Cooling
Water
Intake
Structure
(
CWIS)
Information
Data
Required
Rig
Information
Rig
Name
Noble
Johnnie
Hoffman
Rig
Type
Jackup
Total
Installed
Power
Generation
Capacity
5,850
HP
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
4
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
3
Deep
Well
Towers
1
Sea
Chest
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
12"
Deep
Well;
Flanged
at
tower
top
10"
Sea
Chest;
No
Flange
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
None
Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
1,364,454
gals
(
34,287
bbls)

Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
1,364,454
gals
(
34,287
bbls)

Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
Deep
Well
=
1.0
ft.
per
second
Sea
Chest
=
10.2
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,
CMT
unit
Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
1,366,672
gal
(
31,816
bbls)
Ballast
Water
(
preload)
on
board
approx.
6
hours.
Thru
screen
velocity
=
1.0
fps
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
Ballast
water
not
transported.
It
is
taken
on
and
dumped
from
the
same
location.
Mitigation
Measures
for
reducing
Impingement
and
Entrainment
of
Aquatic
Organisms,
as
well
as
Bio­
fouling
Prevention
Measures
Cover
over
sea
chest,
cathodic
protection.

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