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Downstream of control or safety valves that emit gases or steam into the open air or regulate pressure or volume flows within a piping system, blow-off or piping silencers are often required to limit the noise emissions of the entire system to the legally required limits.
The silencers should be matched to the corresponding sound sources; safety valves can withstand back pressures of 10 to 15% of the valve response pressure.
There are several advantages to exploiting this limit:
- the valves themselves are relieved and may become quieter,
- the pipes behind the valve can be smaller, and
- the silencers can be optimally flowed through.
In contrast, pressure losses must often be minimised in pipe silencers in order to maintain the full control range of the valves. In some circumstances, two silencers upstream and downstream of the valve must be matched to the control behaviour of the valve, and in addition, pipeline insulation must be adjusted to the acoustic effect of the silencers or can be omitted entirely, so that the use of silencers enables cost savings.
Start-up systems in power stations consist of control valves, start-up expanders, condensate tanks, blow-off silencers and a multitude of pipes, which are also interdependent in terms of dimensions, control behaviour and acoustic effect.
Due to combustion processes and slow speeds, engines often generate low-frequency sound emissions, sometimes with a high single-tone content, which require the use of special resonator silencers, possibly in combination with absorption silencers. The arrangement of the silencers in combination with the dimensioning of the ducts and duct insulation in turn constitutes a complete exhaust system in which all components must be coordinated. This also applies to the intake side of the engines (intake opening with filter, silencer and ducts), where the acoustic effect and the pressure losses of the filter and silencer must be adjusted.
All of the above examples are intended to show that, just like the other components of a functional overall system, silencers often only achieve their best efficiency when they are optimally coordinated with each other. To ensure this without any loss of information and to keep the interfaces and thus the amount of work for our customers to a minimum, we offer complete systems from fittings to blow-off silencers, exhaust systems from engine flanges to soundproofed, insulated exhaust pipes.
