Steam jet liquid pumps are driven by water steam. The driving and suction medium are mixed by impulse exchange and the steam condenses during this process. The pressure of suction and discharge depends on the liquid temperature, the driving steam pressure and the jet pump design.
- Can be installed in any position.
- Freedom from maintenance
- Great reliability and safety of operation
- Long life
- Low cost
- No moving parts, therefore, no wear
- Simple erection and servicing
Applications are conveying/circulating of water, mainly in cases the water is to be warmed up at the same time. Also corrosive liquids, muddy liquids, sewage and suspensions are conveyed.
- Chemical and pharmaceutical industry
- Circulating and conveying aggressive and radioactive liquids in nuclear plants
- Elevating and conveying of caustic solutions and liquid chemicals such as lyes, acids, tanning liquors, lime, milk
- Elevating and conveying of slime liquids, such as effluent water, spent wash, mash, bilge water
- multi-stage steam jet vacuum packages
- Shipyards and the building industry
- Type A, for lower suction heights (up to 1 m) or for flooded inlet and large delivery heads (up to 5 barg)
- Type B, for larger suction heights (up to 8 m) and lower delivery heads (up to 1.5 barg)
- At liquid temperature of less than 20 °C, the performance of the steam jet pump will decrease.
- The temperature of the suction flow should be about 30 K lower than the boiling temperature corresponding to the suction pressure.
- The suction pipe should be installed absolutely tightly.
- Narrowly bended elbows or pipe reducing parts have to be avoided on all connections.
- Strainer to catch bigger particles out of the fluid are recommended.
- Dry saturated steam is best for the operation. A steam pipe insulation and a dewatering device should be provided for.
- The liquid to be conveyed must not be too hot, namely cooler than 60 °C
- Higher specific gravities of the liquid to be conveyed reduce the performance of the pumps.
In compliance with the varying demands, two different classes of standard steam jet liquid pumps are constructed:
- Cast iron
- Cast stainless steel
- Other materials on request
- Steel or stainless steel
- Temperature change resistant porcelain