Feb 2012
Gas Transmission
Develop novel mitigation method for high frequency main pipework vibration
Feb 2012
Dec 2014
National Grid Gas Transmission
Joanne Harris (box.GT.innovation@nationalgrid.com)
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Network Innovation Allowance
Gas Transmission Networks
There are a number of possible mitigation methods which can be used to address this issue depending on the nature of the excitation, including:

  • Changes to the source such as alteration of compressor impeller clearances

  •  The installation of compressor Helmholtz dampers

  •  Installation of acoustic material or a silencer inside the pipe

  •  Attachment of external damping material

  •  Welding of stiffening rings to the pipe work.

The practicality and feasibility of each of these methods depends on the stage in the plant life cycle the problem has been identified.

The programme will theoretically evaluate a series of cost effective approaches to attenuate high frequency vibration within transmission pipe work. The programme will perform proof of concept trials with the currently favoured grouted ring concept.

The programme will deliver an assessment of the latest high frequency vibration attenuation thinking with respect to gas transmission pipelines. This, coupled with the testing of the grouted ring dampener will give National Grid a wide range of effective solutions to deal with this phenomenon.