 Two sets of steam turbines were ordered on 22 April 1913 from the Franco @-@ Russian Works in Saint Petersburg for the Admiralty @-@ built ships ; the Baltic Works built its own turbines and one pair for Navarin was ordered by the AG Vulcan Stettin in Germany , with some components ordered from abroad . The wing propeller shafts were powered by high @-@ pressure impulse @-@ reaction turbines , and the inboard shafts were powered by low @-@ pressure reaction @-@ type turbines . They produced a total of 66 @,@ 000 shaft horsepower ( 49 @,@ 000 kW ) and were designed to be overloaded to 90 @,@ 000 shp ( 67 @,@ 000 kW ) . The turbines were powered by 25 triangular Yarrow boilers with a working pressure of 17 kg / cm2 ( 1 @,@ 667 kPa ; 242 psi ) . The forward boilers were grouped into three compartments with three oil @-@ fired boilers in each compartment . The rear boilers were split into four compartments with each containing four coal @-@ fired boilers fitted with oil sprayers . Maximum speed was estimated at 26 @.@ 5 knots , although forcing the machinery would increase it to 28 @.@ 5 knots ( 52 @.@ 8 km / h ; 32 @.@ 8 mph ) . Coal capacity was 1 @,@ 974 long tons ( 2 @,@ 006 t ) and fuel oil capacity was 1 @,@ 904 long tons ( 1 @,@ 935 t ) , which gave an estimated range of 2 @,@ 280 nautical miles ( 4 @,@ 220 km ; 2 @,@ 620 mi ) at full speed . 
