Tawanai Submersible Pumps
Model : T-SP-1.2-D24-1-250-60
T : Tawanai
SP : Submersible Pump
1.2 : Cubic meters per hour capacity
D24 : D24 for DC 24V or S : Single Phase 220V- 240V / 50HZ or T
for Three Phase 380V - 415V / 50HZ
1 : outlet size in inches
250 : Power in watts
60 : Max head in feet
Rs 24,050
Model : T-SP-13-D72-2-750-40
T : Tawanai
SP : Submersible Pump
13 : Cubic meters per hour capacity
D72 : D72 for DC 72V
2 : outlet size in inches
750 : Power in watts
40 : Max head in feet
Rs 65,000
Model : T-SP-14-D96-2-1500-70
T : Tawanai
SP : Submersible Pump
14 : Cubic meters per hour capacity
D96 : D96 for DC 96V
2 : outlet size in inches
1500 : Power in watts
70 : Max head in feet
Rs 67,925
Model : T-SP-16-D110-2-2200-100
T : Tawanai
SP : Submersible Pump
16 : Cubic meters per hour capacity
D110 : DC 110V
2 : outlet size in inches
2200 : Power in watts
100 : Max head in feet
Rs 78,560
Model : T-SP-18-D60-2-750-30
T : Tawanai
SP : Submersible Pump
18 : Cubic meters per hour capacity
D60 : DC 60V
2 : outlet size in inches
750 : Power in watts
30 : Max head in feet
Rs 65,650
Model : T-SP-18-D96-2-1500-45
T : Tawanai
SP : Submersible Pump
18 : Cubic meters per hour capacity
D96 : DC 96V
2 : outlet size in inches
1500 : Power in watts
45 : Max head in feet
Rs 69,160
Model : T-SP-21-D110-2-2200-55
T : Tawanai
SP : Submersible Pump
21 : Cubic meters per hour capacity
D110 : DC 110V
2 : outlet size in inches
2200 : Power in watts
55 : Max head in feet
Rs 80,275
Model : T-SP-28-D96-3-1500-30
T : Tawanai
SP : Submersible Pump
28 : Cubic meters per hour capacity
D96 : DC 96V
3 : outlet size in inches
1500 : Power in watts
30 : Max head in feet
Rs 78,000
Pump Model : T-SP-30-T-6-3-5A-7.5-5625
T : Tawanai
SP : Submersible Pump
30 : Cubic meters per hour capacity
S : Single Phase 220V- 240V / 50HZ or T for Three Phase 380V -
415V / 50HZ
6 : Pump Diameter 6 inches
3 : Impeller size 3 inches
5A : Motor Power in KW model
7.5 : Motor Power in HP
5625 : Watts
Performance graph : SP-30-5
Rs. 87,100
Warranty : 2 Years
Model : T-SP-30-T-6-3-7A-10-7500
T : Tawanai
SP : Submersible Pump
30 : Cubic meters per hour capacity
S : Single Phase 220V- 240V / 50HZ or T for Three Phase 380V -
415V / 50HZ
6 : Pump Diameter 6 inches
3 : Impeller size 3 inches
7A : Motor Power in KW model
10 : Motor Power in HP
7500 : Watts
Performance graph : SP-30-7
Rs. 101,920
Warranty : 2 Years
![http://www.fypumps.com/upfiles/images/5ead387d-12e9-4c58-a413-54c77bfda5620.jpg](Tawanai%20Sumbersible%20Pumps%20for%20Agriculture%2023%20jan%202017-5_files/5ead387d-12e9-4c58-a413-54c77bfda5620.jpg)
![https://sc01.alicdn.com/kf/HTB14JC8LXXXXXaDXXXXq6xXFXXXl/6SP-Grundfus-Submersible-Pump.jpg](Tawanai%20Sumbersible%20Pumps%20for%20Agriculture%2023%20jan%202017-5_files/6SP-Grundfus-Submersible-Pump.jpg)
Applications
For water supply from wells or reservoirs
For domestic use,for civil and industrial applications
For garden and irrigation
Operating conditions
Maxiumum fluid temperature up to +50ºC.
