Environmental Statement - Maersk Oil

B ‐ 10
Drainage water Discharge of oily drainage
water to sea. Open drains
collect spills & drainage from
all hazardous and non‐
hazardous areas of the FPSO.
These drains feed into the
drainage caisson which
provides oil & water
separation.
No increase in drainage water
is expected as a result of the
production covered in this ES.
Chemical discharges Discharge of chemicals.
There will be a increase in
chemical use associated with
the Balloch development, this
will not result in any increases
in chemical discharges at the
FPSO as chemicals will be
transported entrained within
reservoir hydrocarbons.
Cooling water Seawater is utilised to cool the
cooling medium (70% water
and 30% TEG) and used to cool
the heat exchangers. This
result sin an increase in the
temperature of the seawater
returned and small amounts of
glycol are released into the
sea.
Oil in water can result in narcotic, toxic, teratogenic impacts
and enrichment etc.
Likelihood Consequence Risk
5 1 Low
May result in a variety of impacts including increased
chemical or biochemical oxygen demand, toxicity,
persistence, bioaccumulation in animals.
Likelihood Consequence Risk
5 1 Low
High concentrations of glycol are toxic to marine life, elevated
water temperatures may be intolerable to marine life not
observable increase in water column temperature beyond
immediate zone of discharge.
Likelihood Consequence Risk
5 1 Low
Balloch Field Development Environmental Statement
Regular maintenance of drainage
system through inspection &
engineering maintenance strategy
with safety critical elements being
subject to a higher degree of
maintenance. Use of skimming
pump. Given the prevailing
current speeds, dilution will be
rapid with no perceptible effect
on water quality with the except‐
ion of the immediate vicinity of
the discharge.
Maersk has a Company Policy to
minimise waste which includes
reducing the quantity of
chemicals used. Usage must not
exceed permit conditions. Tanks
are fitted with overflow alarms.
Drums are stored in bunded areas
(at skids or in storage areas).
Most equipment is provided with
drip trays. Chemicals used are
generally the lowest toxicity HQ
category.
No new equipment required on
the GPIII therefore no changes to
cooling demand or volume of
water discharged.
Appendix B ‐ Environmental Assessment
Negligible impact.
Low impact.
Negligible impact.