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| We have previously considered
siting the gas treatment facility on our existing operational site
at Albury. However, recognising the need to minimize the amount of
development within the Surrey Hills Area of Outstanding Natural Beauty
(AONB), we have looked at other alternatives. The scheme as now proposed
would see the development of the gas processing facility within the
parish of Ripley. This is an intermediate location between the well
site at Albury and the tie-in to the gas grid near West Horsley. |
The selected location for the proposed
gas processing facility is adjacent to Furze Copse some 800 metres
east of Send Prison. The site is arable land and is bordered on
the northern, eastern and southern boundaries by trees providing
screening. Access to the site is via an existing track from to the
west of the site. The nearest villages are West Clandon approximately
1.5km to the west and West Horsley approximately 1km to the east.
Send Prison is situated approximately 800 metres to the west. The
location is shown on the project plan.We believe the new site for
the gas processing facility has planning and environmental benefits
including:
- It minimises development within the AONB whilst still making
the project technically and economically viable
- The site is generally remote from residential population, reducing
any potential visual and noise impacts on local people
- The site is already partially screened and it will be possible
to increase this with earth mounding and new tree planting.
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Gas processing facility site |
The gas processing facilities would comprise
the above-ground equipment required to treat and compress the gas
during injection and withdrawal. The site would occupy an area of
some 3.5 hectares. It is anticipated that the tallest parts of
the plant would not exceed the existing tree line. As the design
develops further illustrations of the gas processing facilities
will be posted on this site. |
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| The operation of the gas store
depends upon the gas demand in the national gas market which determines
whether the gas is injected or withdrawn. Although the gas processing
facility must be available all year, it is expected to operate for
approximately 70per cent of the time. It would be permanently manned
and operated from a dedicated control room within the site. The same
control room would also remotely operate all other project components
from the wells at Albury to the AGI near West Horsley. |
| Natural gas taken from the
gas grid would be metered as it enters the facility. The small quantity
of odorising agent present in the gas drawn from the grid would be removed using
a process which chemically reacts the odorising agent with a solid
granular catalyst resulting in a spent and stable product. The gas
would then be compressed to raise the pressure to reservoir pressure.
The reservoir pressure will vary as it is filled from empty to full. |
| During withdrawal, and depending
on reservoir pressures, gas would initially free flow from the wellhead
to the gas processing facility but as the reservoir pressure falls
gas would be compressed to meet the gas grid pressure specification.
When in the reservoir the gas would contact water and natural
gas liquids. After compression, the gas would, therefore, enter
a dew point control process to reduce the water / liquid content
to the level specified for entry into the grid. |
| The first phase of construction
of the facility would involve clearance and profiling of the site,
provision of foundations for the major structures and an engineered
drainage system. A temporary construction camp would be set up.
Process plant would be transported to the site for erection and
installation on an ‘as needed’ basis to avoid long-term
storage. Off-site fabrication and pre-assembled units would also
be utilised where possible to minimise work at site.
The construction phase of the gas processing facility would take
about 18 months. Access routes would be identified to ensure minimal
disruption from construction traffic.
Once installation of all project components was completed, the
project would enter a commissioning phase when gas from the Scotia
Gas Network was slowly introduced with the pressure gradually rising
to the operating level. This phase would take about three months.
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