Gas quality requirements

Gross Calorific Value (a) kWh/Nm3 10.81(b) 12.39
Wobbe Index (a) kWh/Nm3 13.82 15.07
Hydrocarbon Dew Point °C (1 to 69 barg)   -2
Water Dew Point °C (at 69 barg)   -10
Oxygen content ppm by vol   1000
Carbon Dioxide content Mole %   2.5
Hydrogen Sulphide content  ppm by vol
Total Sulphur at any time mg/m3   30

(a)  Combustion reference temperature is 15°C.
(b)  Subject to an IUK shipper’s reasonable endeavours to provide gas at a minimum of 10.94 kWh/Nm3 at the Delivery Point.

IUK does not have the facility to blend gas which does not comply with these specifications.


Operating conditions

Required pressure at the NTS and SILK Delivery Points barg 45.0 70.0
Required pressure at the FTS Delivery Point barg 55.0 80.0
Required temperature at the NTS and SILK Delivery Points °C 1 28(c)
Required temperature at the FTS Delivery Point °C 2 38

(c)  The maximum temperature for offtake at SILK is 20°C