Document ID: EPA-HQ-OW-2004-0002-0525
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
Noble
Lester
Pettus
Noble
Joe
Alford
Rig
Type
Submersible
Total
Installed
Power
Generation
Capacity
Approx.
3,600HP
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
4
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
2
sets
of
seachests,
one
high
and
one
low.
Only
one
set
used
at
a
time.
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
24diameter
pipe
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
Bar
grating
Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
1,728,216
gals
(
41,148bbls)

Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
1,728,216
gals
(
41,148bbls)

Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
12.5
ft.
per
second
List
of
Purposes
of
Cooling
Water
Intakes
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes)
Brake
Water
Cooling
List
of
Purposes
of
Non­
cooling
Water
Intakes
(
e.
g.,
fire
water,
hotel
loads)
Fire
pump,
Sanitary,
Ballast
Water
Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
2,727,270
gal
(
64,934
bbls)
Ballast
Water
Thru
screen
velocity
=
12.5
fps
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
Majority
of
ballast
water
taken
on
and
discharged
in
same
location.
Mitigation
Measures
for
reducing
Impingement
and
Entrainment
of
Aquatic
Organisms,
as
well
as
Bio­
fouling
Prevention
Measures
Seachests
covered
by
bars.

Is
the
Rig
equipped
with
a
Radiator
Cooling
System
for
the
Main
Engines?
Yes