Submersible Dewatering Pumps KRS Series

Submersible General-Purpose Dewatering Pumps

Tsurumi’s KRS series KRS SERIES of submersible heavy-duty pumps are designed and built to handle high volume pumping jobs. The series offers three types of pumps: a basic
(standard) type that is available in a wide product lineup, an energy-saving type of low output and low head that reduces power consumption, and a slurry dewatering type that is equipped with a high-chromium cast iron impeller and agitator.

Also offered are KRSU-series submersible pumps for bypassing sewage in sewer renewal work, which optionally come in a flange connection type for countermeasures to floods. Furthermore, after many years of research and application, Tsurumi has an optional seawater-resistant version that can draw and drain seawater over extended periods of time. All in all, KRS-series pumps are of multiple-purpose build and widely applicable.

SUBMERSIBLE DEWATERING PUMPS KRS SERIES

KRS-series pumps are available in a broad product lineup with discharge bore diameters of 80 to 250 mm, and motor outputs of 2.2 to 22 kW. All models integrate original technologies that Tsurumi has over the years researched and proven in the field, including Tsurumi’s original anti-wicking cable, dual inside mechanical seals with silicon carbide faces and Oil Lifter, etc.

Tsurumi pumps have and continue to play an active role in a wide range of applications, covering civil engineering and construction work that requires high reliability, large-scale construction projects such as tunnels, bridges and dams, and infrastructure for provisional drainage of sewage, simplified rainwater drainage for flood countermeasures, etc.

KRS

Drainage Pumps

KRS Drainage Pumps

KRS: Multi-purpose drainage pumps available in a wide product lineup

KRS

Energy-saving
Drainage Pumps

KRS (Energy-Saving) Energy-saving Drainage Pumps

KRS (Enegry-Saving): Drainage pumps of low output and low head that reduce power consumption

KRS

Slurry Pumps

KRS2-150

KRS (Slurry): Slurry pumps that deliver powerful agitation for discharging slurries laden with silt, earth, sand or other particulate

KRSU

Drainage Pumps

KRSU Submersible Pumps for Sewage Bypass

KRSU: Submersible pump for provisional sewage bypass between manholes

Selection Table

Motor Output 2.2-3.7 4-5.5 6-7.5 09-11 15-18.5 22
kW kW kW kW kW kW
KRS 3” 80mm            
4” 100mm            
6” 150mm            
8” 200mm            
10” 250mm            
KRS-Enegry-Saving- 4” 100mm            
6” 150mm            
8” 200mm            
KRS -Slurry- 3” 80mm            
4” 100mm            
6” 150mm            
8” 200mm            
KRSU 6” 150mm            

Flange Connection Type Pump for Flood Countermeasures

Tsurumi offers pumps of flange connection type as countermeasures to river flooding and submerged roads caused by large-scale natural disasters (hurricanes, squalls, local downpours, etc.), which have occurred more frequently in recent years.
By using the flange connection type, the KRS-series pumps can also serve as simplified rainwater drainage pumps. Since the flange connection type can be easily installed and removed, and features the sound reliability, durability and maintainability demanded of construction work, the pump can make a contribution as a countermeasure to floods.

Options

Tsurumi’s pumps can be combined with a seawater-resistant kit (optional) that adds a “galvanic anode” and “seawater-resistant special cast iron impeller,” and enables about two years of service.

Tsurumi’s pumps are applicable to high temperature liquids of up to 90°C. Pumps of the standard specification can discharge liquids of up to 40°C. However, there are many fields that need to discharge higher temperature liquids, e.g., discharging industrial water from a power plant or ironworks, or discharging hot spring water from a mine in a volcanic zone.

Tsurumi’s pumps can be manufactured to between 380 – 1000V ratings that are often required for mining applications. The pumps meet mining safety standards as they come with screened cables and motors with built-in diodes for ground-fault checks.

Top Discharge, Side Flow Design

This design assures efficient motor cooling even if the pump runs with its motor exposed to air, and also allows the overall diameter of the pump to be reduced for installation in confined spaces.

* Model KRS1022 is a top discharge, flow-thru design. It provides maximum motor cooling efficiency allowing continuous operation at low water levels and extended dry-run capability.

Prevents water incursion due to capillary action should the cable sheath be damaged or the end of cable submerged. Also prevents moist air from infiltrating the motor housing and condensation from forming inside the housing due to temperature differences between the housing and outside air.

Prevents unexpected water incursion that can occur if the cable is damaged, by protecting the cable against the tugging and rough handling found at construction sites.

Directly cuts the motor circuit if excessive heat builds up or overcurrent occurs in the motor.

Isolated in the oil chamber where a clean, non-corrosive and abrasion-free lubricating environment is maintained.
Compared with the water-cooled outside mechanical seal, it reduces the risk of failure caused by dry-heating and
adhering matter. The silicon carbide provides 5 times higher corrosion, wear and heat resistance than the tungsten
carbide. Rubber parts of the upper and lower fixing rings are made of NBR or FPM (FKM), which provides higher
resistance to heat and chemicals.

