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Hull Specification for RMS. Britannic c. 1912
SECTION  “B” Paragraphs 1 - 10
Hull & Scantlings

Pages 14 - 17

This page under construction

Transcribed from the original manuscript by Bill Sauder.

This transcription © 1985-2009 Bill Sauder

Contract Text

Section B - Paragraphs 1 to 10 - Hull Specifications

 

Annotations

1. Stem.  Of rolled steel bars scarphed together in convenient lengths.  To be connected to the keel by suitable steel casting.

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2. Sternpost.  To be of Cast steel with aperture and to be securely fastened to the structure of the ship; five gudgeons to be fitted.  To be in two pieces efficiently scarphed & riveted.
 
3. Rudder.  To be of Cast steel, the portion below the stock being in four pieces, with flanged joints keyed and bolted together.  The coupling keys all to be machined out of the solid [sic] on the tops of the bottom pieces and planed and fitted into grooves on the bottoms of the top part corresponding adjacent pieces.  The bolts all to be turned and fitted and to screw up on the under side of the bottom flanges of the couplings; the bolts to be of forged steel.  Two double rudder stops to be cast on in approved positions.  The stock to be of forged steel.  The rudder to have five gudgeons.  The rudder pintles to be of nickel steel let into rudder gudgeons with a taper and fastened with C.S. close nut on the top side; each nut to have a small locking screw.  The sides of the pintles in the sternpost gudgeons to be parallel and the bottoms to be conical points bearing on the nickel steel steps in the bottom of the gudgeon.  The weight of the rudder to be taken up by all the pintles.  Drainage holes to be arranged in the nickel steps.  The top pintle to ship into a hole in the rudder stock and to be fastened by a pin through the stock and pintle.  The rudder stops to be arranged so that the rudder is hard over at 40° with the centre line.
 

4. Propeller Brackets.  To be separate steel castings to carry the wing propeller shafts, and to be properly joined at the centre line by turned and fitted bolts.  The castings to be efficiently secured to the foot of the stern frame and to the structure of the ship.  Zinc plates to be fitted to the arms of the brackets.

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Smaller cast steel Boss brackets to be also fitted in way of the boss plating, about 16 ft. forward of the main brackets; to be separate castings securely bolted together at the centre line and efficiently attached to the structure of the ship.

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5. Keel. To be of flat plate type with flat rubbing bar 19½” x 3”.
6. Bilge Keels.  To consist of plates 25” deep attached to the shell by means of double angles, one 9” x 4” and the other 4” x 4” flanges.  The plate to be stiffened on its outer edge on the under side by 3” x 1¼” solid cope iron.  A doubling plate 12” wide to be fitted on the upper side of the deep plate.  Bilge keels to extend for about 294 ft. amidships.

7. Shell.  The shell plating to be in as long lengths as possible and to be lapped and strapped as may be required in the Builder’s usual style.  Tapered straps strips to be fitted to the inside strakes below the hawse pipes.  The plating to extend round the boss castings for propellers in accordance with Builders’ practice for triple screw vessels.  Doublings to be fitted over all doors in the ship’s side and carried well down past the corners; doubling also to be fitted between the groups of double tiered sidelights in way of 1st and 2nd class accommodation on the Saloon Deck, as may be found practicable.  Special attention to be given to the strengthening of the topsides in way of the Shelter and Bridge Decks and at the break of the Bridge at the fore end.  The inside plates to be double in way of the hawse pipes, and small doublings fitted as required in was of all machinery discharge openings, &c.

Inner Skin.  An inner skin to be fitted from f78 forward to f71 aft in way of Boiler and Engine rooms, extending in height from the tank top to 3’6” above Middle Deck; the plating to have lapped edges and butts and to be joggled.  The skin to be connected to the main shell by five longitudinals, the third or centre one of these being

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watertight; and to be bracketed at the bottom to the tank top and main frames, and connected to the tank, on the inboard side, by a fore and aft foundation bar.  The Upper edge of the skin to be connected to the shell plating by a continuous fore and aft shelf plate.  The skin to be supported on channels connected to the main frames by brackets

8. Mouldings.  Stern to have double knuckle with the usual mouldings. Cope iron moulding to be fitted in way of Poop and Forecastle, also inside the bulwark in the well on Shelter Deck.  Moulding of flat section to be fitted at bulwark level outside, extending from the midship ends of the wells on the Shelter Deck right forward and aft respectively.
9. Doors in Shell.  42 Coaling doors (21 P & 21 S) to be fitted between the Middle and Upper Decks; these doors to be of the Cast steel flush type fastened by hinged dog at the back with single bolt passing through the centre of the door; the clear opening of the door to be 2’0” x 1’9”.  The following doors also to be arranged:-
Doors to be secured by means of strong backs and turn buckles as may be required to make a thoroughly strong and water-tight job.  The outsides of the doors to be made flush with the shell plating by means of doublings where necessary.

10. Cargo Ports [No Entry under this heading]

C.S.: Cast Steel.

Note: The location and description of Shell Doors for Britannic is similar but not identical to those on Titanic.  During the sinking of the Titanic, a few shell doors were opened with a view to help evacuating the ship, and this difference will need to be addressed later.

 

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Copyright © 2009 Bill Sauder v 10/09.1