Centrifugal Pumps Design and Application 2nd ed - Val S. Lobanoff, Robert R. Ross (Butterworth-Heinemann, 1992)
14-22, Flow of hydraulic recovery a HPRT Franzke).
278 Centrifugal Pumps: Design and Application age systems. Hydraulic turbines in power recovery applications may be used to drive a pump, compressor, or other types of rotating equipment either as a sole driver or as a helper driver in tandem with another driver such as an electric motor or steam turbine. Hydraulic turbines may also be used to drive electric generators. When the hydraulic turbine is used in tandem with another driver to drive a pump, consideration must be given to the available starting load requirements and operating load conditions. If the hydraulic turbine is able to bring the pump up to a speed with a reduced flow capacity through the pump, such as at pump minimum flow where the required HP is less, it is possible to use a reduced size electric motor or steam turbine driver to make up the horsepower difference required for normal pump operating conditions. This is not usually done, however, because plant operating conditions may cause an upset in the flow capacity to the hydraulic turbine with a resultant potential overload on the partial-sized drivers; the pump system would malfunction. The driver used in conjunction with the hydraulic turbine is usually foil sized to run the pump by itself and in addition to accommodate the low flow input horsepower requirements for the hydraulic turbine. On tandem-drive pump units, an over-running automatic free-wheeling clutch is often used that will permit the hydraulic turbine to be disengaged from the drive operation for simplified start-up procedures, system operating upsets, and maintenance. The use of the over-running clutch will also permit a lower flow capacity to the hydraulic turbine when it is operating at minimum flow conditions. The arrangements of the drive train components for tandem-drive units depend on the disassembly requirements for the components. When an electric motor is used in conjunction with a hydraulic turbine in tandem-drive arrangements, a double-extended motor shaft with the pump on one end and the turbine on the other end, is most common. An over-running clutch may be used between the motor and the hydraulic turbine when desired. The full-sized motor acts as an excellent speed governor for the hydraulic turbine. The motor may be essentially idle or it may even function as an electric generator with no adverse effects on the electric utility system should the RPM reach or slightly exceed synchronous speed. When a steam turbine is used in conjunction with a hydraulic turbine in tandem arrangements, the pump is typically installed between the steam turbine and the hydraulic turbine since the steam turbine is usually not available with a double extended shaft. A steam turbine is capable of acting as a good governor for speed regulation, provided the hydraulic turbine power rating does not significantly exceed that required by the pump (or other driven equipment). Power re-
- Page 242 and 243: Slurry Pumps 227 An approximate com
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- Page 258 and 259: Slurry Pumps 243 ing the pump speed
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278 <strong>Centrifugal</strong> <strong>Pumps</strong>: <strong>Design</strong> <strong>and</strong> <strong>Application</strong><br />
age systems. Hydraulic turbines in power recovery applications may be<br />
us<strong>ed</strong> to drive a pump, compressor, or other types of rotating equipment<br />
either as a sole driver or as a helper driver in t<strong>and</strong>em with another driver<br />
such as an electric motor or steam turbine. Hydraulic turbines may also<br />
be us<strong>ed</strong> to drive electric generators.<br />
When the hydraulic turbine is us<strong>ed</strong> in t<strong>and</strong>em with another driver to<br />
drive a pump, consideration must be given to the available starting load<br />
requirements <strong>and</strong> operating load conditions. If the hydraulic turbine is<br />
able to bring the pump up to a spe<strong>ed</strong> with a r<strong>ed</strong>uc<strong>ed</strong> flow capacity<br />
through the pump, such as at pump minimum flow where the requir<strong>ed</strong><br />
HP is less, it is possible to use a r<strong>ed</strong>uc<strong>ed</strong> size electric motor or steam<br />
turbine driver to make up the horsepower difference requir<strong>ed</strong> for normal<br />
pump operating conditions. This is not usually done, however, because<br />
plant operating conditions may cause an upset in the flow capacity to the<br />
hydraulic turbine with a resultant potential overload on the partial-siz<strong>ed</strong><br />
drivers; the pump system would malfunction. The driver us<strong>ed</strong> in conjunction<br />
with the hydraulic turbine is usually foil siz<strong>ed</strong> to run the pump<br />
by itself <strong>and</strong> in addition to accommodate the low flow input horsepower<br />
requirements for the hydraulic turbine.<br />
On t<strong>and</strong>em-drive pump units, an over-running automatic free-wheeling<br />
clutch is often us<strong>ed</strong> that will permit the hydraulic turbine to be disengag<strong>ed</strong><br />
from the drive operation for simplifi<strong>ed</strong> start-up proc<strong>ed</strong>ures, system<br />
operating upsets, <strong>and</strong> maintenance. The use of the over-running<br />
clutch will also permit a lower flow capacity to the hydraulic turbine<br />
when it is operating at minimum flow conditions.<br />
The arrangements of the drive train components for t<strong>and</strong>em-drive units<br />
depend on the disassembly requirements for the components.<br />
When an electric motor is us<strong>ed</strong> in conjunction with a hydraulic turbine<br />
in t<strong>and</strong>em-drive arrangements, a double-extend<strong>ed</strong> motor shaft with the<br />
pump on one end <strong>and</strong> the turbine on the other end, is most common. An<br />
over-running clutch may be us<strong>ed</strong> between the motor <strong>and</strong> the hydraulic<br />
turbine when desir<strong>ed</strong>. The full-siz<strong>ed</strong> motor acts as an excellent spe<strong>ed</strong><br />
governor for the hydraulic turbine. The motor may be essentially idle or<br />
it may even function as an electric generator with no adverse effects on<br />
the electric utility system should the RPM reach or slightly exce<strong>ed</strong> synchronous<br />
spe<strong>ed</strong>.<br />
When a steam turbine is us<strong>ed</strong> in conjunction with a hydraulic turbine in<br />
t<strong>and</strong>em arrangements, the pump is typically install<strong>ed</strong> between the steam<br />
turbine <strong>and</strong> the hydraulic turbine since the steam turbine is usually not<br />
available with a double extend<strong>ed</strong> shaft.<br />
A steam turbine is capable of acting as a good governor for spe<strong>ed</strong> regulation,<br />
provid<strong>ed</strong> the hydraulic turbine power rating does not significantly<br />
exce<strong>ed</strong> that requir<strong>ed</strong> by the pump (or other driven equipment). Power re-