198 POWER-HOUSE DESIGN 



Cooperation. A conference of all interested parties should be 

 arranged before starting the erection, and the various steps of 

 the erection discussed and settled. This is especially important 

 in the wheel and generator erection as the successful operation 

 depends almost entirely on the careful line-up of these units. 

 Arrangements should be made at this meeting for checking up the 

 line-up of the various parts, as this is nearly always a loophole 

 for future discussion. 



In case of trouble there is always the tendency to place the 

 blame on the other fellow's work. This can be absolutely avoided 

 by having ai] work checked by the wheel erector, the generator 

 erector and the resident engineer or his authorized representative 

 and all three signing a statement, in triplicate, each party keeping 

 his copy. This should read something as follows: " We agree 



that unit No. is on the longitudinal center line within 



mils. The cross center line within - - mils. On the proper 

 elevation within mils, and is level within mils." 



Where a two-piece shaft is used insert a clause, " The water 

 wheel coupling is true within mils, the rim is true within 

 mils. The generator coupling face is true within - - mils, the 

 rim within mils." Where it is impossible to test the coup- 

 lings on the ground this test can be made at the factories and a 

 statement furnished. These statements should be called for in 

 placing the orders for the apparatus. 



4. STARTING UP 



General Precautions. Before starting the machines for the 

 first time they should be carefully inspected and guarded to pre- 

 vent damage from tools or other foreign material being carelessly 

 or maliciously left where they will cause damage. The machines 

 should be blown out with compressed air to remove dust and dirt. 

 The bearings should be flushed with kerosene or oil, and when 

 self-lubricated, filled with clean oil of* the grade recommended by 

 the machine manufacturers. 



If the station is equipped with a central oiling system, all the 

 piping should be flushed with oil and the oil carefully filtered 

 before it is fed to the bearings. A temporary by-pass from the 

 feed pipe to the returns at the generator will be of great assistance 

 in cleaning and testing the oiling system. All piping should be 

 examined and tested for leaks. 



