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Noise Silencers

Noise silencers are used for reduction of noise emission of steam let into atmosphere from outlets of safety valves, start-up valves, expanders, etc. Values of acoustic performance generated by choking of steam in valves range between 135 and 185 dB. The usual damping values required, which depend on local operating conditions and the duration of noise exposure, range between 30 – 90 dB.

The capacity rating of regular silencers ranges from 5t to 200t of steam per hour, at temperatures from 100°C to 540°C. The silencer height starts from 1.5 m for damping around 30 dB up to 4 m for the top damping effect.

Silencers are usually designed to employ choking of steam output and absorption gates. The operating pressure in reducing element is usually set to 10 per cent of steam pressure before valve. The last stage level is designed with sub-critical pressure gradient. Absorption gates are made of corrosion-resisting perforated metal sheets and absorbent insulation substance with stone or basalt wool.

Connections of outlets to silencers may be equipped with expansion sealings to reduce both the axial shift as well as lateral displacement of the piping.

Silencer shells supplied are made of carbon, low-alloy or corrosion-resisting steel, according to specific project conditions. The outer surface of shell can be either coated or insulated with plating. The mouth of silencer is fitted with mesh to prevent entry of birds.

Please submit your inquiries about silencers to our project design personnel. The main details required for design completion are:

  • status values of steam before valve,
  • volume of steam passed through the valve,
  • required acoustic pressure level at the distance of 1 m (or other) from the suppressor,
  • dimensions of inlet piping,
  • operating pressure limit required in inlet piping,
  • requirement for compensation of inlet piping displacement,
  • requirement for service life and surface treatment.


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