Document ID: EPA-HQ-OW-2004-0002-0511
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
SF
140
SF
135
Glomar
Celtic
Sea
Glomar
Arctic
1
Glomar
Arctic
3
Glomar
Arctic
4
Aleutian
Key
Glomar
Grand
Banks
Jutlander
Dada
Gorgud
Istigal
Rig
Type
Semisubmersible
F
&
G
Enhanced
Pacesetters,
and
Pacesetters
Total
Installed
Power
Generation
Capacity
7800
HP
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
2
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
4ftx14"
dia
pipe
reducing
to
12"
dia
with
flange
and
valve.
Screen
outboard
30"
x48"
c/
w
462
1"
dia
holes
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
Duplex
Basket
Strainers
Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
3,599,400
gal
(
85700
bbls)
(@
2500gpm)

Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
3,599,400
gal
(
85700
bbls)
continuous
intake
and
discharge
Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
3.0
ft/
sec
List
of
Purposes
of
Cooling
Water
Intakes
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes)
Winch
cooling,
Brake
Water
Cooling,
HPU
(
High
Pressure
Unit)
,
Compressors,
AC
Units,
Water
Makers
Power
generators,
Propulsion
List
of
Purposes
of
Non­
cooling
Water
Intakes
(
e.
g.,
fire
water,
hotel
loads)
Fire
Main,
Ballast,
Sea
Water
Service,
Drill
Water
Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
1.6
 
2.1
million
gal
(
40­
50000
bbls)
of
ballast,
5­
7
hours
to
ballast
depending
on
deck
load.
Pumped
@
3300
gpm.
Inlet
velocity
=
3
ft/
sec
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
68,000
gal
(
approx
260T)
depending
on
deck
load.

Mitigation
Measures
for
reducing
Impingement
and
Entrainment
of
Aquatic
Organisms,
as
well
as
Bio­
fouling
Prevention
Measures
Duplex
strainers
fitted
along
with
cathodic
protection
system.

Is
the
Rig
equipped
with
a
Radiator
Cooling
System
for
the
Main
Engines?
No,
heat
exchangers
are
fitted.