Machinery Lay-out

Machinery Lay-out
Codes of color explanation
Fuel bunkers (diesel oil) Main fuel bunkers (heating oil) Main fuel overflow bunkers
Port diesel motor room Port shaft tunnel Centre shaft alley
Starboard shaft tunnel Starboard diesel motor room Electric plant No 2
Centre turbine room Electric plant No 1 Electric switch gear room No 2
Port shaft alley After A.A. and damage control room Starboard shaft alley
Electric switch gear room No 1 Port turbine room Starboard turbine room
Control platform boiler room Port No 1 boiler room Centre No 1 boiler room
Starboard No 1 boiler room Boiler auxiliary machinery room Port No 2 boiler room
Centre No 2 boiler room Starboard No 2 boiler room Electric plant No 4
Auxiliary machinery room Electric plant No 3  

3 sets geared turbines (Curtis type) with single reduction: in three turbine rooms
(Bismarck: Blohm & Voss, Hamburg; Tirpitz: Brown, Boveri & Cie).
Turbine sets in four housings, turbines/propellers rpm:
High-pressure (HP) turbine 2,880/270
Intermediate-pressure (IP) turbine 2,880/270
Low-pressure (LP) turbine 2,430/190
High-pressure astern turbine 2,025/180
Low-pressure astern turbine 1,715/190
Cruising turbine 4,220/270
The HP astern turbine was contained with the IP ahead drum, the LP ahead and astern turbines were grouped together.*
Performance weight of entire drive 20.3 kg/hp
Main drive Three shafts with three-bladed propellers 4.7 m in diameter
Steering assembly Two balanced-type rudders with 8° divergence towards centreline
*There are a number of differently constructed types of turbine for differing applications, viz. the Parsons multi-stage reaction turbine; the Laval impulse turbine with one pressure and one velocity stage; the Curtis velocity-compounded impulse turbine with one pressure stage and multi-velocity stages; and the Zoelly impulse turbine with multi-pressure stages, basically similar in construction to the Curtis. Shipyards or other manufactures supplying turbines did so mainly under license.

In Bismarck the individual turbine sets were grouped round the gearing. The HP reaction turbine was a Curtis wheel with 40 stages, the IP a double-flow 14 stage reaction turbine and the LP a 9 stage reaction turbine supporting the condenser slung below it, as was customary. The HP astern turbine was a single Curtis wheel, the LP astern turbine was of the divided double-flow type. No cruising turbine was fitted.

In Tirpitz the individual turbines were similar to those of the Bismarck except that the ship was fitted with crusing turbines; the crusing and HP drums were both set at the after end of the main wheel; the IP and LP were simple reaction turbines; and the HP astern turbine was contained in the IP ahead drum at its forward end and the double-flow LP astern turbine was located between the LP turbine block.

Results of Dockyard Tests for Bismarck at a Displacement of 43,000 tonnes
Output (shp) No of boilers in use Shaft (rpm) Speed (knots) Fuel consumption (gm/hp/hr)
3 x 46,000 12 265 29 325
3 x 38,350 12 250   320
3 x 23,300 9 214   335
3 x 13,000 6 176   370
3 x 8,300 3 151   415
3 x 5,000 3 128   500
3 x 12,000 (astern)

Machinery data for Tirpitz
Output per shaft Shaft rpm Steam comsumption (t/hr)
22,500 98 11.5
5,400 130 21.5
11,000 166 39.0
17,500 194 59.0
25,750 220 86.5
34,150 241 114.0
42,750 258 143.3
46,000 265 165.0
16,000 (astern) 190 105.0