US2918032A - Tanker bulkhead and compartment construction - Google Patents

Description

TANKER BULKHEAD AND COMPARTMENT CONSTRUCTION Filed July 23, 1957 Dec. '22, 1959 D. F. M 'NAUGHT 3 Sheets-Sheet 1 INVENTOR Dona/0 f: Mac/Vqgybz lillili kll! BY mm W.

ATTORNEY D. F. M NAUGHT 2,918,032

TANKER BULKHEAD AND COMPARTMENT CONSTRUCTION Dec. 22, 1959 3 Sheets-Sheet 3 Filed July 23, 1957 INVENTOR Dona/o E Mac/V0096! BY W M12 W.

ATTORNEY TANKER BULKHEADAND COMPARTMYENT CONSTRUCTION This invention relates generally to the construction of United States Patent vesse l s for the transportation in bulk of liquid cargo,

and,' specifically, to a novel manner of supporting the vessels transverse web frames. ff

It has long been the practice to build tankers with several liquid-tight transverse bulkheads and with one or more liquid-tight longitudinal bulkheads, thus subdividing the vessel into a number ofv liquid-tight storage compartments and, further, to provide open transverse Web frames between the transverse bulkheads. Such construction is shown, for example, in U.S Patent No. 1,029,546 to Isherwood. As tanker sizes increased, it became customary to increase the depth of the web of the transverse frames, and to stiffen these transverse web frames with struts as shown for example in U.S. Patent 2,218,688 to Stewart.

For several reasons, it has become economically at tractive to construct tankers of enormous capacities,

ranging from about 65,000 tons to over 100,000 tons.

In vessels of such size, it is most important to reduce the cost of construction as much as is strength and seaworthiness.

In these huge tankers, more appropriately termed super-tankers, there may be several transverse web frames between any two transverse bulkheads. I,have

consistent with jinven ted-a manner of construction wherein those transverse web frames adjacent the transverse bulkheads are supported by horizontal webs secured to the transverse bulkheads, thereby eliminating any need to incorporate struts into these transverse web frames and, at the same time, I am able to reduce the scantlings of these transverse web frames.

Accordingly, one of the objects of my invention is to support those transverse web frames adjacent a transverse bulkhead by means of horizontal webs secured tosaid transverse bulkhead. 1

Another object of my invention is to eliminate the use of struts in those transverseweb frames adjacent. a transverse bulkhead.

A further object of my invention is to reduce the scantlings of those transverse web frames adjacent a transverse bulkhead without sacrificing strength or seaworthiness.

Yet another object of my invention is to make more eflicient use of steel in the construction of these huge tankers.

Other objects and advantages of my invention will become apparent during the course of the following description and by reference to the accompanying draw ings, in which like numerals represent like parts in the several views.

Fig. 1 represents a partial plan view of a typical tanker constructed in accordance with my invention. This view is taken below the deck,from the shell of the vessel to its centerline. It will be understood that, as the ves-' sel is generally symmetrical about its centerline, the half of the vessel not shown is similar to the half shown in this view. Fig. 1 shows a transverse bulkhead and 688 to Stewart.

r 2,918,032 Fatented Dec. 22, 1959 i the two adjacent transverse web frames, one on either and the horizontal webs'secured thereto.

Fig. '3 represents a section in elevation, takenalong the line 33 of Fig. 1, showing a transverse web frame and the horizontal webs secured thereto.

.'Fig. 4' represents a section in elevation, taken along the line 4'4 of Fig. 1, showing another view of the transverse bulkhead, and the horizontal webs secured thereto.

Fig.1 5 represents an enlarged section in plan, taken along the line 55 ofFig. 3, showing a support bracket secured to the transverseweb frame and to the adjacent structure, at a location between two of the horizontal webs.

, A' typical vessel built for the transportation iii bulk of liquid cargo (e.g., oil) may comprise a number of liquid-tight transverse bulkheads 1, a number of liquid- 'tight longitudinal bulkheads 2, a deck'3, and a shell comprising bottom plating 4 and side 'plating' 5. Thus, the hull ofthe vessel has been subdividedinto a number of -liquidtight bulk cargo compartments 6. For purposes of clarity, only one set of transverse bulkheads 1 and only one longitudinal bulkhead 2 have'been shown. The

-vessel illustrated in the foregoing drawings is framed after the well-known'longitudinal system, as shown,

' for example, in U.S. Patent No; 1,029,546 to Isherwood,

stifieners 9 are secured to transverse bulkhead 1. 'Support brackets 10 are secured to transverse web frames 8 and to those longitudinals 7 passing through transverse web frames 8.

