Mumbai, Maharashtra, India
Our Products
Steam and Gas Vent Silencers for venting process gases, HP and LP steam, blast furnace gases and other gases or vapours from pressure.
In-Line silencers for compressors, control valve, pressure reducing valves, gas compressors and surface jet pumps, whether built into, or as part of your piping, or as standalone equipment.
Inlet and outlet silencers for rotary, roots type, blowers, screw compressors and centrifugal fans. Units are designed to eliminate the tonal noise produced by these types of equipment.
Simple diffuser silencers to provide an economic and reliable noise reduction when full size absorptive silencers are either not necessary, or not possible.
The Roots type blower is a positive displacement lobe pump which operates by pumping, or moving, a fluid, usually air, but in some cases a process gas, using a pair of inter-meshing lobed rotors, which have a profile that looks not unlike the number 8. When operating, the fluid is trapped in the outer pockets surrounding the lobes and is carried, or progressed, from one side of the machine to the other.
The lobe shaped rotors (usually two lobes, but it can be 3 or 4) work in tandem and move the fluid, usually air, from one side of the machine to the other. The lobes do not grab, or scoop the air out of the inlet pipe, but rather as they pass the inlet opening they cause a local low pressure area inside inlet port of the machine into which the fluid will then flow. As the rotors continue to turn the fluid that has entered the machine is trapped by the rotors and progressed from the inlet side to the outlet side. On reaching the outlet side the fluid has no choice but to be pushed out into the discharge pipe.
Each time one of the rotor tips passes either the intake or exhaust port, the passing of that tip causes a pressure pulse to be generated. Therefore in the case of a blower with rotors that have 2 lobes there will be 4 pulses for each complete revolution of the pair of rotors (2 pulses from each rotor for each revolution). This allows for a relatively easy estimation of the principal frequency of pulsation that the machine will generate.
Whilst the frequency of the noise from the passing of the rotor tips at the intake and exhaust ports is well understood, there is a second noise mechanism where the fluid tries to pass back through the machine from the high pressure side to the low pressure side by "slipping" around the rotors at their tips. This is an aerodynamic noise mechanism and is less easy to predict as the noise level changes with the speed of the blower and the gap between not only the rotors, but also between the gap between the rotors and the casing.
High pressure compressor silencers and inline compressors silencers are often specified for axial, centrifugal and turbo compressors which create broad spectrum noise with peaks at the blade passing frequencies.
If this noise is left untreated it will propagate into the attached piping where it will be radiated into the surrounding area. In some cases this will be a hazard to nearby workers, whilst in other cases it will become an annoyance to local residents.
In addition many piping systems suffer from propagation of low frequency noise both within the gas stream and along the pipewall.
Low frequency noise is often difficult to treat, in cases where this noise is travelling in the gas stream the silencer must be properly designed to attenuate such low frequencies, or the noise will simply pass straight through the silencer unaffected.
In addition, in many cases the acoustic performance of the silencer can be compromised by noise travelling along the pipe-wall. This is known as "flanking noise" and if left untreated will simply travel along the casing of the silencer unimpeded rendering the silencer ineffective.
The custom designed Flo-Dyne compressor inline silencer will treat these special noise problems to give a highly effective silencing solution.
High pressure compressor silencers and inline compressors silencers are often specified for axial, centrifugal and turbo compressors which create broad spectrum noise with peaks at the blade passing frequencies.
If this noise is left untreated it will propagate into the attached piping where it will be radiated into the surrounding area. In some cases this will be a hazard to nearby workers, whilst in other cases it will become an annoyance to local residents.
In addition many piping systems suffer from propagation of low frequency noise both within the gas stream and along the pipewall.
Low frequency noise is often difficult to treat, in cases where this noise is travelling in the gas stream the silencer must be properly designed to attenuate such low frequencies, or the noise will simply pass straight through the silencer unaffected.
In addition, in many cases the acoustic performance of the silencer can be compromised by noise travelling along the pipe-wall. This is known as "flanking noise" and if left untreated will simply travel along the casing of the silencer unimpeded rendering the silencer ineffective.
The custom designed Flo-Dyne compressor inline silencer will treat these special noise problems to give a highly effective silencing solution.
Optimum design of a compressor silencer requires not just an engineering solution to the acoustic baffle as well as the containing shell.
Failure to provided the correct balance of;
Fibre diameter, bulk density and composition
Perforated plate hole diameter spacing and thickness
Flow passage width and length
Packing depth and packing protection
Will result in poor acoustic performance and high pressure drops.
Flo-Dyne engineers will custom design the entire acoustic baffle and the containing shell providing an optimum total silencing solution thereby ensuring that the silencer is at its most effective during operation.
This will include examining the higher frequencies associated with blade passing and the lower, longer wavelengths associated with pipe-wall resonances and flexing.
The Roots type blower is a positive displacement lobe pump which operates by pumping, or moving, a fluid, usually air, but in some cases a process gas, using a pair of inter-meshing lobed rotors, which have a profile that looks not unlike the number 8. When operating, the fluid is trapped in the outer pockets surrounding the lobes and is carried, or progressed, from one side of the machine to the other.
The lobe shaped rotors (usually two lobes, but it can be 3 or 4) work in tandem and move the fluid, usually air, from one side of the machine to the other. The lobes do not grab, or scoop the air out of the inlet pipe, but rather as they pass the inlet opening they cause a local low pressure area inside inlet port of the machine into which the fluid will then flow. As the rotors continue to turn the fluid that has entered the machine is trapped by the rotors and progressed from the inlet side to the outlet side. On reaching the outlet side the fluid has no choice but to be pushed out into the discharge pipe.
Each time one of the rotor tips passes either the intake or exhaust port, the passing of that tip causes a pressure pulse to be generated. Therefore in the case of a blower with rotors that have 2 lobes there will be 4 pulses for each complete revolution of the pair of rotors (2 pulses from each rotor for each revolution). This allows for a relatively easy estimation of the principal frequency of pulsation that the machine will generate.
