Document ID: EPA-HQ-OW-2004-0002-0521
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
Homer
Ferrington
Rig
Type
Semisubmersible
Total
Installed
Power
Generation
Capacity
10,000HP
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
2
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
2
seachests
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
36"
diameter
plate
w/
241
­
1
 
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
1,008,000
gals
(
24,000
bbls)

Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
1,008,000
gals
(
24,000
bbls)

Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
3.2
ft.
per
second
List
of
Purposes
of
Cooling
Water
Intakes
(
e.
g.,
cool
crude
oil,
produced
water,
power
generators,
drill
pipe
brakes)
Winch
cooling,
Brake
Water
Cooling,
High
Pressure
Unit,
Compressors
List
of
Purposes
of
Non­
cooling
Water
Intakes
(
e.
g.,
fire
water,
hotel
loads)
Fire
pump,
Sanitary,
Ballast
Water,
Watermakers,
Mud
pits.

Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
2,675,358
gal
(
63,699
bbls)
Ballast
Water
Thru
screen
velocity
=
26.0
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
screens,
duplex
and
simplex
baxkets,
low
voltage
impressed
current
cathodic
protection.

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