Cooling
Water
Intake
Structure
(
CWIS)
Information
Data
Required
Rig
Information
Rig
Name
NABORS
BR­
11
NABORS
BR­
12
Rig
Type
Inland
barge
workover
rig
Total
Installed
Power
Generation
Capacity
AC
generators
only
(
power
rig)
 
Not
reported
Number
of
Cooling
Water
Intake
Structures
(
CWISs)
2
Brief
description
of
each
CWIS
(
e.
g.,
sea
chest,
simple
pipe)
Simple
suction
pipe
with
footvalve
Rough
dimensions
of
each
CWIS
and
indicate
whether
onboard
CWIS
has
an
existing
flange
1'
X6"
Footvalve
with
8"
x4"
suction
hose:
Has
onboard
flange
Screen
type
(
e.
g.,
strainer,
wedge
wire)
with
mesh
size
Footvalve
Total
Design
Specifications
for
Daily
Maximum
Water
Intake
Volume
of
each
CWIS
1,088,640
gals
(
25,920
bbls)
Total
Daily
Water
Intake
Volume
of
each
CWIS
(
Set­
up/
Drilling)
1,088,640
gals
(
25,920
bbls)
Design
Specs
for
Through
Screen
Velocity
of
each
CWIS
(
i.
e.,
Q=
V*
A)
(
Set­
up/
Drilling)
2.0
fps
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)
Drill
water,
fire
main,
ballast,
sanitary,
mud
pit
supply
Total
Volume
of
Water
Intake
for
Ballasting,
Duration
of
the
Ballast
intake,
and
the
Through
Screen
Velocity
of
the
Ballast
intake
504,714
gals
(
12,017
bbls)
Duration
=
time
on
location.
Through
Screen
Velocity
=
29.5
fps
Mitigation
Measures
for
reducing
Exotic
Species
Migration
through
Ballast
water
The
rig
does
not
carry
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
chest
screens
Is
the
Rig
equipped
with
a
Radiator
Cooling
System
for
the
Main
Engines?
Yes
