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~ Jan. 7, 1947.
y
H_ p_ FREAR
2,413,821
SHIP CONSTRUCTION
Filed July 9, 1940
m i/
2 Sheets-Sheet 2
2,413,821
Patented Jan. 7, 1947
UNITED STATES PATENT OFFICE
2,413,821
SHIP CONSTRUCTION
Hugo P. Frear, Manhasset, N. Y., assigner to
Bethlehem Steel Company, a corporation o1'
Pennsylvania
Application July 9, 1940, Serial N0. 344,549
6 Claims.
(Cl. 114-79)
1
* 2
My invention relates to improvements in the
structure of fioating vessels or ships of all types, `>
but more especially to vessels designed to carry
liquid cargo in bulk, commonly called tankers.
tance from said longitudinal bulkhead to the
nearest said web support is less than the distance
between the said web supports. I also provide
for an improvement in the stiffening structure
In vessels of the type referred to it is common
of the outer transverse walls formed between a
to have bottom, side, and deck plating, with a
series of tanks formed therewithin by the inter
section of water~tight transverse and longitudi
longitudinal wall and its adjacent ship’s side plat
ing. Here I provide horizontal fluted stifieners
having their inner ends extending to the inner
nal walls or bulkheads.
vertical edge of said outer transverse wall and
being welded to and supported by the welding
bar or plate at this line of juncture, while the
Such a vessel was dis»
closed in my previous application Serial No.
107,584, which application issued as Patent No.
2,092,504, of September '7, 1937. In my said prior
application I disclosed an improved design of
ship construction with respect to the reenforcing
or stiiîening of the said transverse and longitudi
nal walls or bulkheads.
outer ends thereof are supported in the manner
of my prior application, wherein they jut beyond
a vertical supporting girder but are substantially
15 short of the ship’s side plating.
This improved design
It is therefore a particular object of this, my
present application, to provide an improved struc~
ing means for said walls which comprised the
tural design wherein the intersecting walls form
use of a troughed or ñuted plate, rolled, pressed,
ing the transverse and longitudinal bulkheads of
or otherwise formed, having an open face coin 20 tankers and the like are welded to and supported
cident with, or substantially so, the normal plane
by a welding bar or plate placed along the verti~
of a said wall, as its plating. A particular fea
cal line of juncture of said bulkheads.
was more particularly drawn to a form of stilfen-v
ture of my prior invention was in having a struc
' It is also an object of my invention to form
ture supporting an area by means of spaced gird»
the walls forming the transverse and longitudinal
ers supported at their ends by two oppositely dis 25 bulkheads of fluted plates that differ from simi
posed boundary walls, and a plurality of fluted
stiñ’eners supported by said girders transversely
thereto having their ends jutting beyond their
respective points of support on their adjacent
girder but substantially short of the boundary
wall to which they are individually longitudinally
opposed.
lar plates in my prior application in that the
flutes extend to the edges thereof and the edges
are welded to and supported by vertical welding _
bars or plates placed along the line of juncture
of said transverse and longitudinal bulkheads.
It is a further object of my invention, in cer
tain wall structures, such as an outer transverse
bulkhead between a longitudinal wall or bulkhead
My present invention embodies an improve
ment in the detail structure along the line of
and the ship’s adjacent side plating, to combine
juncture of said fiuted walls, and in a modiñca 35 certain features of my prior application with those
tion to the design of said ñuted walls. Along the
of my present application, wherein the said outer
line of juncture of said walls I provide an inde
transverse bulkhead is stiffened by horizontal
pendent welding bar or welding plate to which I
fluted stifîeners having their inner ends extend~
weld the edges of the walls, and I also extend
ing to the inner vertical edge thereof and being
my fluted stiffeners to said edges so that the ends 40 Welded to and supported by the welding bar or
thereof may be welded to said Welding bar or
plate at this line of juncture, while the outer
welding plate. I also especially provide in my
ends thereof are supported in the manner of my
preferred arrangement (Fig. 6) that the edges of
prior application, wherein they jut beyond a
said welding bar project laterally of said longi
tudinal wall constituting a support for the ñute 45 vertical supporting girder but are substantially
short of the ship’s side plating.
