Document ID: EPA-HQ-OW-2004-0002-0537
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-30T05:00Z

Cooling
Water
Intake
Structure
(
CWIS)
Information
Data
Required
7­
24­
02
Rig
Information
Rig
Name
Cajun
Express
Sedco
Energy
Sedco
Express
Rig
Type
Semisubmersible
(
Dynamically
positioned)
Total
Installed
Power
Generation
Capacity
41,286
HP
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
3
ea.
Port
and
3
ea.
Starboard
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
32"
sea
chest
inlet
to
a
14"
strainer
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
Yes
14"
flange
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
14"
/
8"
corrugated
basket
strainer
Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
1,019,130
gals
(
24,265
bbls)

Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
142,572
gals
(
3,466
bbls)

Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
0.23
fps
List
of
Purposes
of
Cooling
Water
Intakes
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes)
Engine
cooling,
Mud
pumps,
Dowell
unit,
ROV,
Air
compressors,
HP
compressors,
Synchrodrive,
Thrusters.

List
of
Purposes
of
Non­
cooling
Water
Intakes
(
e.
g.,
fire
water,
hotel
loads)
Dowell
educator,
Mud
pits,
Gumbo
dump
Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
16,458,624
gal
(
391,872
bbls)
when
you
need
ballast
6.38
fps
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
The
rig
doesn't
carry
any
ballast
water
for
location
to
location.
Ballast
is
taken
and
discharged
while
at
the
same
location
Mitigation
Measures
for
reducing
Impingement
and
Entrainment
of
Aquatic
Organisms,
as
well
as
Bio­
fouling
Prevention
Measures
Sea
Chest
strainers,
cathodic
protection,
sacrificial
anodes
are
use
thought
the
barge
and
hull,
and
in
ballast
tanks.

Is
the
Rig
equipped
with
a
Radiator
Cooling
System
for
the
Main
Engines?
No