Maximum sand content : 0.25ï¼….
Maximum immersion : 100m.
Minimum well diameter : 6".
Motor and pump
Rewindable motor or Hermetically-Sealed motor
Single-phase : 220V- 240V /50HZ
Three-phase : 380V - 415V /50HZ
①Direct start(1 cable)
â‘¡Star-delta start (2 cables)
Equip with start control box or digital auto-control box
NEMA dimension standards
Curve tolerance according to ISO 9906
Options on request
Special mechanical seal
Other voltages or frequency 60 HZ
Warranty : 2 years
(according to our general sales conditions).
Components |
Material |
Delivery casing |
AISI 304 SS |
Suction lantern |
AISI 304 SS |
Diffuser |
AISI 304 SS |
Impeller |
AISI 304 SS |
Shaft |
AISI 304 SS |
Shaft coupling |
AISI 304 SS |
Wear ring |
Rubber |
Motor external casing |
AISI 304 SS |
Top chock |
â‘ Cast-iron ASTM NO.30 â‘¡ AISI 304 SS |
Bottom support |
â‘ Cast-iron ASTM NO.30 â‘¡ AISI 304 SS |
Seal |
NBR Graphite-SIC/TC |
Shaft |
AISI 304 SS-ASTM 5140 |
Trust bearing |
â‘ Graphite-Ceramic â‘¡ NSK |
Radial bearing |
â‘ Graphite-Ceramic â‘¡ NSK |
PUMP BASICS
How Centrifugal Pump
A centrifugal pump is of very simple design. The only
moving part is an impeller attached to a shaft that is driven by
the motor.
The two main parts of the pump are the impeller and diffuser.
The impeller can be made of bronze, stainless steel,
cast iron, polycarbonate, and a variety of other materials. A
diffuser or volute houses the impeller and captures the water
off the impeller.
Water enters the eye of the impeller and is thrown out
by centrifugal force. As water leaves the eye of the impeller a
low pressure area is created causing more liquid to flow toward
the inlet because of atmospheric pressure and centrifugal force.
Velocity is developed as the liquid flows through the impeller
while it is turning at high speeds on the shaft. The liquid
velocity is collected by the diffuser or volute and converted to
pressure by specially designed passageways that direct the flow
to discharge into the piping system; or, on to another impeller
stage for further increasing of pressure.
The head or pressure that a pump will develop is in
direct relation to the impeller diameter, the number of
impellers, the eye or inlet opening size, and how much velocity
is developed from the speed of the shaft rotation. Capacity is
determined by the exit width of the impeller. All of the these
factors affect the horsepower size of the motor to be used; the
more water to be pumped or pressure to be developed, the more
energy is needed.
A centrifugal pump is not positive acting. As the depth
to water increases, it pumps less and less water. Also, when it
pumps against increasing pressure it pumps less water. For these
reasons it is important to select a centrifugal pump that is
designed to do a particular pumping job. For higher pressures or
greater lifts, two or more impellers are commonly used; or, a
jet ejector is added to assist the impellers in raising the
pressure.
JET PUMPS
Jet Pumps are mounted above
ground and lift the water out of the ground through a suction
pipe. Jets are popular in areas with high water tables and warmer
climates. There are two categories of jet pumps and pump selection
varies depending on water level. Shallow well installations go
down to a water depth of about 25 feet. Deep wells are down 150
feet to water, where surface pumps are involved.
The jet pump is a centrifugal pump with one or more impeller and
diffuser with the addition of a jet ejector. A JET EJECTOR consists
of a matched nozzle and venturi. The nozzle receives water at high
pressure. As the water passes through the jet, water speed
(velocity) is greatly increased, but the pressure drops. This action
is the same as the squirting action you get with a garden hose as
when you start to close the nozzle. The greatly increased water
speed plus the low pressure around the nozzle tip, is what causes
suction to develop around the jet nozzle. Water around a jet nozzle
is drawn into the water stream and carried along with it.
