; Bacton blending feasibility study
Documents
Resources
Learning Center
Upload
Plans & pricing Sign in
Sign Out
Your Federal Quarterly Tax Payments are due April 15th Get Help Now >>

Bacton blending feasibility study

VIEWS: 0 PAGES: 13

  • pg 1
									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

								
To top