Wärtsilä has developed the Midsize waterjet range to provide an easy to install solution for waterjet propulsion up to 4500 kW. The inlet duct is added to the supply and delivered pre-assembled on a skid for direct 'weld-in' or 'bolt-in' connection into the hull. The shaft line of the waterjet is aligned and all waterjet components are mounted on the skid. All auxiliary systems are mounted on the skid including the piping and electrical wiring.
All midsize waterjet sizes are available in a steering/reversing (SR) or booster (B) execution. The Midsize waterjet range consists of 5 sizes starting with the LJX 510 up to the LJX 810. To reduce the weight of the waterjet system, aluminium is chosen for the construction of several components. Components that play a critical role in the performance of the waterjet, like the stator bowl and the impeller, are constructed out of a high grade stainless steel like in our modular waterjet series.
Applications
Key benefits
Technical info
Applications
The characteristics of a waterjet make it a good propulsor for numerous applications.
Examples of such applications include:
Key benefits
Technical info
| Weight & dimensions table | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | A (mm) |
B (mm) |
C (mm) |
D (mm) |
E (mm) |
F (mm) |
Weight steering (kg) |
Weight booster (kg) |
Entrained water (l) |
| 510 | 1540 | 1065 | 2350 | 2975 | 1100 | 510 | 1400 | 1050 | 450 |
| 570 | 1730 | 1190 | 2520 | 3325 | 1200 | 570 | 1750 | 1300 | 600 |
| 640 | 1930 | 1335 | 2720 | 3735 | 1400 | 640 | 2400 | 1800 | 850 |
| 720 | 2170 | 1500 | 3000 | 4200 | 1400 | 720 | 2850 | 2250 | 1250 |
| 810 | 2440 | 1690 | 3220 | 4725 | 1400 | 810 | 3600 | 3000 | 1750 |
The graphs indicate the jet size required based on the relation between the engine power and the design speed of the vessel. For instance, a ship with four 1250 kW engines and a corresponding vessel speed of 33 knots will need four 510 midsize waterjets. A ship with a design speed of 40 knots at 1250 kW power can use 450 size waterjets. The correct jet size is thus indicated by the line above the intersection of the power and the corresponding vessel speed.
Please contact our global waterjets team for an optimized jet selection based on specific vessel design parameters and operating profile, or for details on waterjets above 50 knots or 30 000 kW. DXF/DWG format general arrangement drawings of the most often used sizes are available.
