Transactions of the Society of Naval Architects and Marine Engineers Volume 8 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...taken as the no-load current and consequently the motor outputs are too low by the amount of this gear friction, and the motor efficiencies correspondingly low. In the case of the turret turning gear the motor was entirely disconnected. The following is a list of the various cases: --Name. N0-load current from. ggaisrsrgg I Shafts run. ' Forward boat crane..... Table No. 20, 22 amp. 2 2 After boat crane....... Table No'. 28, 11.3 amp. 2 2 Turret turning......... Table No. 6, 37 amp. None None 13" hoist, taken same as after crane.........--I ' I V S" hoist............... Table No. 44, 4 amp. I 1 i Chain hoist........... Table N9. 57. 1 None I TESTS OF 50 K. W. GENERATING SETS. Description of A; _;)aratus.--The generating sets are designated as MP--6--5o--3I0, and are rated at 50 kilowatt, 80 volts, 625 amperes, 310 r. p. m. Object of T est.--The object of the tests made was first to demonstrate that each individual set would run satisfactorily for a continuous period of 48 hours, and, second, to determine the total steam consumption of the electric plant when running under various conditions of load and combinations of machines. /lletkoa' of Pr0eea'ure.--Three separate runs were made, each of 48 hours duration, the loads and sets used being as follows: --1. Two sets at full load. 2. Two sets at three-quarters load. 3. Three sets at half load. The load consisted of the ship's lights and ventilating motors and an adjustable water rheostat located on the upper deck. This water rheostat was manipulated by means of ropes running down the dynamo room trunk and terminating near the main generator switchboard. In this way the load on each set was kept constant during each run. During I2 hours of each 48-hour...