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Sufficiently Complex Connection Involving Pipeline Construction and/or System Reinforcement

Sufficiently Complex Connection Involving Pipeline Construction and/or System Reinforcement. Project Sequence. Project Elements. Initial Enquiry. Feasibility Study. Conceptual Design. Detail Design. Construction. Initial Enquiry.

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Sufficiently Complex Connection Involving Pipeline Construction and/or System Reinforcement

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  1. Sufficiently Complex Connection Involving Pipeline Construction and/or System Reinforcement Project Sequence

  2. Project Elements Initial Enquiry Feasibility Study Conceptual Design Detail Design Construction

  3. Initial Enquiry • Enquiry is sufficiently complex as detailed by the DN’s Statement of Principles and Methods for Determining Connections Charges – Licence Ref. 4B. • Generally at this stage (depending on the specific enquirer’s request) NGN will normally issue the following: • A desktop assessment of the availability of supply. • A quotation for a Feasibility Study and associated timescales. • If possible a “ballpark estimate” of costs – This is usually based on pipeline cost curves and other costs from previous projects.

  4. Feasibility Study • Detailed network analysis. • Establish design alternatives. • Establish pipeline route corridors. • Develop principles from desktop study information to reach informed cost effective decisions based on engineering and environmental constraints. • Formulate a cost estimate (usually base cost + 30%) to allow high level decisions).

  5. Conceptual Design • Investigate design alternatives further. • Reduce risk and increase cost estimate accuracy. • Develop/refine solutions and options. • Define the essential elements and options for detailed design. • Formulate a cost estimate (usually base cost + 15%) to allow high level decisions.

  6. Detailed Design • Confirm pipeline route. • Initiate easement negotiations. • Confirm pipeline and/or reinforcement (e.g. offtake upgrades) design parameters. • Detailed routing study to fine tune pipeline routes. • Detailed design drawings for pipeline, special crossings, pressure reduction equipment etc.. • Detailed project programme. • Materials identified and maybe ordered.

  7. Possible Variations • For a small simple connection a feasibility, conceptual and detailed design studies may be one or the same thing. • Easement negotiations can be problematical. • Environmental surveys can be seasonal dependant.

  8. Points to Note • DN transmission connections/enquiries are: • Small in number • Bespoke • Dealt with by one or two people and so receive personal attention with continual dialogue • Flexible to meet customers needs • Have agreed timescales and milestones

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