Aug. 1, 1925 
Tests of Deep-WeTl Turbine Pumps 
229 
form with local operating conditions. Each pump was carefully 
installed, and all joints and connections were inspected before the 
tests started to insure efficient operation. The weir crest was checked 
for level, and the zero of the hook gauge was made to conform with 
the elevation of the crest of the weir. 
Two men, observer and recorder, made the tests. Two sets of 
readings were taken separately for each observed head and these 
were averaged, unless there appeared to be too great a difference 
between readings, in which case a third set of readings was taken and 
the two between which there was the least difference were averaged. 
The variations in head were controlled by throttling the discharge 
with a gate valve. Each 
set of tests started with the 
valve closed. For each suc¬ 
ceeding run it was opened 
enough to give a decrement 
of 2 feet in head. 
The cycle of readings 
taken by the observer was: 
Voltage, kilowatts, speed 
of motor, speed of pump, 
height of water on weir crest 
as indicated by hook gauge, 
and check reading on volt¬ 
meter and wattmeter. The 
readings taken by the re¬ 
corder were: Vacuum head 
and pressure head, the lat¬ 
ter being made at the time 
the wattmeter was read by 
the observer. 
TEST DATA 
The test data for each 
pump consist of tables giv¬ 
ing complete results of the 
various average speeds and 
performance curves,includ¬ 
ing capacity-head curves, iso-efficiencv curves, iso-brake-horsepower 
curves, and logarithmic curves showing the velocity-head difference 
between suction and discharge. 
The tables give the speeds of the pump for varying capacities in 
gallons per minute and the corresponding pressure head, suction head, 
static head, velocity head, total head, brake horsepower, water 
horsepower, and efficiency. The pressure head and suction head were 
measured directly with mercury manometers. The static head was 
measured with a surveyor’s level, being the distance between the 
taps for pressure and vacuum, respectively. Brake horsepower was 
measured directlv by an indicating wattmeter and corrected for 
motor efficiency from the motor-efficiency curve. Water horsepower 
and efficiency were computed from the foregoing data. 
Fig. 2.—Prony brake test of motor 
