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Offtake Arrangements Document. 25 th February 2011. Revisions to Offtake Profile Notices. 4 hours notice is required if the flow rate change at an offtake is not less than 50% of the Maximum Flat Offtake Rate (MFOR), 1/24th of the Maximum Daily Quantity

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revisions to offtake profile notices
Revisions to Offtake Profile Notices
  • 4 hours notice is required if the flow rate change at an offtake is not less than 50% of the Maximum Flat Offtake Rate (MFOR), 1/24th of the Maximum Daily Quantity
  • 2 hours notice is required if the flow rate change at an offtake is less than 50% but not less than 25% of the MFOR
  • 1 hour notice is required if the flow rate change at an offtake is less than 25% of the MFOR
  • 1 hour notice is required when there is a decrease in rate of offtake
revisions to offtake profile notices1
Revisions to Offtake Profile Notices
  • The minimum notice required if there is a change in the aggregate rate of offtake to an LDZ is 2 hours
  • The aggregate flow rate change shall not exceed 5%
  • A revised Offtake Profile Notice (OPN) must not be submitted more frequently that once in each hour
  • A revised OPN must not be submitted later that 04:00 on the gas flow day
low demand days
Low Demand Days
  • If at the 13:00 preceding day demand forecast the demand for an LDZ is less than 50% of the 1 in 20 peak day, NTS can declare a low demand day prior to 17:00 on the preceding day. If this is declared the DNO is required to flow at a flat profile. A revised OPN can be submitted to reflect changes in the forecast LDZ demand.
offtake tolerances
Offtake Tolerances
  • The tolerance for an offtake is 10% of the prevailing offtake rate. The tolerance in aggregate for all offtakes is 3% of the aggregate prevailing offtake rates.
pressure
Pressure
  • The DNO shall submit a pressure request for each offtake when submitting the initial OPN for the day. A revised pressure request can be sent up to but not after 24:00 hours on the day. In agreeing a pressure the NTS will consider the safe and efficient operation of the NTS and the DNO will consider the safe and efficient operation of the LDZ.
tpd user offtake obligations
TPD – User Offtake Obligations
  • The maximum permitted rate in respect of an NTS LDZ offtake is a rate calculated as:

(Flat Capacity / 24) + (Flexibility Capacity / 4)

  • NTS will not be obliged to make gas available for offtake in the period between 06:00 and 22:00 hours on any day in a quantity which exceeds

(Flexibility Capacity) + (16/24 * Daily Quantity)

issues
Issues
  • All offtakes, regardless of their mode of operation (volumetric or pressure controlled) and booked MDQ, are treated identically in terms of changes to flow rates.
  • Offtake tolerances are breached in the first and last hours of the gas day for volumetric offtakes due to gas demand changes.
  • NTS could declare a low demand day for 6 months of the year in a seasonally normal demand year if they wished to do so.
  • Pressure requests are required for all offtakes regardless of their criticality to the NTS or to the DNO.
issues1
Issues
  • The NTS can request a lower pressure at an offtake that meets the safe and efficient rule but causes the DNO to operate a different offtake in the same LDZ above the booked MDQ. This can also cause breaches to offtake flow rate and OPN tolerances
  • Clarification of flow swap rules
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