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For a jet nozzle to be
effective it must be combined with a venturi. The
venturi changes the high-speed jet stream back to a
high-pressure for delivery to the centrifugal pump. The
jet and venturi are simple in appearance but they have
to be well engineered and carefully matched to be
efficient for various pumping conditions. The jet nozzle
and venturi are also known as ejectors/ejector kits.
On a shallow-well jet
pump the ejector kit (jet nozzle and venturi) is located
in the pump housing in front of the impeller.
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A portion of the suction water is
recirculated through the ejector with the rest going to the
pressure tank. With the ejector located on the suction side of the
pump, the suction is increased considerably. This enables a
centrifugal pump to increase its effective suction lift from about
20 feet to as much as 28 feet. But, the amount of water delivered
to the storage tank becomes less as the distance from the pump to
the water increases... more water has to be recirculated to
operate the ejector.
The difference between a
deep-well jet pump and a shallow-well jet pump is the location of
the ejector. The deep-well ejector is located in the well below
the water level. The deep-well ejector works in the same way as
the shallow-well ejector. Water is supplied to it under pressure
from the pump. The ejector then returns the water plus an
additional supply from the well, to a level where the centrifugal
pump can lift it the rest of the way by suction.
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A convertible jet pump
allows for shallow-well operation with the ejector mounted
on the end of the pump body. This type of pump can be
converted to a deep-well jet pump by installing the
ejector below the water level. This is of particular value
when you have a water level that is gradually lowering.
This will probably require a change of venturi to work
efficiently. Because jet pumps are centrifugal pumps, the
air handling characteristics are such that the pump should
be started with the pump and piping connections to the
water supply completely filled with water.
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With a shallow-well jet pump, the ejector is mounted
close to the pump impeller. With a deep well jet pump, the
ejector is usually mounted just above the water level in the
well, or else submerged below water level.
Centrifugal pumps, both the shallow-well and deep well
types have little or no ability to pump air. When starting, the
pump and suction line needs to have all of the air removed. An
air leak in the suction line will cause the pump to quit pumping
... or sometimes referred to as "losing its prime".
SUBMERSIBLE PUMP
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The submersible pump is a
centrifugal pump. Because all stages of the pump end
(wet end) and the motor are joined and submerged in the
water, it has a great advantage over other centrifugal
pumps. There is no need to recirculate or generate drive
water as with jet pumps, therefore, most of its energy
goes toward "pushing" the water rather than fighting
gravity and atmospheric pressure to draw water.
Virtually
all submersibles are "multi-stage" pumps. All of the
impellers of the multi-stage submersible pump are
mounted on a single shaft, and all rotate at the same
speed. Each impeller passes the water to the eye of the
next impeller through a diffuser. The diffuser is shaped
to slow down the flow of water and convert velocity to
pressure. Each impeller and matching diffuser is called
a stage. As many stages are used as necessary to push
the water out of the well at the required system
pressure and capacity. Each time water is pumped from
one impeller to the next, its pressure is increased.
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The pump and motor
assembly are lowered into the well by connecting piping to a
position below the water level. In this way the pump is always
filled with water (primed) and ready to pump. Because the motor
and pump are under water they operate more quietly than above
ground installations; and, pump freezing is not a concern.
We can stack as many
impellers as we need; however, we are limited to the horsepower
of the motor. We can have numerous pumps that have 1/2 HP
ratings - pumps that are capable of pumping different flows at
different pumping levels; they will, however, always be limited
to 1/2 HP. Another way to look at it is that a pump will always
operate somewhere along its design curve.
To get more flow, the exit width of
the impeller is increased and there will then be less pressure
(or head) that the pump will develop because there will be less
impellers on a given HP size pump. Remember, the pump will
always trade-off one for the other depending on the demand of
the system. If the system demands more than a particular pump
can produce, it will be necessary to go up in horsepower;
thereby, allowing us to stack more impellers or go to different
design pump with wider impellers.