ends and edges of said transverse walls. This
The rnovel features will be more fully under
arrangement not only permits the edges of said
stood from the following description and claims
transverse walls toV overlap said welding bar to
taken with the drawings, in which:
which they are Welded, but, most important of all,
Figure l represents diagrammatically a trans
provides the means whereby I extend the edges 50
verse section through a tanker embodying my
and iiute ends of said middle transverse bulk
invention;
,
head to the said line of juncture and weld them
Figure 2 is a cross section taken along the line
to the said longitudinal wall. In association with
2--2 of Figure 1 showing a series of tanks‘formed
the aforesaid detail, I space the web supports to
said middle transverse bulkhead so that the dis~V 5 il by vintersecting walls:
-
2,413,821»
5
a welding bar, or plate 40' considerably wider
than the overall depth of the flutes of the longi
Itudinal bulkheads. In this arrangement I use
ñuted transverse bulkheads I6”' or I1"’, and
I8”’ similar to but shorter than the fluted trans
verse bulkheads I6 or I1, and I8 of Figure 1 and
2, and which in a like manner have the closed
that various modifications are possible within the
scope ofthe invention claimed.
'
Having thus described my invention what I
claim as new and desire to secure by Letters
Patent is:
1. In a tank structure having a series of water
tight compartments therewithin, exterior Walls
tapered ends 29’ and 33’ of said flutes terminating
comprised of top, bottom, and side plating, and
substantially coincidental with the normal planes
interior boundary walls forming said compart
of the plates 21’ and 3|’ at their edges 38” and 10 ments, certain of said boundary walls each com- ‘
34", respectively, with the result that the said
prising a plate having functionally integral
closed ends are substantially short of the adja
therewith a plurality of horizontal relatively
cent longitudinal bulkhead to which they are
narrow ?luted recessed portions, said recessed
directly opposed.
portions being of uniform cross section through
For supporting the ñuted transverse and the
out a substantial portion of their length and ta»
ñuted longitudinal bulkheads additionally to their
pering in depth at the ends thereof to be sub~
respective boundary walls, I provide beams or
stantially coincidental with the plane of said
girders as disclosed in my hereinabove mentioned
plate at interior vertical edges thereof, and an
unflanged bar fixed at each interior vertical
longitudinal bulkhead I4 is attached to and sup 20 corner juncture of said compartments, the said
ported by the girders 45. Transverse :middle
bar being welded water-tight to each adjacent
prior application No. 107,584. For example.
bulkhead I8 is attached to and supported by the
girders 46, 41 and 48. Transverse wing bulkhead
I6 has the girder 49 to which it is attached and
by which it is supported. In eah case, the girder-s
45, 46, 41, 48, and 49 are attached at their upper
and lower ends to the ship’s deck and bottom
plating, respectively. In Figures 1, 2, 3, 4, and 5 I
show the preferred spacing of said web supports
tight compartments therewithin, exterior walls
comprised of top, bottom, and side plating, and
interior boundary walls forming said compart
ments, certain co-planar ones of said boundary
walls each comprising a plate having functionally
or 48. This spacing is approximately determined
substantially coincidental with the plane of said
one of said vertical edges.
-
2. In a tank structure having a series of water
integral therewith a plurality of horizontal rela
for the middle transverse bulkhead, or wall I8, 30 tively narrow flutedrecessed portions, said re
cessed portions being of uniform cross section
herein ñrst referred to. I space the longitudinal
throughout a substantial portion of their length
walls I4 and I5 closer to the nearest Web supports
and tapering in depthV at the ends thereof to be
46 and 48 than web support 41 is to either 46
plate at interior vertical edges thereof, other co
planar ones of said boundary walls extending
transversely of said first mentioned co-planar
walls each comprising a plate having functionally
integral therewith a plurality of horizontal rela~
6 extended to within welding distance along the 40 tively narrow fluted recessed portions extending
in uniform cross-section to the vertical edges of
said line of juncture. I also show in Figures 2
said plate, and an unilanged juncture plate fixed
and 6 the edges 42 of said welding bar designed
at each interior vertical corner juncture of said
to form laterally projecting support brackets for
' compartments, the edges _of said juncture plate
said wall edges.
From the foregoing description it will now bek 45 being welded water-tight to its adjacent one of
said vertical edges of the first mentioned co
readily recognized by those skilled in the art that
planar boundary walls and the faces of said
I have a novel method of shi-p construction which
juncture plate being welded water-tight to its
is particularly economical of weight without any
sacrifice in efficiency or strength. I have shown 50 ' adjacent one of said vertical edgesof the second
mentioned co-planar boundary walls.
