Pressure Transmitter for Gas Pipelines

Replies

• 

  Ramani Aswath

  IMARAN I KHAN

  but when it comes to gas pipelines it is very hard to detect small size leaks using the same wika sensors when gap between two monitoring stations is very large. Can anyone have any idea about differential pressure transmitter?

  What has differential pressure to do with leaks? For any flow to take place there has to be a differential pressure, without any leak.
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• 

  IMARAN I KHAN

  Dear Sir,
  
  Thank you so much for your reply.
  
  Here in Saudi Arabia the distance between two monitoring stations will be too large (means around 15 to 20 Kms) that negative pressure wave signal could not reach both the sites. Here in saudi aramco standards they want us to detect 18 mm leak on 56" gas piepeline having 700 psig. We use Wika sensors which have accuracy of about +/- 0.5% .
  Engineer from Saudi Aramco telling us to use Differential pressure transmitters (DPT) between two distant monitoring sites. DPT having accuracy of around +/- 0.04%.
  When we are using DPT need to connect 1 input to main pipeline pressure and other input to have a pressure drop for 18 mm leak which should be connected using solenoid valve.
  Since we are facing problem in DPT's for maintaining a constant pressure at the pressure drop port.
  Can you help me out in any other from which we can detect 18mm leak.
  Here people are comparing same methods for both Gas and Crude.
• 

  Ramani Aswath

  It may help us understand better if you could post a sketch of the above scheme. Even a hand sketch will do.
• 

  IMARAN I KHAN

  Dear Sir,
  
  Please find the details of setup
  
  #-Link-Snipped-#
  
  Attached document contains the details of setup.
• 

  IMARAN I KHAN

  Dear Sir,
  
  I have few doubts, can you tell me for below mentioned details is it possible to detect leak or not:
  
  Pipeline Dia: 56"
  Pipeline Pressure: 700 psig
  Flow: 1500MMSCFD.
  
  Using above parameters is it possible to detect 18mm leak when 2 pressure transmitters are 15 to 20 Km apart using negative pressure wave technique?
  
  We use here Wika E-10 Pressure transmitters.
  
  Waiting for your kind response.
  
  
• 

  IMARAN I KHAN

  Dear Sir,
  
  I am waiting for your help is this method works for Pipeline Leak Detection System.