34 



GRAPHICAL COMPARISON OF METER RATES 



The normal 100 per cent load factor use of a meter is taken 

 as that quantity which would pass running uninterruptedly so 

 that the head lost in passing is about 5 pounds for the smaller 

 meters of standard types and either somewhat more or somewhat 

 less for the larger ones, depending upon the type of meter. These 

 figures are much less than the manufacturers' ratings of the 

 meters, which are based on a loss of head of 25 pounds and are 

 too high for practical every-day use. 



The 100 per cent load quantities for meters of various sizes 

 on this basis are as follows: 



It is next assumed that under normal conditions of use some 

 average load factor, say 6 per cent, will be reached on all large 

 meters except those which are larger than otherwise required 

 because of fire service considerations and such meters are now, 

 excluded from consideration because rates charged for them 

 as service charges obviously depend upon fire requirements 

 and not on the ordinary delivery of water. In other words, 

 the calculation of meter rates for the purpose of plotting and 

 comparison is not intended to include payment for meters that 

 are unusually large from the standpoint of delivering water 

 and that are required for another purpose. 



For each size of meter this quantity of water corresponding 

 to a 6 per cent (or some other per cent) load factor is placed 

 beside the service charge and the amount of service charge for 



