Product Manual A

Operation
44 MTP4000-6000DZV/DZD Operating Manual 31609 A
Figure 16 - 6 Inch Pump Flow Chart
TORSIONAL VIBRATION
Torsional vibration is a periodic, reversing twist in a torque transmitting member such as a shaft. This twisting is
superimposed upon the rotation of the shaft. Any rotational system has at least one torsional natural frequency, the
frequency at which the shaft will twist back and forth if a torque is instantaneously applied then released. Internal
combustion engines deliver torque in a periodic or pulsing manner and consequently are very effective exciters of
torsional vibration. If an engine/pump set operates too near a critical speed, severe damage to the pump, engine or
related components can result. This is not indicative of a defect in any of the components; rather it is a characteristic
of any rotational system. For more information about torsional vibration, contact Generac Technical Service.
DIAPHRAGM PUMP SYSTEM
Some pumps are equipped with a diaphragm system. The system is a fully automatic self-priming, dry-prime vacuum
pump. It can rapidly prime and re-prime completely unattended. The pump utilizes a diaphragm, which creates
vacuum on the suction side of the pump, causing air to be displaced by water moving up the suction pipe. The water
approaches the ball valve and forces the ball valve closed, shutting off the air flow diaphragm pump. The pump is
then primed and operating at full flow.
Note: The diaphragm vacuum pump system also comes with run-dry capability, which allows indefinite dry running
of the seal.
1/15/00
VARIOUS
SINGLE VOLUTE MOUNTING CONFIG.: CC, VM, F, VF, EM, VC
Suction
Discharge
No. vanes
HP x .746 = KW
GPM x 3.785 = Liters/Minute
GPM x .227 = Cubic Meters/Hour
Inches x 25.4 = Millimeters
Feet x .305 = Meters
Solids Dia.
S
N
Impeller Dia.
Speed
Style
10.09"
ENCLOSED
3.0" 3300 6" 6" 2
5 FT.(1.5 M.)
7 FT.(2.1 M.) NPSH REQUIRED
10 FT.(3.0 M.)
15 FT.(4.6 M.)
20 FT.(6.1 M.)
25 FT.(7.6 M.)
80
75
75
70
70
60
10 HP
20 HP
30 HP
40 HP
50 HP
60 HP
1800 RPM
1500 RPM
1200 RPM
2100 RPM
50
180
160
140
120
20
40
30
20
10
0
METERS
TOTAL DYNAMIC HEAD
FEET
40
60
80
100
500 1000 1500 2000 25000 3000 3500
800
CUBIC METERS PER HOUR
700600500400300200100
CAPACITY
U.S. GALLONS PER MINUTE
4000
horsepower and/or performance adjustments. Other mounting styles or liquids may require coupled electric configuration with Cycloseal. Performances shown are for cool water, close-
R
01272