Provides lubrication and cooling of the seal faces down to 1/3 of normal oil level, thus maintaining a stable shaft
sealing effect and prolonging seal life longer. The Oil Lifter is Tsurumi original design.

Used as a “Dust Seal”, it protects the mechanical seal from abrasive particles.

Ductile Cast Iron Semi-vortex Impeller (KRSU)
Resists wear caused by abrasive particles and enables the pump to maintain its original performance for an
extended period of time.

Made of high-chromium cast iron ensuring highest durability. Even if the performance drops due to wearing out of the
impeller and/or suction plate, it can be improved by simply replacing the suction plate.
* KRS-200 has an adjustable suction plate

Consists of a shaft-mounted agitator and a dedicated strainer. The agitator made of high-chromium cast iron resists
wear caused by abrasive particles, and it suspends solids to assist in pumping sediments in combination with the
strainer.

KRS

Multi-purpose drainage pumps available in a wide product lineup
The KRS-series is a submersible three-phase cast iron high volume heavy-duty drainage pump. The cast
iron body, combined with the low speed motor, presents extra durability for use in the most demanding
conditions. The top discharge, side flow design assures efficient motor cooling even when it operates with its
motor exposed to air.*
* Model KRS1022 is a top discharge, flow-thru design. It provides maximum motor cooling efficiency allowing continuous operation at
low water levels and extended dry-run capability

KRS Drainage Pumps
KRS2-A3
KRS1022
KRS1022
Discharge Bore Model 50/60Hz Motor Output   Starting Method Solids Passage Dimensions L x H Dry Weight*2 Cable Length
mm kW Phase mm mm kg m
80 KRS2-C3/A3 2.2 Three D.O.L.*1 12 340 x 620 72 8
80 KRS2-D3/B3 3.7 D.O.L.*1 12 365 x 705 91 8
100 KRS2-C4/A4 3.7 D.O.L.*1 12 350 x 720 88 8
100 KRS2-D4/B4 5.5 D.O.L.*1 12 365 x 710 98 8
150 KRS2-C6/A6 7.5 D.O.L.*1 20 145 x 767 130 8
150 KRS2-D6/B6 11 D.O.L.*1 20 434 x 813 158 8
200 KRS2-8S 11 D.O.L.*1 30 473 x 933 174 8
200 KRS815 15 D.O.L.*1 25 481 x 1069 240 8
200 KRS819 18.5 D.O.L.*1 25 576 x 1241 360 10
200 KRS822 22 D.O.L.*1 25 576 x 1241 380 10
200 KRS822L 22 D.O.L.*1 25 576 x 1241 380 10
250 KRS1022 22 D.O.L.*1 25 525 x 1419 390 10

*1 Star-Delta available upon request
*2 Weights excluding cable

Performance Curves

KRS (Energy-Saving)

Drainage pumps of low output and low head that reduce power consumption
The KRS-series of energy-saving type is a submersible three-phase cast iron high volume heavy-duty
drainage pump. It consumes less energy than the standard KRS-series at lower head applications. The cast
iron body, combined with the low speed motor, presents extra durability for use in the most demanding
conditions. The top discharge, side flow design assures efficient motor cooling even when it operates with its
motor exposed to air.

KRS2-69
KRS2-69
KRS (Energy-Saving) Energy-saving Drainage Pumps
KRS2-89

Performance Curves

Discharge Bore Model Motor Output Phase Starting Method Solids Passage Dimensions L x H Dry Weight*2 Cable Length
mm kW mm mm kg m
100 KRS-43 3   D.O.L.*1 12 378 x 723 95 8
150 KRS-63 3   D.O.L.*1 15 384 x 866 97 8
150 KRS-65.5 5.5   D.O.L.*1 20 425 x 790 118 8
150 KRS2-69 9   D.O.L.*1 20 490 x 812 155 8
200 KRS-85.5 5.5   D.O.L.*1 20 446 x 941 126 8
200 KRS2-89 9 Three D.O.L.*1 30 473 x 933 175 8

KRS (Slurry)

Slurry pumps that deliver powerful agitation for
discharging slurries laden with silt, earth, sand or other particulate
The KRS-series of slurry-handling type is a submersible three-phase cast iron heavy-duty slurry pump. It is
equipped with a high-chromium cast iron agitator that assists smooth suction of the settled matters. The
other wear parts such as the impeller and the suction plate are also made of high-chromium cast iron for
extra durability. The top discharge, side flow design assures efficient motor cooling even when it operates
with its motor exposed to air.

