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The Voice of the Networks. Energy Networks Association. Flow Weighted Average Calorific Value Options. Biomethane Campaign Working Group 7 th August 2014. Current Arrangements. CV + vol separate due to the limitations on historical protocol ( modbus ). Only volume. volume. RTU.

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Energy networks association

The Voice of the Networks

Energy

Networks

Association

Flow Weighted Average Calorific Value Options

Biomethane Campaign Working Group

7th August 2014


Current arrangements

Current Arrangements

CV + vol separate due to the limitations on historical protocol (modbus)

Only volume

volume

RTU

DNCC

GNCC

volume

BEU

GCoTE

GSMR

DATA

ΣFWAC

“Energy management team” (manage the FWACV process)

CalibrationGases

DANINT interfaces with CVDD and meter to collect data

Approved software under LoA

CVDD

Controller 2551

Approved device - LoA

CV

PC DANINT

HPMIS

XOSERVE

Meter

FC

Meter not under LoA but interpretation of TER is requisite (% accuracy)

EOD File


Low flow sites not directed

Low FlowSites Not Directed

  • Propose that sites less than a specified threshold input (10,000 scmh) are not directed sites

  • NEA specifies CV device accuracy and calibration – managed in the same manner as GS(M)R Removes the requirement for Approved devices and software

  • Agree accuracy class of CV measurement device and calibration regime – could ENA lead on defining this?

  • Customer still propanates to meet FWACV value supplied by DN (and if CV is too low, no flow allowed)

CV and volume follows identical route managed by Customers ‘Flow Computer

CVDD

RTU

DNCC

Customer

PLC

GNCC

Meter

  • This option reduces costs, complexity and is simple to implement

  • Will also facilitate new entrants and innovation in the Grid Entry Unit market

  • Customers are protected as FWACV is targeted by the Operator – governed by NEA with Ofgem oversight


Modified direction

Modified Direction

  • GCoTE would require that an approved software is still used

  • GCoTE also stipulate that the calculations must be carried out on site

  • Subject to agreement to amend GCoTE would still require reconciliation at DNCC

  • CVDD is still approved device so would need daily and 35-day test – this is a Gas Act requirement so harder to change

DANINT or Equivalent

Approved software - LoA

Calibration Gases

Approved device - LoA

CVDD

RTU

DNCC

GNCC

Customer

PLC

Meter

  • Significant effort and complexity developing alternative process and infrastructure for minimal benefit

  • Requirements for 35 day test and calibration remain along with Network Capping implications

  • Exactly same local consumer impact as the “Not Directed” option but would incur higher costs


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