BANGLADESH POWER DEVELOPMENT BOARD TENDER ... - BPDB

15.1.4 RATINGThe rating of the crane shall be as follows:(1) Hoisting capacity(2) Span :Not less than 11.5 m(3) Lift :Not less than 10 m(4) Speeda. Hoisting speedMain hoist:5 m/minAuxiliary hoist :10 m/minb. Trolley travel :15m/minc. Bridge travel :15 m/min(5) Operating power sourceand terminal voltage :3 phase, 4 wire, 415 V AC, 50 Hz(6) Bridge travelling rail :37 kg/m(7) Space limit of the crane : Determined by the requirement of the plant.15.1.5 REQUIREMENT FOR CHARACTERISTICS(1) The brake for hoisting shall be capable of stopping and holding 120% ofthe rated capacity.(2) Deflection of bridge girder under load on main hook at the centre of thebridge girder shall not more than 1/500 of the span.(3) The crane shall be capable of raising, lowering, holding and transportingthe rated load without damage to, or excessive deflection of any craneparts.(4) Operation of HoistsEach hoist shall be controlled individually by the relevant controllerequipped in the operator's cab.15.1.6 REQUIREMENTS FOR MATERIALS(1) All materials used for the crane shall be new and conform to the latestrevision of ISO or approved equivalent standards.(2) Safety factors shall not be less than the following:-Shaft and axles : 5.0-Gears and pinions : 5.0-Wire rope : 6.0-Steel structure : 3.0Ghorasal 200 MW to 300 MW Gas Turbine Peaking Power Plant Project (Vol-2 of 3)132