Submersible High Head Drainage Pumps LH Series are submersible heavy-duty pumps specialized for highhead. These pumps are available in a wide lineup, offering 3 to 110kW motor output and 18 to 230m maximum head. The LH/LH-W series has played an active role in various fields,from small/medium-scale civil engineering and construction work that requires high reliability, to large-scale projects for constructing tunnels, bridges and dams. And,because of their slim body, these pumps have proven to be particularly useful for deep well dewatering and mine pit drainage where required to work in limited space.
So that they can stand up to harsh environment, these pumps have the impeller and mouth ring made of high-chromium cast iron that provides high wear resistance. The pump is equipped with seal pressure relief ports* that release pump pressure applied to the mechanical seal. Furthermore, to endure even extended operation at low water level, these pumps feature flow-thru design that forcibly cools down the motor.
Tsurumi submersible pumps integrate original technologies that Tsurumi has researched and proven in the field over many years, such as anti-wicking cable, motor protector, dual inside mechanical seals with silicone carbide faces and Oil Lifter, etc. With these features, Tsurumi pumps provide excellent reliability and durability that enables continuous duty for long periods of time. Available as optional specifications are an original “seawater-resistant pump” developed over many years by Tsurumi to enable seawater intake/drainage for long periods of time, and an “all stainless steel pump” using 316 stainless steel for mining markets. Tsurumi submersible pumps integrate original technologies that Tsurumi has researched and proven in the field over many years, such as anti-wicking cable, motor protector, dual inside mechanical seals with silicone carbide faces and Oil Lifter, etc. With these features, Tsurumi pumps provide excellent reliability and durability that enables continuous duty for long periods of time.
Available as optional specifications are an original “seawater-resistant pump” developed over many years by Tsurumi to enable seawater intake/drainage for long periods of time, and an “all stainless steel pump” using 316 stainless steel for mining markets.
(Galvanic anode & Special impeller)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. (The service period depends on operating conditions.) For details, refer to the Seawater-Resistant Pumps catalog [IB115].
(Max. 90℃) 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.
(Max. 1000V) Tsurumi's pumps can be fabricated to 690V or 1000V ratings that are often required for mining applications. The pumps meet mining safety standards as they come with shielded cables and motors with built-in diodes for ground-fault checks.
(Max. 90℃) All of the parts of Tsurumi’s pumps that contact fluid, including the impeller, pump casing, motor frame, outer cover, strainer stand, and flange, can be made in 316 stainless steel. Tsurumi’s all stainless steel pump can handle corrosive fluids generated in mines or quarries, and fluids of low pH value. For details, refer to the Corrosion-Resistant Pumps catalog
| Discharge Bore |
2" 50mm |
3" 80mm |
4" 100mm |
6" 150mm |
8" 200mm |
|
|---|---|---|---|---|---|---|
| LH (Single Impeller) |
3kW | ★ | ||||
| 15kW | ||||||
| 19kW | ||||||
| 22kW | ||||||
| 30kW | ||||||
| 37kW | ||||||
| 45kW | ||||||
| 55kW | ||||||
| 75kW | ||||||
| 90kW | ||||||
| 110kW | ||||||
| Discharge Bore |
2" 50mm |
3" 80mm |
4" 100mm |
6" 150mm |
8" 200mm |
|
|---|---|---|---|---|---|---|
| LH-W (Dual Impellers) |
3kW | ★ | ||||
| 5.5kW | ★ | |||||
| 11kW | ★ | |||||
| 22kW | ★ | |||||
| 30kW | ★ | |||||
| 110kW | ||||||
★ Tandem operation model: Same model pumps are connected in series, to deliver higher head.
This design provides maximum motor cooling efficiency allowing continuous operation at low water levels and extended dry-run capability, and also allows the shape of the pump to be cylindrical and slim for installation in a well casing for deep well dewatering.
1.Anti-wicking Cable Entry
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.
2.Cable Clip
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.
3.Motor Protector
Circle Thermal Protector (22kW and below)
Directly cuts the motor circuit if excessive heat builds up or overcurrent occurs in the motor.
Miniature Thermal Protectors (30kW and above)
React to excessive heat caused by dry-running. The bimetal strip opens to cause the control panel to shut the power supply.
4.Shaft
Quenching treatment is applied to parts that contact particles in pumped fluids and whose mechanical seal may wear out, to enhance surface hardness and extend shaft service life.
5.Dual Inside Mechanical Seals with Silicon Carbide Faces
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.
6.Oil Lifter
rovides 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 desigh.
7.Leakage Sensor (55kW and above)
Detects flooding into the oil chamber that may occur in a worst case scenario. When flooding is detected, signals are sent to operate the indicator lamps through the external control panel.
8.Seal Pressure Relief Ports (excluding 3kW)
Protect the mechanical seal from pump pressure. They also protect the seal face by discharging wear particles.
9.Labyrinth Ring (LH 15kW and above & LH-W)
Equipped to provide a better countermeasure against wear caused by high pressure generated in the casing and improve the maintainability.
10.High-chromium Cast Iron Impeller & Mouth Ring
Resists wear caused by abrasive particles and enables the pump to maintain its original performance for an extended period of time.
LH: Single impeller LH-W: Dual impellers
11.Galvanic Anodes (excluding 3kW)
Protect the pump against corrosive potential generated during the drainage of wastewater.
