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The Voice of the Networks
Energy
Networks
Association
Flow Weighted
Average Calorific
Value Options
Biomethane Campaign Working Group
7th August 2014
Current Arrangements
CV + vol separate due to the
limitations on historical
protocol (modbus)
Only
volume
BEU
GCoTE
GSMR
DATA
RTU
volume
DNCC
GNCC
ΣFWAC
“Energy management
team” (manage the
FWACV process)
CalibrationGases
CVDD
Controller
2551
Approved device
- LoA
Meter
Meter not under LoA but
interpretation of TER is
requisite (% accuracy)
2
volume
DANINT interfaces with CVDD and
meter to collect data
Approved software under LoA
CV
PC DANINT
HPMIS
XOSERVE
FC
EOD File
The Voice of the Networks
Low Flow Sites 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
Customer
PLC
RTU
DNCC
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
3
The Voice of the Networks
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
Calibration Gases
Approved
software - LoA
Approved device
- LoA
CVDD
Customer
PLC
RTU
DNCC
GNCC
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
4
The Voice of the Networks