and described a variety of arrangements for the
by making the area of said bulkhead or wall
between supports 46 and 48 55% or more of
the total area of said wall between said longi
tudinal walls I4 and I5. I also show the edges
of said middle transverse wall I 8 in Figures 2 and
3. In a tank structure having a series of water
water-tight juncture of the lines of intersection
tight compartments therewithin, exterior wallsl
of the transverse and longitudinal fluted bulk
comprised of top, bottom, and side plating, and
heads within the vessel, but each arrangement
interior
boundary walls forming said compart
has been characterized by awelding bar, or plate, 55
ments, certain of said boundary-walls each com
to which the adjacent vertical edges of the bulk
prising a plate having functionally integral
Iheads are welded; while the fluted bulkheads,
therewith a plurality of horizontal relatively
both transverse and longitudinal, have been char
narrow fluted- recessed portions, said recessed
acterized by having the flutes thereof extend to
portions being of uniform cross section through
the very edges of the bulkheads that are welded 60 out a substantial portion of their length and ta
to said welding bar. Also, the said flutes in each
pering in depth at the ends thereof to be sub
case are characterized by structure whereby it
stantially coincidental with the plane of said
enters into the main plating of the bulkhead as
plate at interior vertical edges thereof, and an
a functionally integral element thereof.
unflanged bar fixed at each interior vertical
I do not wish it to be understood that my 65 corner juncture of said compartments, the said
above described methods are limited in their ap
bar being welded water-tight to each adjacent
plication to vessels of the type described and it is
one of said vertical edges, and each of said in
manifest that the principle of design herein set
terior boundary walls being supported by a ver
forth could be utilized with other well known
tically ldisposed Web »attached at its ends to said
types of ship construction.
The terms and expressions which I have em
ployed are used as terms of description and not
of limitation as I have no intention, in the use of
70
top and bottom plating respectively.
4. In a tank structure having a series of water
tight compartments therewithin, exterior walls
comprised of top, bottom, and side plating, and
such terms and expressions, of excluding any
~interior boundary walls forming said compart
equivalents of the features thereof, but recognize 75 ments, certain co-planar ones of said boundary
2,413,821
walls each comprising a plate having function
ally integral therewith a plurality of horizontal
relatively narrow Iiuted recessed portions, _Said
recessed portions being of uniform cross sec
tion throughout a substantial portionof their
iength and tapering in depth at the ends thereof to be substantially coincidental with the plane
of said plate at interior vertical edges thereof,
8
tionally integral therewith Va plurality of hori
zontal relatively Vnarrow »parallel closed end
i'iuted recessed portions transverse `to vand sup
portedat points `on said web, alltheends of _said
ñuted recessed portions extending beyond rtheir
points of support ,on said web toward said side
plating and substantially short thereof and all
the ends opposite Vthereto ‘extending to theinner
vertical -edge of said plate, and anvuniianged bar
other co-»planar ones of said boundary walls eX~
tending transversely of said first mentioned co lu fixedat each interior" vertical corner juncture
planar walls each comprising a plate having
functionally integral therewith a plurality of
ci said compartments, the said vinner vertical
edge of said recessed vplate being Welded water
horizontal relatively narrow Íluted recessed por
tions extending in uniform crossmsection to the
tight to a said bar.
6.111 a tank structure having ya series of
plating respectively.
flut-ed _recessed kportdrms Yextending beyond their
vertical edges of said plate, andan unñanged 1,5 water-,tight >compartments therewithin, exterior
walls comprised of top, bottonnand side plating,
juncture plate fixed at each interior vertical
and interior boundary Walls forming said com~
corner juncture of said compartments, the edges
-partinents, one of said interior boundary Walls
of said juncture plate being welded water-tight
being normal -to and in Contact with said side
to its adjacent one of said vertical edges of the
plating, a web supported at its ends by .said top
iirst mentioned co-planar boundary walls and
and bottom plating, the said one of said interi r
the faces of said juncture plate being weided
boundary Walls comprising a plate >leaving func»
water-tight to its adjacent one of said vertical
tionally integral therewith a plurality of hori
edges of the second mentioned co-planar bound
zcntal relatively narrow parallel closed end
ary walis, and each of said interior boundary
walls being supported by a vertically disposed ¿5 fiuted recessed portions transverse to and sup
ported at points on said web, all the ends of said
web attached at its ends to said top and bottom
watertight compartments therewithin, exterior
walls comprised of top, bottom, and side plating,
points oi support Yon lsaid web toward Vsaid side
plating and substantailly short thereof and all
u ends oppositethereto extending to the inner
and interior boundary walls forming said corn
partments, one of said interior boundary walls
being normal to and in Contact with said side
plating, a web supported at its ends by said top
and bottom plating, the said one of said interior 35
boundary walls comprising a plate having func~
juncture plate fixed at each interior vertical
corner juncture of said compartments, the said
inner vertical edge of said recessed plate beingv
welded watentight to a said juncture plate.
HUGO P. FREAR.
5. In a tank structure having a series of
.
cal edge of said plate, and an Vunilanged
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