Vent silencer -For pipeline pre comm application

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SUMMARY

The discussion focuses on the design of a vent silencer for a 48-inch pipeline during gas pipeline pre-commissioning activities. The pipeline, measuring 1220 kilometers, will undergo depressurization from 20 barg to 0.5 barg over a period of 5 days. Dry air will be injected to propel pigs and remove water, which will be disposed of at the other end. The critical parameter for the design is sound attenuation, targeted at 85 dBA at 40 meters, with temporary piping connected using SCH 40 pipe and ANSI #300 RF flanges. For acoustic analysis, "Noise Control" by Colin Hansen is recommended as a resource.

PREREQUISITES
  • Understanding of pipeline engineering principles
  • Knowledge of acoustic analysis techniques
  • Familiarity with ANSI flange standards
  • Experience with gas pipeline commissioning processes
NEXT STEPS
  • Research "Noise Control" by Colin Hansen for acoustic design insights
  • Explore methods for calculating sound attenuation in pipeline systems
  • Investigate the use of SCH 40 pipe in temporary pipeline applications
  • Learn about gas pipeline commissioning and depressurization techniques
USEFUL FOR

Pipeline engineers, acoustic consultants, and project managers involved in gas pipeline commissioning and sound management during depressurization activities.

badri2221
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I am looking forward to design vent silencer , which shall be temporarly connected to the 48'' pipeline for depressurising activites during gas pipeline pre comminissioning ativites.

Dry air shall be injected into pipeline which shall proppel the pigs and move the water infort of the pigs for an overall pipeline length of 1220 kms these water shall be disposed off into sea from the other end ,

its is clcullated that there will b pressure of 20 barg dry air in the pipeline which has to be depressurised over 5 days through the vent silencer .

Parameters :

48" Pipeline,1220 km

Pipeline pressure to be depressurised from 20 barg to 0.5 barg

Scheduled time for depressurisation is 5 days

Sound Attenuation 85 Dba at 40m as a basis for the model ( this being the critical parameter)
Temporary pipe work which connect the main pipeline to vent silencer is SCH 40 pipe with Ansi #300 RF flanges.
 
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I believe your question concerns acoustic analysis. In this case, I would recommend "Noise Control" by Colin Hansen for a detailed treatment.