Document ID: EPA-HQ-OW-2004-0002-0045
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-11-23T05:00Z

March
12,
2004
Page
1
of
7
Appendix
A
Protruding
Fine
Mesh
Screen
Modification
Section
through
Sea
Chest
Opening
to
the
Ocean
Protruding
Fine
Mesh
Sea
Water
Intake
March
12,
2004
Page
2
of
7
Detail
Item
1:
Outer
Bar
Screen
March
12,
2004
Page
3
of
7
Detail
Item
2:
Fine
Mesh
Inner
Screen
Detail
Item
3:
Fine
Mesh
Frame
and
Inner
Diffuser
Detail
Item
4:
Protruding
Main
Frame
March
12,
2004
Page
4
of
7
Appendix
B
Horizontal
Flow
Modifier
Plan
View
of
Bottom
Sea
Chest
Horizontal
Flow
Modifier
Note:
This
modification
is
for
use
on
sea
chests
that
are
located
on
the
bottom
of
the
vessel
and
no
more
than
30
°
of
the
horizontal.
Flow
Modifier
Plate
March
12,
2004
Page
5
of
7
Section
YY
through
Horizontal
Flow
Modifier
Notes:
1.
The
basic
assembly
consists
of
a
flow
modifier
plate
that
is
stiffened
using
4"
flat
bar
welded
to
the
under
side.
These
flat
bar
stiffeners
also
assists
in
funnelling
the
flow
into
the
existing
intake
structure.
2.
A
coarse
mesh
has
been
included
around
the
perimeter
of
the
new
intake
structure.
This
is
to
prevent
larger
animals
(
like
turtles)
getting
trapped
in
the
gap
between
the
hull
and
the
flow
modifier
plate
(
looks
similar
to
a
reef
ledge
to
some
animals).
3.
8
brackets
(
4"
PFC)
are
permanently
welded
to
the
hull
as
the
primary
attachment
points.
4.
8
legs
off
the
flow
modifier
plate
(
1/
2"
plate)
attach
to
the
brackets
on
the
hull.
3
of
the
bracket
to
leg
connections
use
hinge
pins,
the
other
5
legs
use
bolts.
Releasing
the
bolts
allows
the
flow
modifier
to
swing
down
for
maintenance
or
cleaning
of
the
sea
chest
intake.
A
lifting
lug
should
be
added
to
the
hull
to
allow
lifting
equipment
can
be
used
to
safely
open
and
close
this
new
structure.
A
lifting
lug
has
been
incorporated
in
the
costs
for
this
item.
5.
All
materials
used
for
the
construction
of
this
item
will
be
mild
steel
coated
in
anti­
fouling
paint.
Flow
Modifier
Plate
March
12,
2004
Page
6
of
7
Plan
View
of
Side
Sea
Chest
Horizontal
Flow
Modifier
Note:
This
modification
is
for
use
on
sea
chests
that
are
located
on
the
side
of
the
vessel
at
angles
greater
than
30
°
of
the
horizontal.
The
direction
of
the
flow
louvres
should
be
adjusted
during
the
design
and
construction
of
this
equipment
such
that
they
are
horizontal
Flow
Louvres
March
12,
2004
Page
7
of
7
Notes:
1
The
basic
assembly
consists
of
a
diffuser
plate
nested
in
a
number
of
flow
louvres.
The
diffuser
ensures
that
the
flow
is
evenly
distributed
across
the
louvres
and
the
louvres
ensure
that
the
flow
is
horizontal
at
a
velocity
of
0.5
ft/
sec
or
less.
2
2
brackets
(
2"
equal
angles)
are
permanently
welded
to
the
hull
as
the
primary
attachment
points.
These
run
the
entire
width
and
at
each
end
of
the
sea
chest
modification.
3
The
horizontal
flow
modifier
is
attached
to
the
brackets
on
the
hull
by
way
of
a
hinge
on
one
side
and
bolts
on
the
other.
By
releasing
the
bolts,
the
horizontal
flow
modifier
may
be
swung
out
away
from
the
hull
for
access
to
the
existing
sea
chest.
4
All
materials
used
for
the
construction
of
this
item
will
be
mild
steel
coated
in
anti­
fouling
paint.
Flow
Louvres