is designed to attenuate the noise level to the required sound pressure level criteria at a given distance from the silencer..

In any steam or gas venting / blow off system, the primary release of noise energy occurs at the open stack exit. The blow off silencer is installed either within the stack or at the stack outlet to intercept this noise before it escapes into the environment. There are two fundamental noise reduction principles used in passive silencer design. Dissipative components (using sound absorbing material) provide balanced noise reduction over a broad frequency range. Reactive components, using resonant reflections within tuned chambers and passages, provide peak noise reduction in a more concentrated frequency band. our vent silencers combines both dissipative and reactive technology in a highly efficient design.

Type of silencers

Generally Steam vent silencers are used for Steel & Power plants, Chemical plants, Petrochemical refineries & Oil & Gas Plants with various applications with various types

  •  Boiler start-up vent / Safety valve silencers
  •  Turbine start up vent / Warm up vent silencers
  •  Boilers steam blow off silencers
  •  Ejector fan silencers
  •  Flash tanks Drain steam vent silencers
  •  PSV control valve steam vent silencers
  •  Compressor gas vent silencers
  •  Compressor air vent silencers
  •  Compressor air blow off silencers
  •  Autoclave steam vent silencers et...

Data Required

1 Type of air/gas/vapour
2 Molecular Weight
3 Cp/Cv
4 Flow rate (TPH/ Kg/hr)
5 Pressure upstream of vent valve (Kg/cm2/ Bar )
6 Pressure at inlet to silencer (Kg/cm2/ Bar )
7 Upstream temperature (ºF/ ºC)
8 Inlet temperature (ºF/ ºC)
9 Valve line size (Inches / mm )
10 Silencer Connection size & type (Inlet) (Inches / mm )
11 Unsilenced noise level(dBA)
12 Desired silenced noise level(dBA)

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