It will be understood that there may be several transverse web frames 8 between any two transverse bulkheads 1. those transverse web frames 8 adjacent a transverse bulkhead 1 are supported from the transverse bulkhead 1 by anumber of vertically spaced horizontal webs 11. Those transverse web frames not adjacent a transverse bulkhead 1 may be stiffened in the customary manner by struts as shown, for example, in U.S. Patent No. 2,218,-

As these last-mentioned transverse web frames are not associated with my invention, they have been omitted, for purposes of brevity, from the drawings. The drawings show a typical transverse bulkhead 1 with horizontal webs 11 secured to both sides of the bulkhead, each horizontal web 11 extending out to its respective transverse web frame 8. In order to obtain a balanced design, whereby the properties of horizontal webs 11 are effective for resistance to hydrostatic loading on transverse bulkhead 1 and are, in addition, suitable to provide support for the transverse web frames 8, I prefer to dispose and proportion the horizontal webs 11 substantially symmetrically about transverse bulkhead 1, as shown in Figs. 1 and 4.

Horizontal webs 11 are provided with splayed or fiared portions 12. These splayed portions 12, which may be separate pieces secured to horizontal webs 11 or which may be formed integral with horizontal webs 11, extend to and are fitted and secured to transverse web frames 8. Depending upon the particular bay of cargo compartments 6 under consideration (inboard or outboard), these In a vessel built according to my invention,

splayed portions 12 may also be secured, as will be evident upon inspection of the drawings, to side plating 5 or to longitudinal bulkhead 2.

Stiffeners 13,are secured to vertical stitfeners 9 and to horizontal ,webs 11 and flared portions 12. ,Face ,plates 14 are also secured ,to horizontal webs 1 11 and t flared portions 12. 7

Brackets 15are secured to transverse ,Web frames 8, at regions thereon opposite the regions of attachment of splayed portions 12, to longitudinals 7, ,and to side plating or longitudinal bulkhead 2 as will be evident from Fig. 1. V

construction methods. Ina supertankerofsome 1Q0,QOG t o n s;capacity, there maybe 15 tanks. Thus, in the construction of such a vessel, a.- saving ofapproximately 375 tons of steelcan be realized.

' ,It,will be appreciated that, although five sets of tiers of horizontal. webs 11 are shown in the accompanying drawings, the actual number of horizontal webs 11 in any particular vessel will depend upon the dimensions of the vessel and its component parts insofar as'they relate to cargo compartments 6.

Although I have shown and described my invention in, some detail, I do ,not wishto be limited totheexact arrangement shown and described, but may use such substitutions, modifications or equivalents thereof as are embraced within the scope of my invention or as pointed out in the claims.

I claim:

' 1. In a vessel provided with a. deck, bottom ,plating,

side plating,a first bulkhead arranged substantially parallel .to the side plat ng, a second bulkhead intersecting the side plating and first bulkhead, and first and second 4 a web frames arranged substantially parallel to and on opposite sides of'the second bulkhead and intersecting the side plating and first bulkhead and extending from the deck to the bottom plating, supporting construction for the first and second web frames and for said second bulkhead comprising a plurality of vertically spaced horizontally disposed first web members secured to the second bulkhead, first portions son said first vWeb members secured to said first 'web frame'in the vicinity of the side plating, second portions on said first Web members secured to .said first .web frame .in the vicinity of the first bulkhead, a plurality of vertically spaced horizontally disposed second web members secured to the second bulkhead, third portions on said second web members secured to said second web framein the vicinity of the side plating, and fourth portions on said second web members secured to said second web frame in the vicinity of the first bulkhead said first and second, andthird and fourth portions being in effective supporting relationship with said first and second-web frames respectively at a plurality of points intermediate .the deck and bottom plating, whereby the verticalspans and scantlingsof said first and second web framesare red uced.

s r n c t ti n a in a m 1 sa d fir web members being disposed substantially symmetrically with respect to saidsecond web members aboutsaid -second bulkhead. I I i 3, Supporting construction as inclaim 1, ;f urthe r;i neluding first and third bracket members securedto-the side platingand respectively to the first and second web frames at regions substantially opposite .the regions of attachment of said first andthird portions to said first and second web frames respectively, and secondand fourth bracket members secured tothe first bulkhead andrrespectively to the first and second web frames at regions substantially opposite the regions of attachment of said second and fourth portions to said first ,and second web frames respectively.

References Cited in the file of thispatent UNITED STATES PATENTS 1,029,546 Isherwood June 11, 1912 1,357,699 Gatewood .-Nov. ,2, 1920 2,741,208 Albiach Apr. 10, 1956

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