Docstoc

Bacton blending feasibility study

Document Sample
Bacton blending feasibility study Powered By Docstoc
					Bacton blending feasibility study


Gas Quality Workshop
23 April 2007
Dr Nick Bates, National Grid Gas Transmission
Bacton blending feasibility study

 Scope
 ABB report

 National Grid view on findings

 Summary
Bacton Blending - Scope

   Blending only
      Assume   sufficient compliant gas available
Bacton Blending - Scope

   Blending only
      Assume   sufficient compliant gas available

   Allow minor modifications to assets
Bacton Blending - Scope

   Blending only
      Assume   sufficient compliant gas available

   Allow minor modifications to assets

   Gas leaving the site must be compliant with
    GS(M)R
Bacton Blending - Scope

   Blending only
      Assume   sufficient compliant gas available

   Allow minor modifications to assets

   Gas leaving the site must be compliant with
    GS(M)R

   Define response requirements for measurement
    and control (valve)
Bacton Blending – ABB Findings

   It is feasible to implement a measurement and
    control system for blending at Bacton
Bacton Blending – ABB Findings

   It is feasible to implement a measurement and
    control system for blending at Bacton
      TheBacton pipework provides a non-ideal blending
      arrangement




     Ideal                          Bacton
Bacton Blending – ABB Findings

   It is feasible to implement a measurement and
    control system for blending at Bacton
      The Bacton pipework provides a non-ideal blending
       arrangement
      Control system would depend on feed-forward control



                   GQ     GQ
                                                            Limit
                                                    Safety Margin


                                                           Set point

        Feedback                     Feed forward
Bacton Blending – ABB Findings

   It is feasible to implement a measurement and
    control system for blending at Bacton
      The Bacton pipework provides a non-ideal blending
       arrangement
      Control system would depend on feed-forward control

      Transient changes in gas quality are a significant issue
Bacton Blending – ABB Findings

   It is feasible to implement a measurement and
    control system for blending at Bacton
      The Bacton pipework provides a non-ideal blending
       arrangement
      Control system would depend on feed-forward control

      Transient changes in gas quality are a significant issue

      Some supplies are connected at Bacton in a way that
       makes blending infeasible, e.g. BBL supply
Bacton blending – National Grid view
   Whilst it is feasible to implement blending
    measurement and control there are implications for
    National Grid and the gas industry
      The  blending depends on sufficient compliant gas to
       blend with non-compliant gas
      The control system would have an effect on flows –
       potentially including end of day quantities
      Further detailed work would be required to make a case
       that the blending system would not increase the risk of
       unsafe gas within the UK gas network
      Implementation of blending could introduce constraints
       within the remainder of the Bacton site
Bacton blending - Summary

 It is feasible to install a blending measurement and
  control system at Bacton but further work is
  required to demonstrate that there would not be a
  significant additional gas quality risk
 Any service is likely to be constrained and may
  only be available on an interruptible basis
 The constraint on operation may include the NTS
  downstream of the Terminal
 Whilst only Bacton has been studied, similar issues
  are anticipated at other National Grid entry points

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:0
posted:4/14/2013
language:Unknown
pages:13