Document ID: EPA-HQ-OW-2004-0002-0506
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
Galaxy
1
Glomar
High
Island
1
Galaxy
2
Glomar
High
Island
2
Galaxy
3
Glomar
High
Island
4
Magellan
Rig
127
Monarch
Rig
134
Monitor
Rig
136
Rig
Type
Jackup
F&
G
L780
or
equivalent
Jackup
Total
Installed
Power
Generation
Capacity
8800
HP
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
4
Deepwell
pumps
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
16"
Tower
pump
riser
into
12"
pipe
5
Rigs
with
20"
preload
caisson
for
water
intake
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
16"
opening
no
flange
5
Rigs
with
Prelaod
pumps
with
20"
open
pipe
w/
out
flange
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
Basket
Strainers
on
deck.

Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
2.0
million
gal
(
48,000
bbls)
5
Rigs
have
Preload
pump
5,500
gpm
Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
2.0
million
gal
(
48,000
bbls)

Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
Velocity
of
regular
submersible
pumps
=
2.23
ft/
sec
Velocity
of
Preload
pump
6.1
ft/
sec
(
5
rigs
only)
List
of
Purposes
of
Cooling
Water
Intakes
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes)
Watermaker
heat
exchangers,
fuel
oil
heat
exchangers,
mudpump
heat
exchangers,
air
handling
units
List
of
Purposes
of
Non­
cooling
Water
Intakes
(
e.
g.,
fire
water,
hotel
loads)
Watermaker,
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
2.5
million
gal
(
20,000
kips)
6­
10
hours,
see
above
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
The
rigs
do
not
carry
much
ballast
water
from
location
to
location;
it
is
generally
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
Strainers
Is
the
Rig
equipped
with
a
Radiator
Cooling
System
for
the
Main
Engines?
Radiator
closed
loop
cooling
system