Document ID: EPA-HQ-OW-2004-0002-0540
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-30T05:00Z

Cooling
Water
Intake
Structure
(
CWIS)
Information
Data
Required
Rig
Information
Rig
Name
Transocean
Rather
Transocean
Richardson
Rig
Type
Semi
Submersible
Total
Installed
Power
Generation
Capacity
21000
HP
(
including
emergency
generator)

Number
of
Cooling
Water
Intake
Structures
(
CWISs)
4
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
Sea
Chest
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
6
ft.
pipe
12"
diameter
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
Simplex
Basket
Strainers
Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
4,583,302
gal
(
17400
metric
tonnes)

Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
4,583,302
gal
(
17400
metric
tonnes)

Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
4.41fps
(
725
metric
tonnes/
Hr)

List
of
Purposes
of
Cooling
Water
Intakes
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes)
Engine
cooling,
Watermakers,

List
of
Purposes
of
Non­
cooling
Water
Intakes
(
e.
g.,
fire
water,
hotel
loads)
Fire
Main,
Ballast,
Sanitary,
Pits,

Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
3,424,306
gal
(
13000
metric
tonnes)
Time
on
location.
4.41
fps.
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
The
rig
does
not
carry
much
ballast
water
from
location
to
location.
It
is
taken
on
and
dumped
at
the
same
location.
Mitigation
Measures
for
reducing
Impingement
and
Entrainment
of
Aquatic
Organisms,
as
well
as
Bio­
fouling
Prevention
Measures
Sea
chest
screens,
simplex
baskets,
cathodic
protection
for
marine
growth
and
corrosion
Is
the
Rig
equipped
with
a
Radiator
Cooling
System
for
the
Main
Engines?
Alfa
Laval
plate
heat
exchangers