KRS2-80
KRS2-80
KRS2-150
KRS2-150

Performance Curves

Discharge Bore Model Motor Output Phase Starting Method Solids Passage Dimensions L x H Dry Weight*2 Cable Length
mm kW mm mm kg m
80 KRS2-80 4   D.O.L.*1 30 349 x 800 105 8
100 KRS2-100 6   D.O.L.*1 30 415 x 835 143 8
150 KRS2-150 9   D.O.L.*1 30 433 x 898 170 8
200 KRS-200 18 Three D.O.L.*1 30 576 x 1181 380 10

KRSU

Submersible pump for provisional sewage bypass between manholes
The KRSU822 pump of submersible three-phase cast iron heavy-duty pump is designed and built specifically
for temporarily bypassing drainage in sewer construction work. With a maximum head of 26.5 m, maximum
capacity of 5.7 m 3 /min, and space-saving design of 546 mm in diameter, this pump plays an active role in
drainage in the deep confined space of a manhole.
Also, with its semi-vortex structure, this pump provides a large solids passage of 56 mm in diameter, which
prevents any clogging of foreign matter. The top discharge, side flow design assures efficient motor cooling
even when operating with the motor exposed to air.

KRSU Submersible Pumps for Sewage Bypass
KRSU822

Performance Curves

Discharge Bore Model 50/60Hz Motor Output   Starting Method Solids Passage Dimensions L x H Dry Weight*2 Cable Length
mm kW Phase mm mm kg m
200 KRSU822 22 Three D.O.L.*1 56 546 x 1486 430 10

Submersible Sewer Bypass Pumping

Since sewage piping suffers from aging-related deterioration and can be damaged by earthquakes, sewage piping requires repairs and replacing at regular intervals. In sewage piping repair work, consideration should be given to area residents inconvenienced by the repair work, and additionally to work efficiency and the safety and health of workers who handle inflow sewage. For this purpose, provisional draining that temporarily bypasses sewage via a pump is extremely effective.

As a pump for bypassing sewage between manholes in sewage piping renewal work, Tsurumi offers the KRSU822 pump of submersible sewer bypass pump. This pump features a maximum head of 26.5 m, a maximum capacity of 5.7 m 3 /min, and a compact space-saving design of just 546 mm in diameter. Normally,
with engine pumps, it is difficult to suck up fluid from a depth of 7 m or more, but the KRSU submersible pump can fit in the deep limited confines of a manhole and there play an active role in draining the manhole.
In addition, with its semi-vortex structure, this pump provides a large solids passage of 56 mm in diameter, which prevents clogging of foreign matter. In fact, it is particularly effective towards preventing clogging of fibrous solids in the impeller, which is the biggest problem in draining sewage. The stand has a bottom plate structure so that the pump can stably stand by itself even when the pump is placed on earth, sand or sludge. The KRSU822 has a top discharge, side flow structure that effectively cools the motor even when the pump runs with the motor exposed to air. Thus, the KRSU822 is highly suited as a bypass pump

KRS   KRS KRS (Energy-Saving) KRS (Slurry) KRSU
KRS 2-C3/A3 KRS 2-D3/B3 KRS 2-C4/A4 KRS 2-D4/B4 KRS 2-C6/A6 KRS 2-D6/B6 KRS 2-8S KRS 815 KRS 819 KRS 822 KRS 822L   KRS 1022 KRS 43 KRS 63 KRS 65.5 KRS 2-69 KRS 85.5 KRS 2-89 KRS 2-80 KRS 2-100 KRS 2-150 KRS 200 KRSU 822
PUMP Discharge Bore mm       200                  
80 100 150 250 100 150 200 80 100 150 200
        JIS
      10kg/cm2 Flange
Discharge Connection Hose Coupling Hose Coupling  
Solids Passage mm 12 20 30 25   25 12 15 20 30 56
  Semi-open   Closed Semi-open Semi- vortex
 
Impeller Ductile Cast Iron   Ductile Cast Iron High-chromium Cast Iron Gray Cast Iron
Suction Cover Gray Cast Iron   Gray Cast Iron
Suction Plate
 
 
 
High-chromium Cast Iron
 
Oil Seal Nitrile Butadiene Rubber   Nitrile Butadiene Rubber
Casing Gray Cast Iron   Gray Cast Iron
  Dual Inside Mechanical Seals (with Oil Lifter)   Dual Inside Mechanical Seals (with Oil Lifter)
 
Shaft Seal Silicon Carbide   Silicon Carbide
Agitator
 
 
 
High-chromium Cast Iron
 
MOTOR Type Continuous-duty Rated, Dry-type Induction Motor   Continuous-duty Rated, Dry-type Induction Motor
Output kW 2.2 3.7 5.5 7.5 11 15 18.5 22   22 3 5.5 9 5.5 9 4 6 9 18 22
Phase Three   Three
Pole 4   4
Insulation         F E B E B E B F
E B F
Starting Method D.O.L.*2   D.O.L.*2
Motor Protector (built-in) CTP   CTP
ml 1200 1850 2300 3200 6500   4000 1440 1960 2300 1960 2300 1850 2300 6500
Lubricant Turbine Oil (ISO VG32)   Turbine Oil (ISO VG32)
Frame Gray Cast Iron   Gray Cast Iron
Shaft 420 Stainless Steel   420 Stainless Steel
m 8 10   10 8 10
Cable Chloroprene Rubber   Chloroprene Rubber
Dry Weight*1 kg 72 91 88 98 130 158 174 240 360 380   390 95 97 118 155 126 175 105 143 170 380 430