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Central North Sea Capability

Gas from the Central North Sea fields is transported onshore via the CATS Pipeline.

Gas from the CATS pipeline that arrives on Teesside is called “wet” gas as it still contains Natural Gas Liquids (NGLs) as well as some water. This wet gas is unsuitable for use by consumers and requires processing before it can meet the specifications required for entry to the National Transmission System (NTS) or for sales to local industrial consumers on Teesside.

Processing of gas from the Central North Sea takes place in our dedicated Central North Sea processing train, Train 2. Since start-up availability of the processing train has been in excess of 99.6%.

Initially, the wet gas undergoes a dehydration process to remove water present in the gas. Once the water is removed, the gas is chilled and the NGLs are removed leaving predominantly methane in the gas stream. This is then metered and exported as “dry” or sales quality gas. The NGL undergoes further treatment through fractionation where the NGL is separated into three useful products; Propane, Butane and Condensate. The separate petroleum products are then transferred by pipeline either to liquid storage or to other petrochemical businesses based on Teesside for use as feedstock. The Train 2 processing schematic is shown below.

CNS Train 2 Process Overview

Please click the image for a larger version

The sale of natural gas liquids extracted during gas processing can create significant value for a user of the TGPP. From the outset, TGPP has integrated the technology and metallurgy that enables deep liquids recovery rates whilst exporting gas at high pressure into the NTS. 

In 2010 TGPP  invested in two projects to enhance Train 2 capabilities; a Debottleneck Project to increase capacity from 400 mmscfd to 450 mmscfd and a Liquids Enhancement Project to improve Train 2 NGL recovery.  Operational since 2012, these upgrades enable Train 2 to achieve an optimum liquids recovery rate of around 12.5% on average when measured on an energy equivalent basis. 

Gas and natural gas liquid prices are continuously monitored and should the need arise the flexibility of the plant is such that we can switch to minimum extraction mode in less than 12 hours. Of course, we can also switch back again in a similar space of time.