OPERATING AND MAINTENANCE INSTRUCTIONS 751 



River in Cubic Feet per Second," calculated each day and con- 

 verted into " Available Capacity of River," which is shown in 

 kw.-hr.; the "Available Capacity of Power House," shown in 

 kw.-hr., and determined by calculating the capacity of the ma- 

 chines under the average head for twenty-four hours; the " Kw.- 

 hr. Lost," or the difference between what was actually generated 

 by the machines and what could have been secured from the river 

 during the same number of hours. 



Any important notes of operation are entered on the back 

 of each day's log sheet. These notes, together with certain rec- 

 ords for log sheets, are also entered each day in a log book kept 

 on the operator's desk at all times for reference purposes. Weather 

 conditions and temperatures are recorded four times daily, at 

 midnight, 6 A.M., noon, and 6 P.M. A rain guage is provided on 

 the roof of the station from which records of precipitation covering 

 each twenty-four hours are obtained. 



A record form of a large power system in the West is shown 

 in Fig. 408. 



Operating and Maintenance Instructions. Several of the 

 larger hydro-electric companies have developed very successful 

 systems of systematizing the operating details and properly 

 training the operating force, thus obtaining a considerable im- 

 provement over the methods ordinarily in use. A description of 

 the practice by one of the larger hydro-electric companies, as 

 given in the 1917 Report of the N.E.L.A. Committee on Prime 

 Movers, should therefore be of interest. 



Operating Instructions. The operation of the plant is covered 

 by instructions which express in writing not only what must 

 be done in the case of certain emergencies, but also describe how 

 the plant must be run under normal conditions. 



These " Permanent Instructions," as they are called, are 

 divided as follows : 



General Station Rules, etc. 



Safety Rules. 



Electrical Operation Normal and Abnormal. 



Hydraulic Operation Normal and Abnormal. 



Duties of Operating Men. 



Record and Forms. 



Electrical Maintenance. 



Hydraulic Maintenance. 



