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.
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.
Drainage Pumps
KRS: Multi-purpose drainage pumps available in a wide product lineup
Energy-saving
Drainage Pumps
KRS (Enegry-Saving): Drainage pumps of low output and low head that reduce power consumption
Slurry Pumps
KRS (Slurry): Slurry pumps that deliver powerful agitation for discharging slurries laden with silt, earth, sand or other particulate
Drainage Pumps
KRSU: Submersible pump for provisional sewage bypass between manholes
| 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 | ||||||
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.
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.
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.
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
| 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
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.
| 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 |
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.
| 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 |
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.
| 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 |
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 | 
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High-chromium Cast Iron | 
|
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| 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 | 
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High-chromium Cast Iron | 
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| 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 | |||||||||||||||||||||
